

130 CREPIDULA. 



Section Ianacus, Murch, 1852. 

 C. UNGUiFORMTS, Lam. PI. 39, figs. 66-68. 



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, Wfst Indies, Mediterranean Sea, 



Peru, Panama to California. Australia, 



Neiv Zealand, Singapore, etc. 

 It is Patella crepidula, Linn., C. Italica, Defrance, C. calceo- 

 Zi?ia, Defrance, G. Deshayesii, Folin (figs. 67,68), C. plana, Say, 

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

 contended that the European G. unguiformis is a different 

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

 both will demonstrate their identit}' to au}^ one. 



Section Siphopatella, Lesson, 1830. 



C. Walshii, Hermannson. PI. 38, figs. 56-58. 



Transverse, concave, white, beak lateral, internal appendage 

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



Gey Ion, Singapore, Ghina Sea, Japan. 



It is G. plana, Ads. and Reeve, not Say, G. 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. 



Ghina. 



Possibly identical with the preceding species and presenting 

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

 Noicia. 



Unfigured and Undetermined Species. 



C. CALYPTB.a:iFORMis, Dcsh. Peru. 



C. NERITOIDES, Rccluz. = Gcnus Latia. 



C. subspirata, Blainv. Hah. unknown. 



C. BUGULOSA, Danker. Gape Good Hope. 



C. NAVICELLA, Lesson. Hab. unknown. 



C. Chiliensis, Lesson. Ghili. 



