No description available.

No description available.

Thesis (Ph. D.)--Oregon State University, 1990. / Typescript (photocopy). Includes bibliography (leaves 178-190). Also available via the World Wide Web.

Thesis (Ph.D.)--Murdoch University, 2003. / Thesis submitted to the Division of Science and Engineering. Bibliography: leaves 502-528.

Thesis (Ph.D.)--Murdoch University, 2007. / Thesis submitted to the Division of Science and Engineering. Includes bibliographical references (leaves 192-195).

Thesis (Ph. D.)--University of Hong Kong, 1997. / Includes bibliographical references (leaf 158-176).

The chiton Mopalia muscosa ranges from the open rocky coast to the bay environment, whereas the related chiton Mopalia lignosa is restricted to the outer rocky coast. The mantle cavity currents, anatomy and histology were investigated. Mucous gland cells of Mopalia muscosa are goblet type secretory cells. Their apparent ability to deliver their secretion rapidly together with having a short restitution period probably accounts for Mopalia muscosa having success at invading the bay environment. The mucous glands of Mopalia lignosa consist primarily of cells with medium to coarse secretory granules. These cells apparently are not as efficient at handling suspended sediments thereby limiting in part the range of Mopalia lignosa. The distribution of cilia in the mantle cavity is correlated with secretory cell type. Mantle cavity and gill anatomy along with their currents are similar in the two chitons.

The large gumboot chiton, Cryptochiton stelleri, (Middendorf, 1846) annually undergoes a reproductive cycle terminated by spawning in the spring. Cryptochiton stelleri is one of the marine invertebrates which possess carotenoid prognosis. Cryptochiton acquired its carotenoid moiety from the algae upon which it feeds. Following digestion carotenoids are transported to various sites in the body. The mechanisms and routes of this transport, as well as the eventual fate of the carotenoids in nutrition, are unknown. Perhaps storage in the animal occurs because of an inability to eliminate the carotenoids. On the other hand, the presence of carotenoids in the gonads would suggest a relationship to reproduction. Especially interesting in the appearance of the green pigment in the egg during maturation. The investigation of any of the foregoing considerations requires convenient methods of analysis. One of the first steps of analysis in the discovery of an extracting solvent. It is the purpose of this paper to describe several experiments carried out to find extracting solvents for the removal of the green pigment from the eggs of Cryptochiton, as well as some preliminary investigation into the pigment’s nature. Also described are several experiments relating the studies upon the carotenoids found in the gonads of both sexes of Cryptochiton.

Adult specimens of Katharina tunicata (mean weight = 10.23 grams) and Mopalia hindsii (mean weight = 10.90 grams) were tested for osmotic stress tolerance and oxygen consumption rates in a series of salinities (120%, 100%, 80%, 60%, and 40% seawater) at 11°C and 16L:8D photoperiod. K. tunicata and M. hindsii displayed similar trends in percent body weight variation and volume regulatory responses to osmotic stress. However, K. tunicata experienced a significantly higher percent body weight increase than did M. hindsii in response to hypo-osmotic conditions (80%, 60%, and 40% seawater). The mean rates of oxygen consumption per salinity for the two species were not significantly different. Both species, however, showed reduced oxygen consumption rates and significantly increased weight gain in 40% seawater. SEM comparisons of radulae, ctenidia, and shape of the pallial groove revealed no significant differences between the species relevant to differences observed in habitat selection.