The vasa efferentia and the ductus epididymis are tubules which connect the testis with the vas deferens. The vasa efferentia are formed in the embryo from some of the mesonephric nephrons or Wolffian tubules. These join the Wolffian duct at their distal ends, and during prenatal development they establish a connection with the rete testis. [...]

The ability of Sabellid worms to withdraw rapidly into their tubes has caused widespread comment. The withdrawal can be triggered off by a variety of stimuli: sudden reduction in light intensity; shock waves in the water; tactile stimuli. The withdrawal in response to a reduction in light intensity is usually referred to as the "Shadow reflex". Similar reactions are present in other closely related Polychaete families. The rapidity of the withdrawal is made possible by the rapid transmission of nerve impulses from the receptive regions of the body to the contracting muscles by the giant axons present in the central nervous system.

Numerous attempts have been made to classify the various types of lentic environments. None of the systems of classifying lakes, whether based on dissolved oxygen, thermal conditions, chironomid larvae or numerous other criteria, has been wholly successful, nor are they likely to be until lakes in the more inaccessable regions of the world are investigated. Welch (1941) wrote, "In fact, I am disposed to view most of them as premature and worthy of little attention." Though the volume of limnological knowledge has increased greatly since then, attempts at classification are still largely premature.

The ringed seal, Phoca hispida, is a widely ranging hair seal inhabiting arctic and subarctic waters (as defined by Dunbar, 1951) of the entire northern hemisphere. In North American continental waters it is found from the Gulf of St. Lawrence (rarely; Fisher, 1950) across the Canadian arctic to the Bering Sea. No overall biological study has been made of this seal in North America. Much of our knowledge comes from Eskimo observations and much of what is presumed from these sources has not been checked by sound observation and collection.

Size, color phases, molar tooth complexity, and post-palatal margin variations were studied as individual characters in C. gapperi in the Quebec Peninsula. These were found to have discordant patterns of distribution. A significant gradient in size increase was found from the neck to the eastern and northern portions of the Peninsula. Brown-back and the fifth angle showed a general increase northward in frequency within the confines of the Peninsula compared with contiguous regions. Local variations within the study area occurred.

The object of this work is to present data relating to the biology of the arctic char (Salvelinus alpinus (L.) of Nettilling Lake, Baffin Island, District of Franklin. The data presented wr.e collected by the author during the summer of 1956 when the first limnological investigation of the lake was undertaken. Observations were made on the habits and distribution of the char; the length, weight, sex, stomach contents, and condition of the gonads were recorded; otoliths for age determinations, parasites, egg samples, and whole specimens were brought back for further analysis.

The decapod fauna of Ungava Bay (17 species, 3,000 specimens collected) is shown to be similar to that of the shallow water areas of West Greenland. Four species are reported for the first time from Ungava Bay: Sergestes arcticus and Pasiphaea tarda, ordinarily from deeper and warmer water, and Eualus macilentus and Sabinea septemcarinata. Systematics of each species is treated under occurrence, world distribution and taxonomy. Lengths of most species of shrimp showed that a greater size was reached in females than in males. Maturities with respect to size when first mature, egg size and times of hatching and spawning are discussed.

The main object of this work is to build up as detailed and accurate a picture as possible of the normal behaviour of eider ducklings (Somateria mollissima) under natural conditions. Such a description has been called an ‘ethogram’ (1), and utilises the methods and teaching of contemporary ethologists such as Tinbergen(2), Thorpe (3), and Lorenz (4). Secondly, in pursuit of the primary aim, it is hoped to show the validity of what may be called 'the naturalistic approach'.

Atlantic salmon (Salmo salar Linn.) have been known to inhabit the rivers flowing north into Ungava Bay for many years. In spite of their importance no biological investigation of the populations has previously been carried out. These populations are of particular interest as it is here that the salmon reaches the most northerly extent of its range in eastern Canada. [...]

The regulation of any fishery depends for its direction upon the knowledge of the biology of the fish involved. As the haddock has been one of the more important marine food fishes even before marine biological investigation was initiated in the fishing areas of the northwest Atlantic, it has periodically received attention from biologists working in these areas. Since the end of World War II with the advent and use of more efficient aids and methods for catching groundfish, the problem of regulation has become more acute.