ON MOLLUSCA OF THE WEST COAST OP XOIITH AMERICA. COT 



Vo. 



65. " Siiceinfn ri'»tica>ia. Ci\d." Sumass Prairie, Fraser K., Zort/. [Scarcely to be 

 distiuiruisbed from the Europet-.n S. 2)ntri.s.^ 



56. " Planorhis corpidentus, Hay." Lake Osoyoos ; Syuiakwateen j Marsh, Koo- 



tanie East, Brit. Col., Lord. 



57. Plaiiorbts 'f giibcrfimtiig, var. Sumass Prairie, Brit. Col., Lord. 



58. " Limncea staynalis," typical, tiue, and abuudaut. Lake Usoynos, Fi-aser R., 



Lord. 



58. Limtieea stagnalis, long narrow spire, mouth swollen, closely fenestrated. 

 Marshy stream, Syniakwateen, Lord. 



6S. '' LiiniK&a ?desidiosa, Say."' Lake Osoyoos ; three sp., Lord. [Exactly re- 

 sembles a var. of the widely distributed L. catanwta, which was found in 

 profusion in the Madison Lakes, Wise.] 



60. "LimtMa ?de.ndiosa, Sav." Syniakwateen, Brit. Col., Lord. One sp. [Very 



turrited, whirls swollen ; epidermis linelv striated. Tiie same species occurs* 

 as " L. meffasoma, Say. Lake Osoyoos.' ] 



61. " Phi/sa heterostropha, Say." Sumass I'rairie, Fi-aser R. A variety from Lake 



Osoyoos, Lord. 



62. ^lysa [probably young of Lordi, but with orange band inside labrum.] Koo- 



tanie R. East, Brit. Col., Lord. One sp. 



Besides the shells preserved in the National Collection, the following 

 epecies were also brought by the Expedition : — 



63. Terehratula unguicidm, n. s. Vane. Is., Forbes. One adult .specimen, Mus. 



Cum. [Extremely interesting as being the only sculptured specirs knowu 

 recent. The young shells from California were naturally ailiiiated to 

 Terebratella captd-serpentis bj' Messrs. Reeve and Ilanley ; but the adult ha« 

 the loop similarl}' incomplete.] 



64. Hh'/nconetla pxittacea. Vane. Is., Forbes. One specimen, Mus. Cum. 



Co. Darina declivis, n. s. Vane. Is., Forbes. One specimen. [The only other 

 species of Darina is from the West Coast of S. America.] 



66. dementia »ibdiaphima. Vane. Is., Forbes. One broken sp. 



67. Siixidomus brecisiphonatus, n. s. This unique shell is marked "Vancouver 



Island" in Mr. Cuming's Collection, and is believed by him to have furuud 

 a part of Dr. Forbes's series. The shape resembles Callista, without luuule. 

 The mantle-bend is remarkably small for the genus. 

 63. Melania, n. s.) teste Cuming. Vane. Is., Forbes. [Two specimens, with very 

 fine spiral striae, sent to Philadelphia for identification. j 



69. Mesa/ia lacteola. Vane. Is., Forbes. One sp., Mus. Cum. 



70. Pteropoda, several species, of which two are new, teste Cuming ; but they may 



have been collected on the voyage. Forbes. 



The collections made on the British Survey are peculiarly valuable to the 

 student in consequence of the great perfection of the specimens. They have 

 generally been obtained alive, and arc often the finest known of their kinds. 

 The occurrence, however, of a specimen of the tropical OrthaUrns zebra, 

 narked " Vancouver's Island," in Mr. Lord's collection*, is a useful lesson. 

 Wlien such reliable data are thus found possessed of adventitious materials, 

 it will not be regarded as a slight on the collections of the most careful 

 naturalists when specimens are regarded as of doubtful geographical accuracy. 

 In Dr. Lyall's collections there also occur specimens of the well-known Fafefia 

 Mitfj/elhtnica and Trophon Magellamcus, duly marked " Vancouver's Island," 

 though no doubt collected in the passage round Cape Horn. The naturalists 

 ©f the American Expl. Expeditions generally travelled across the continent. 



104. The latest exploration undertaken for State purposes is aLo for our 

 present object by far the most important, both as relates to the number of 



• Mr. Lord writes, "The fact of my having found this shell, alive, on Vaneourer 

 Island is beyond question. How it got thera I do not ^)retend to say ; it was rery pot* 

 •ibly brought by soine ship," 



93 



