130 CREP1DULA. 



Section IANACUS, Morch, 1852. 

 C. UNGUIFORMJS, Lam. PL 39, figs. 66-63. 



Narrow, upper surface, usually flat or concave, with apex 

 direct and marginal, somewhat lamellar, milk white, interior 

 highly polished, the septum convex. Length, 1 inch. 

 Nova Scotia to Texas, We.st Indies, Mediterranean Sea, 



Peru, Panama to California, Australia, 



New Zealand, Singapore, etc. 



It is Patella crepidula, Linn., C. Italica, Def ranee, C. calceo- 

 h'no, Defrance, C. Deshayesii, Folin (figs. 67, 68), C. plana, Say, 

 C. sinuosa, Turton, G. Candida, Risso. Some authors have 

 contended that the European C. unguiformis is a different 

 species from our C. plana ; the comparison of large suites of 

 both will demonstrate their identity to any one. 



Section SIPHOPATELLA, Lesson, 1830. 



C. WALSHII, Hermannson. PL 38, figs. 56-58. 



Transverse, concave, white, beak lateral, internal appendage 

 oblique, inflected at the outer side. Width, 1'25 inches. 



Ceylon, Singapore, China Sea, Japan. 



It is C. plana, Ads. and Reeve, not Say, C- scabies, Reeve 

 (fig. 58). 



C. CHINENSIS, Gray. PL 39, figs. 69-71. 



Spiral, with one and a half or two whorls, pale brown or 

 whitish, internal plate thin with a lateral fold. 



China. 



Possibly identical with the preceding species and presenting 

 a more free growth of it. It is the t} 7 pe of Gray's group 

 Noicia. 



Unjfigured and Undetermined Species. 



C. CALYPTR^EIFORMIS, Desh. Peru. 



C. NERITOIDES, Recluz. = Genus Latia. 



C. SUBSPIRATA, Blainv. Hab. unknown. 



C. RUGULOSA, D unker. Cope Good Hope. 



C. NAVICELLA, Lesson. Hab. unknown. 



C. CHILIENSIS, Lesson. Chili. 



