^"l8ii'j"J PKOCKEDINdS OK I'lll'; NA'I'IONAL RIUSKIJM. 375 



Kninily ( "I I AMI I). K. 



(»»Miu.s CHAMA K^ll<;llil^^•. 



14. Chaiiia echinata Uiod. 

 Valvos, beach. 



IiuU'fjitijiiiblc ;mu1 .Imiiics ishiiuls. 



Five odd vahcs, Jiiiiiois IVoni the loriiiei- iiiid one prohiiltly ofMiiK 



species iVom (lie latter islaiid. 



15. Chama fiondosa Brod. 

 Valves, beach. 



(Several odd valves, <>'enei-!illy in |)oor coiidilion iVoni .lames and (wo 



IVoni Hood Island. Tiiis species is eoninion at many places on the 



main land cdSonth America; it is a vaiialde form, and (he more north- 



<Mly, (K spinosa P.rod., may be nothing- bnl a varie(y ol' this. lieeve 



hascredited other specues to (lie (Salapaj^os, yi/.., si>iii<>s((, ,/((inis, nud 



imhricKtd, {\\i\ value ol" which i( is no(. easy (o determine; i( is (pii(e 



probable tha( (oo many species lia\-eb<'en ma<le, Al.so dredged oil" the 



coast of liower CaliConiia in U.\ ladioms. 



I'^iniily (lAliDI II >.!<]. 



(icMMs CARDIUM l.iniir. 

 16. Cardium coasors linxl. 



One left valve, beach. 

 James Island. 



Valves, beach. 

 James Island. 



Family VFNFIilD.F. 



(icmis CHIONE Moj;.iIo. 

 17. Chioiie multicostata Sby. 



18. Chioiie conipta ISrod. 



Three lelt valv^es, beacii. 

 i ndelalijiable Island. 



19. Chione iindatella Sl»y. 

 Valves, b4'ach. 



James Island. 



Two ri^iit and I'oiir left valves of whal may be regarded as (his 

 siH'cie.s; the i;i'oiip (o which it belonj;s is exceedinjjiy mimerons in 

 individuals, and nniny species have ai)parenlly been made on simple 

 varietal differences. Neither (.Carpenter's nor Winimer's list credit any 

 species of Chione to the CJalapagos islands. The Alhafro.ss shells agree 

 more nearly with the northerly undatrUa than with the geographically 

 related forms trom the mainland olHonth America. 



