ON MOTLFTA OP THE WEST CO A ST OF NORTH AMERICA. 5C3 



485. Amphidesma bicolor = Semcle ?renusta, M. 41 (non A. Ad.). 



487. Amphidesma proxmmm, probably = 486, elUpticum, var. : not Stnwle jji-oxwia, 



M. 40,=: SfarcsccNs, Old., M."p. o48. 

 48n. Amphidcsvta striosum, resembles Scmele jndchra, no. 488. 

 491. Amphidesma ventricostun. Scarcely perfect enougb to distingiush the genus. 



The valve outside resembles Macoma solidida. 



497. Anatina alta. A valve of Periploma ; probably one of the Gulf species. 



498. Pandora cormita, named and described from a fractured growth ; restmbles 



Clidiojjhora claviculata. 



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



extreme form. 



606. CorbuJa mbra=C. biradiafa, jun., no. 503, M. .31. No. 509 are dead valves 

 of the same,= C. polychroma, Cpr. 



508. Corbula, sp. a, resemb.es C. ptisfulnsa, M. 32. 



510. Solecurtus ajjinis, probably =5. Caribbeeiis = Siliqvaria gibba, Spengl., S.I. 

 Check-Li.st, no. 222. The W. African specimens are affiliated to the same 

 species by Mr. Cuming. The Mazatlan shells, M. 37, have a different 

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



611. Solen rudis is named Soletia ohiiqua, Spengl., in Mus. Cum. It appears iden- 

 tical with EnsateUa ambie/ua. Lam., as figured by Deless. ; but S. amlifjua. 

 (Lam.), Swains., is slightly different, and better agrees with the dead va.ves 

 of " S. medius, Alatska," in Brit. Mus. These may, however, be only bnllnst- 

 valves. As S. ambiijtia, Lam., was described from America, and the form 

 is not known elsewhere, it probably represents the Panamic shell. 



515. Pholas, sp. a,-=laqueata, teste Cum. 



616. Pholas, sp. b, closely resembles DadyUna dactylus; also La Paz, teste Rich. 



The following species were collected by Prof. Adams, but do not apperr 

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

 Museum or in the shell-washings of his duijlicates*. 



618. Mumiola ovata. 



619. Chrysallida effusa. 



520. Chrysallida telescopium. 



521. Chrysallida fasciata. 

 622. Chrysallida, n. s. 



523. Leiostraca retexta. 



524. Eulima vod. 



625. Volutella margaritula. 



626. Caecum semiheve. 



627. Caecum subquadratum. 



628. Caecum clathratimi. 



629. Lepidopleurus tenu'senlptua. 



630. Ischnochiton Eleuensis. 

 531. Cerithiopsis, n. s. 

 632. Lucina capax. 

 533. KeUia suborbicidaria, 

 634. Sphfenia fragilis. 



535. Tellina lamina^ta, 

 636. Crenella inflata. 



55. British Museum Catalogues. — To the list of Deshayes, Cat. Veneridce, 

 nuy be added — 



Pa<e. 



7. Dosinia potulerosa, Gmj, = Cyth. gigantea, Shj.,= Venus cticloides, DOrb. 



[Gulf] California. 

 135. Cnione callosa [Desh. et auct. Bni.,= Ch.Jluctifraga, var., quite distinct from 



Callista (Amianiis) callosa'], Conr. 

 147. CAtone aste?-«o?V/('s, Beck, Greenland. [1849. =Ta2}es fluctuosa, G\&., 1841; 



teste Gld., Otia, p. 181. Midd.'s figures more resemble V. Komerleyi, jun.] 



The authorities are rarely given for localities quoted in this elaborate 

 work. The same species often occur under different names. The Vmeridee 



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

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

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

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

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

 his predecessor's species before describmg liis own, and has offered the best attainable 

 lidt of the parallel forms m the review here quoted. 



39 



