ON MOLLUSCA OF TILE WEST COAST OF NORTH AMERICA. 553 
485. Amphidesma bicolor = Semele Prenusta, M. 41 (non A. Ad.). 
487. Amphidesma proxinum, probably =486, ellipticum, var.: not Semele proxima, 
M. 40,= 5. flavescens, Gld., M. p. 548. 
489. Amphidesma striosum, resembles Semele pulchra, no. 488. 
491. Amphidesma ventricosum. Scarcely perfect enough to distinguish the genus. 
The valve outside resembles Macoma solidula. 
497, Anatina alta. A valve of Pertvloma; probably one of the Gulf species. 
498, Pandora cornuta, named and described from a fractured growth ; rescmbles 
Chidiophora claviculata. 
499, 500 are varieties of the same species of Azara, of which perhaps no, 501 is an 
extreme form. 
Corbula rubra=C. biradiata, jun., no. 503, M. 31. No, 509 are dead valves 
of the same,= C. polychroma, Cpr. 
508. Corbula, sp. a, resembles C. pustulosa, M. 32. 
510, Solecurtus affins, probably = 8. Caribbeus=Siliquaria gibba, Spengl., 8S. I. 
Check-List, 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. 
511. Solen rudis is named Solena obliqua, Spengl., in Mus. Cum. It appears iden- 
tical with Lnsatella ambigua, Lam., as figured by Deless. ; but S. ambigua 
(Lam.), Swains., is slightly different, and better agrees with the dead valves 
of “ S, medius, Alatska,” in Brit. Mus. These may, however, be only ballast- 
valyes. 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 Cum. 
516. Pholas, sp. b, closely resembles Dactylina dactylus; also La Paz, teste Rich. 
506. 
> 
The following species were collected by Prof. Adams, but do not appear 
in his Catalogue; they were found either mixed with others in the Amherst 
Museum or in the shell-washings of his duplicates*. 
518. Mumiola ovata. 528. Caecum clathratum, 
519. Chrysallida ettusa. 529. Lepidopleurus tenuisculptus. 
520. Chrysallida telescopium. 530. Ischnochiton Elenensis, 
521. Chrysallida fasciata. 531. Cerithiopsis, n. s. 
522. Chrysallida, n. s. 532. Lucina capax. 
523. Leiostraca retexta. 533. Kellia suborbicularis. 
524, Eulima yod. 554. Spheenia fragilis. 
525. Volutella margaritula, 539. Tellina laminata. 
526. Ceecum semilieve. 536. Crenella inflata. 
527. Caecum subquadratum. 
55. British Museum Catalogues.—To the list of Deshayes, Cat. Veneride, 
may be added— 
Page. 
7. Dosinia ponderosa, Gray,=Cyth. gigantea, Shy.,= Venus cycloides, D'Orh. 
[Gulf] California. 
135. Chione callosa { Desh. et auct. Brit.,= Ch. fluctifraga, vay., quite distinct from 
Callista (Amvantis) callosa}, Cony. 
147. Chione astartoides, Beck, Greenland. [1849. = Zapes fluctuosa, Gld., 1841; 
teste Gld., Otia, p. 181. Midd.’s figures more resemble V, Kennerley?, jun. ] 
The authorities are rarely given for localities quoted in this elaborate 
work. The same species often occur under different names. The Veneride 
* With regard to the species which have received different designations in the Reigen 
and Adamsian catalogues, whether those names be retained of which the specimens exist, 
and have been widely distributed, in accordance with the diagnoses, or whether the prior 
ones be adopted of which 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 making-out 
his predecessor’s species before describing his own, and has offered the best attainable 
list of the parallel forms in the review here quoted, 
