2g West American Scientut. 



marked by numerous revolving crenulated or tuberculated coarse 

 lines or slender ridges, and the anterior side of the last one is 

 marked in a similiar manner; suture not readily distinguishable 

 from the interspaces between the revolving ridges of the spire; 

 aperture, when occuring between the longitudinal folds, compara- 

 tively small, beak short; canal narrow. Height of the largest 

 example in the collection, 12"""; greatest diameter of the last volu- 

 tion, 7™"\ In general aspect, this shell resembles C. sexangula- 

 tum from the Gossau formation of Europe, but it differs from that 

 species in being proportionally shorter, in the character of its re- 

 volving ridges, and in having the spaces between the longitudinal 

 folds upon the spire more flattened. The specific name is given 

 in honor of Mr. J. C. Pilling, of the U. S. Geological survey. 

 Locality: Shore of Todos Santos Bay, with the last. 



Cerithium Totium Sanctorum, White. 



Shell small, slender; sides of the spire straight or slightly 

 concave ; volutions eleven or twelve in number, not converse ; each 

 volution marked by four tuberculated revolving ridges, the 

 anterior one being usually a little more prominent than the other 

 three; at irregular and somewhat wide intervals upon the volu- 

 tions there are moderately prominent longitudinal folds which are 

 sometimes arranged approximately in rows along the spire, but 

 they are as often scattered; suture impressed, its presence being 

 indicated by a space between the revolving ridges which is a little 

 wider than the other spaces; anterior side of the last volution 

 marked by small revolving ridges, but they are crenulated and 

 not tuberculate like those upon the sides of the spire; beak 

 moderately small; canal narrow; length 2c"""; diameter of the 

 last volution 7"""; locality, shore of Todos Santos Bay, with the 

 preceding. 



Solarium Wallalense, White. 



Shell of medium size, depressed; volutions about four in 

 number, increasing somewhat rapidly in size, corinate at the 

 periphery, broadly convex between that carina and the suture; 

 umbilicus of medium size having an obtuse carina at its margin; 

 the space between the peripheral and umbilical carinas is flattened 

 and marked bv numerous very small obliquely-radiating ridges, 

 the inner surface of the umbilicus also marked by numerous very 

 small radiating lines or ridges which are made crenulate by the 

 presence of numerous revolving lines. The type specimen shows 

 that the volutions of the spire also bore obHquely-crenulated 

 markings, but it has been so much withered that they are nearly 

 obliterated. Height about 17"""; greatest diameter about 25""". 

 The only example that has been obtained is quite imperfect, but 



