IM"2 MOLLUSKS or THE GALAPAGOS 8TEARNS. 



List, of West Ooast Shells, iiicliidos lampe aiul JitUnas; tlu', latter is 

 (lescrilMMl by (J ray as "Hat, smooth externally," etc. It is possible 

 tliaf l(irhi(s IVoin Payla may be a (listiiict species, but I doubt it. Like 

 JidoKts, it is describetl as ''•smootl:,'' but lu'illier eolor, sculpture, form, 

 whether exhibited in outline, convexity, or tiatness, are of any perma- 

 ueuce orof uuieh value as dia.iiuostic characters iu this i;roup; form, as 

 to outUue, convexity, <m' llatuess, is eutirely deixMideut upon the object 

 which the iudividnal Aiiomid lias lastened upou. if it happens to be a 

 I'ccfcn, tlieu the ribbiuy wliich characterizes the scallo]) shells is 

 reproduced iu the Auomia. Iftlur ytMiu;^- Anomia tixes itself in a deep 

 or shallow concavity, or npou tiu>, surface of ii slij;ht or pronounced 

 convex object, the shell iu t lu' course of its jjrowth will be molded 

 accordiujily. Where they fasten upon large, smooth cobbles, in a 

 sheltered nook of the coast, ])rotected from rouj>h seas, they are usu. 

 ally flatter and of nu)re even aud regular growth. Neither are the 

 nuiscular scars to be depended upou, as a valid character for si)ecies- 

 makiug, as aiiyoue can see wlio has a sullicieut quantity of luaterial 

 aud will compare the sanu> with Gray's descri[)tious before him. Car- 

 ])entei-, as belbre noticed, has adopted lampe and fuUnas ; these may for 

 convenience be retained, the latter for the smooth variety, the former 

 for the standard and usual exanii)les, while the remainder of Gray's 

 names may follow in the order of synonyms. 



Family TFCTKNID.E. 



Ooims PECTEN Miill.-r. 



■ 3. Pecten subnodosiis Slty. 



Four right and <»Me left valves, all juniors aud in good condition 

 (Mus. No. lOL»r»lJ»). 



James Island. 



The examples are IVoni !•/ to 12 inches high and have twelve to four- 

 teen ribs. 



Family LIMID.E. 



One broken n alve 

 James Island. 



Genus LIMA nnii^irurc 

 4. Lima arciiata Slty. 



Family AVIGULID/F. 



Ooims PERNA nnimiicrc. 

 5. Perna Chemnitziana <>rl>. 

 =r Isoiiiiottion <'hr)iniil:i(niiim Aiict. 



Two beach valves, one from eacii place. 

 Lnlefatigabh' and Hood islands. 



Wiuuuer's list includes 7. Ict/umrn Gmel. and/. qtiathanguJarc Reeve, 

 but it will be admitted by anyone familiar with the shells of this 



