THE NAUTILUS. 55 



Type locality: Crystal Brook, Long Island, N. Y. 



Records: Crystal Brook and Mt. Sinai, Long Island, N. Y. 



Habitat: In salt or brackish water, " at low tide in shore of bay fed 

 by springs" (Crystal Brook) ; in ice-cold spring (Mt. Sinai.) 



Remarks: This peculiar Lymnasa has been somewhat of a puzzle 

 for a long time. It was at first thought to be a variety of L. cata- 

 scopium pinguis but it differs from that form in its thinner shell, more 

 globose form, more dome-shaped spire and particularly in its triangu- 

 lar, smooth, reflected inner lip and distinct umbilical chink. The 

 form of the shell and of the inner lip resembles the bulimoides group 

 of Lymnaeas of the subgenus Galba. 



It is probably a variation from the catascopium stock, produced by 

 unfavorable conditions, which have dwarfed the shell. It is a signi- 

 ficant fact that the icy-cold spring at Mt. Sinai has produced the 

 same shell characteristics as the brackish water of Crystal Brook. 



There is some variation in the height of the spire in the numerous 

 specimens examined, some individuals having an elongated spire a 

 trifle less than the aperture in length, while in others the spire is 

 less than half the length of the aperture. This shell also varies in 

 corpulency. The inner lip is peculiar and, together with the form of 

 shell, will easily separate this species from catascopium, its nearest 

 ally. 



The shell was first brought to the notice of the writer by Miss 

 Mary Walker of Buffalo, N. Y., who suggested its resemblance to L. 

 bulimoides, and later by Mr. Bryant Walker, of Detroit, Michigan. 



ANNOTATED LIST OF THE MOLLUSCA FOUNB IN THE VICINITY OF 

 LA JOLLA, SAN DIEGO CO., CAL. 



BY MAXWELL SMITH. 



Several winters ago I spent a few months at La Jolla, California. 

 Here an old friend, Mr. Joshua L. Bailey, initiated me in the study 

 of shells. The town lies twelve miles north of San Diego, directly on 

 the coast, and at the base of Mount Soledad. Alternate stretches of 

 beach and rock, caves and muddy shores, afford a congenial home 

 for mollusks. Miniature canyons slope from the hills down to the 

 coast. On the sides of these are found two species of land shells. A 



