ON Moii.rsrA or the west toa'st of north America. 5C3 



4^''). AmpJiiilrsma birolor^Stmtli' ?ri'niisffi. M. 41 fnoii A. Ad. \ 



4"^'. Aniphiiltsittu proxiiiiiiiii, j)robiil)lv =■<>'♦$. vllipticum, \ar. : aot Simele projrima, 



M. 40. = .V/«(v,sr«/i.i. (ild.. M.'p. r;4S. 

 4'"*!*. Auiphitlmntn strinmim, roeiiiMcTi Srfnrlr piilrhrn, no. 4)*8. 

 4'Jl. .Impfiulfftiiin vvntriroMiiH. Scurccly p'rfcct eiiouijh to distinguish the genus. 



The valve outside ri'-itnd)lfs Mncumii suluhiln. 

 4^7. Analinu alta. A valve of PtrliilnniH ; probably one of the Gulf ppeeies. 



498. I'antlora coniuta, iinnied uiid described from a fractured growth ; rcsi niblos 



Vltditjphora clnvirtdnta. 



499, 500 are varieties of the same species oi Azara, of which perhaps no. 501 is an 



extreme form. 

 60G. Corbula nibra= C. hinuliata, jun., no. 503, M. 31. No. 509 are dead valves 



of the 8ame,= ('. po/i/chroma, Cpr. 

 508. Corbula, sp. a, resenib.es ('. pustiilosa, M. .32. 



610. iSiilentrtun affinis, probably =& Ciiribhfritn=.Sifiqiian'a f/ibba, Spengl., S.I. 



Check-List, no. 222. The W. African specimens are attiiiuted to the same 

 species by Mr. Cuming. The Mazatlun shells, M. 37, have a ditilreut 

 aspect, but closely resemble the Ariquibo specimens in Mus. Amherst. 



611. So/en nulis is named Saleiia ohliqua, Spengl., in Mus. Cum. It appears iden- 



tical with EitsuteUa awhit/ua. Lam., as figured by Deless. ; but 'S'. amli>t;iia 

 (I^m.), Swains., is slightly difi'erent, and better agrees with the dead vu.vcs 

 of *' & mediux, Aliitska," in Brit. Mus. These may, however, be only bnlhist- 

 valves. As <S'. atttbiijna. Lam., was described from America, and the form 

 is not known elsewliere, it probably represents the I'anamic shell. 



515. Pholas, sp. a, = laqmaftt, teste Cum. 



610. Pholas, sp. b, closely resembles Dactylina dactylus; also La Paz, teste Kich. 



The following species were collected by Prof. Adams, but do not iippo; r 

 in his Catalogue ; they were found either mixed with others in the Amherst 

 lluseum or in the shell-washings of his duplicates*. 



518. Muniiola ovata. 



519. Chi-ysiillida effusa. 



520. Chrvsallida telescopium. 



521. Chrvsallida fasciata, 



522. Chrvsallida, n. s. 

 525. Leiostraca retexta. 



524. Eulima yod. 



525. Volutella margaiitula. 

 520. Caecum semilseve. 

 527. Caecum subquadratum. 



528. Caecum clathratum. 



529. Lepidopleurus tenu scnlptuai 



5.30. Iscnnochiton Eleueusis. 



5.31. Cerithiop-sis, n. s. 



532. Lucina capMX. 



533. Kellia suborbicularia» 



534. Sphoenla fragilis. 



535. Tellina laminala. 



536. Crenella intlata. 



55. Bnfish Museum Catalogues. — To the list of Deshaycs, Cat. VeneriJce, 

 n-jy be added — 



7. Dositiia ponderosa, GTaj,= Ci/th, gigantea, Sby,,= F<?nM5 cydoides, DOrb. 



[Gulf] California. 

 135, Cf^ione callosa [Desh. et auct. Iint.,= Ch. Jluctt/raga, var., quite distinct from 



Callista (Atnian(is) callosa^, Conr. 

 147. CVitone a*rfrt/-<(«W<'«, Beck, Greenland. [1849. = Tapes fitictuosa, CAd., 1841; 



teste Gld., Otia, p. 181. Midd.'s figures more resemble V. Keimefleyi, juu.] 



The authorities are rarely given for localities quoted in this elaborate 

 •work. The same species often occur under different names. The Veneridce 



* With regard to the species which have received different designations in the Eeigen 

 and Adameiau catalogues, whether those names be retained of which the specimens exist, 

 and liave been widely distributed, in accordance with the diagnoses, or whether the prior 

 ones be adopted of wliich the unique types do not represent the descriptions, is a matter 

 of little moment to the writer of the Brit. Mus. Cat. He spared no pains in makintr-out 

 his jiredecessor's species before describmg his own, and has offered the best sttaiuabie 

 hit of the parallel forms in the review here quoted. 



