ON MOTJ.TT'^rA OP THE WEST COAST OF NORTH AMERICA. 



553 



4S5. Ampliidesma hiciilor = Scmele ?renusta, M. 41 (nou A. Ad.)- 



487. AmpJdrhsma pruxinuim, probably = 486, ellipticum, vai: : not Semele proxima, 



M. 40, = S.Jlavesfeiis, Gld., M. p. 54S. 

 489. Amphuhsma striosum, resembles Semele pulchra, no. 488. 

 491. Arnphidesma venhicosum. Scarcely perfect enough to distinguisb the genus. 



The valve outside resembles Macoma soUdula. 



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



498. Pandora cornuta, named and described from a fractured growlh ; resembles 



Clidiophora claviculata. 



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



extreme form. 

 506. Corbula ruhra= C. hiradiata, jun., no. 503, M. 31. . No. 509 are dead valves 



of the same, = C. polychroma, Opr. 

 508. Corbula, sp. a, resembles C. pustulosa, M. 33. 



610. Soleetirfus affinis, probably = jS. Caribbceus = Siliqtiaria gibha, Spengl., S.I. 



Check-List, no. 222. The W. African specimens ai-e affiliated to the same 

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

 aspect, but closely i-esemble the Ariquibo specimens in Mus. Amherst. 



611. Solen rudis is named Solena dbliqua, Spengl., in Mus. Cum. It appears iden- 



tical with Ensatella ambigua, Lam., as figured by Deless. ; but <S'. amhiffua 

 (Lam.), Swains., is slightly different, ami better agTees with the dead valves 

 of " S. medius, Alatska," in Brit. Mus. Tliese may, however, be only ballast- 

 valves. As »S'. ambigua, Lam., was described from America, and the form 

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



515. Pholas, sp. a,=laqueata, teste Ciun. 



616. Pholas, sp. b, closely resembles Dadylina dactylus; also La Paz, teste liich. 



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

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

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



518. Mumiola ovata. 



519. Chrysallida eft'usa. 



520. Chrysallida telescopium. 

 621. Chrysallida fasciata. 



522. Chr3'sallida, n. s. 



523. Leiostraca retexta. 



524. Eulima yod. 



525. Volutella margaritula, 



526. Cascuni eemilfeve. 



527. Caecum subquadratum. 



528. Csecum clathratum. 

 629. Lepidopleurus tenuiscnlptiis, 

 530. Ischnochiton Elenensis. 

 631. Cerithiopsis, ii, s. 



532. Lucina capax. 



533. Kellia suborbiculaiisi. 



534. Sphsenia fragilis. 



535. Tellina lamina. a. 



536. CreneUa inflata. 



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

 may be added — 



Page. 



7. Dosinia ponderosa. Gray, = Cyth. gigantea, Sby., = Venus cy chides, D'Orb, 



[Gulfl California. 

 135. Chiane caUosa [Desh. et auct. Brit., = Ch. Jhtciifraga, var., quite distinct from 



Callista (Amiantis) callosa'], Conr. 

 147. Chione astartoides. Beck, Greenland. [1849. = Tapes fiaduosa, Gld., 1841 ; 



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



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 Beigen 

 and Adamsian catalogues, whether those names be retained of wliioh the specimens exist, 

 and have been widely distributed, in accordance with the diag^ioses, or whether the prior 

 ones be adopted of which tlie 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 maliing-out 

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

 Hat of the parallel forms in the review here quoted. 



39 



