CREPIDULA.— Plate III. 



Hab. Singapore; Cuming. Ceylon; E. H. Layard. 



A subtransparent white shell, well characterized by its 

 broadly-ovate form, and by the curious rudiment of a cup 

 in connection with the internal appendage. 



Species 18. (Mus. Cuming.) 

 Crepidul.4^ scabies. Crep. testa suiorbicidatd, coiivexd, 

 irrcgulari, apice non marginali, coricenlrice plicato- 

 striatd, diapkano-alld, interdum ferrwjineo-tinctd ; 

 appendice internd plano-concavd, ad latiis obsolete in- 

 jkxd. 



The scab Ceepidula. Shell somewhat orbiculai-ly con- 

 vex, irregular, apex not marginal, concentrically pli- 

 cately striated, diaphanous-white, sometimes stained 

 with rust ; internal appendage flatly convex, obsoletely 

 inflected at the side. 

 Hab. China Seas. 



A convex diaphanous shell, presenting a striking irre- 

 gularity of growth, in which the internal appendage has 

 a flattened inflected fold of even more rudimentary struc- 

 ture than the preceding species. 



