64 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



with the nerve-fibres that find their way in canals between the tegmentum 

 and articulamentum of the shell into the girdle tissues. 



He next showed various forms of Stenochiton, a genus that has for its 

 host various forms of sea grasses, Posidonia, Cymodocea, etc. One form lives 

 in the brown sheath of the long ribbon leaves, buried several inches in the 

 sand. The habits of the other forms were also alluded to. 



While all the known species have been described from the State of South 

 Australia and up to the present only recorded from three Australian States, 

 Mr. Ashby expressed the opinion that ultimately they will be discovered in 

 all the other States, and, in fact, Stenochitons or some kindred form will be 

 found throughout the world, wherever these marine plants, known as sea 

 grasses occur. He showed that until the habits of the Stenochitons were 

 understood most of the recognized species were either quite unknown or 

 considered extremely rare. 



3. A list of the Nudibrancliiate Mollusca recorded from the 

 Pacific Coast of North America, with a note on their Distribution. 

 By Chas. H. O'Donoghue, D.Sc, F.Z.S., and Elsie O'Donoghue, B.A. 

 (communicated by Gr. C. Eobson, M.A., F.Z.S.). 



4. Note on Trochus flavidus, T. pallidulus, and T. Jlammiger of 

 Dunker. By J. E. Le B. Tomlin, M.A., F.E.S. 



The following exhibits were made : — 



By Col. Peile and Mr. Kennard. Specimens illustrating Col. Peile's 

 paper. 



By Mr. Ashby. A very complete collection of the Australian 

 Polyplacophora illustrating his paper. 



By Mr. Iredale. An unique edition of Lammarck's " Animaux 

 sans vertebres ". 



By Mr. Spence. Land shells from South Africa, including Achatina 

 and species of Ceras. 



By Dr. Boycott. Abnormal specimens of Limncea fereger, one of 

 which is of planorboid shape. 



