ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 603 
No. 
31. Leda minuta, Linn. One sp. living*. 
82. Yoldia lanceolata, J. Shy. Two sp. liying*. 
33. Yoldia amygdala. One sp. living*. 
34. Haminea hydatis. Two sp. living. 
35, 36. Two species of Tectibranchiates, not yet worked-out by Dr. Alcock. 
37. Tornatina eximia, Baird. Abundant, living. 
38. Cylichna (?yar.) attonsa. One living sp. Probably a variety of cylindracea. 
39. Dentalium rectius,n.s. Very rare, dead. 
40. Acanthopleura scabra. One young living sp. 
41. Mopalia Grayii, n.s. One living sp. 
42. Mopalia Hindsit. One living sp. 
43. Mopalia sinuata, n.s. Two sp. living. 
44, Mopalia imporcata, u.s. Two sp. living. 
45. Ischnochiton (Trachydermon) trifidus, n.s. One living sp. 
46. Ischnochiton Trachydermon) flectens, n.s. One living sp. 
4 
A well-marked group in the genus. 
47. Ischnochiton ( Trachydermon) retiporosus, nu. s. One living sp. 
48. Ischnochiton (Lepidopleurus) Mertensii. Rare, living. 
49. Lepeta cecoides,n.s. Three sp. living. 
50. Calliostoma variegatum, n.s. One living sp. 
51. Margarita ?Vahlii. Three sp. living, = MZ. pusilla, Jeffr., teste A. Ad. 
51b. Margarita (? v.) tenwisculpta. Perhaps a var. of Vahhi, but sculptured. Several 
living specimens. 
52. Margarita lirdata, n.s. Several living specimens, forming a Darwinian group, 
of which var. «. subelevata, var. 8. obsoleta, and Pvar. y. conica might pass 
for species from single specimens. 
53. Margarita inflata, n.s. Two sp. living. 
54, Mesalia lacteola, ?n. s. Two sp. living, but eroded. May prove a var. of 
lactea, but with different sculpture. 
54. Mesalia (?lacteola, var.) subplanata. Two sp. living, but eroded. 
55. Lacuna vincta. One fresh specimen. 
56. Rissoa compacta, u.s. Not uncommon, living. 
57. Drillia incisa, n.s. Two fresh specimens. 
58. Drillia cancellata, n.s. One adeledoand specimen. 
59. Mangelia levidensis, n.s. One fresh specimen. 
60. Mangelia angulatat. One fresh specimen. 
61. Bela excurvata,u.s. (Like Trevelyana.) One fresh specimen. 
62. Chemnitzia (? v.) aurantiat. One fresh specimen. 
63. Chemnitzia torquatat. Two fresh specimens. 
64. Chemnitzia tridentatat. Two fresh specimens. 
65. Eulima micans,n.s, One fresh specimen. 
66. Velutina levigata. Several fine living specimens. 
67. Ocinebra interfossa. Rare, dead. 
68. Nitidella Gouldiit. Two living 2 gerere proving the genus. 
69. Trophon multicostatus. Two fresh specimens. 
70. Chrysodomus ?tabulatus, jun. One young sp. 
71. Chrysodomus rectirostris, n.s. One living sp. 
72, 73. Two species of Cephalopods, not yet affiliated. 
Besides adding more than 70 marine species to the Vancouver branch of the 
Californian fauna, from specimens in good condition, without a single bal- 
last or exotic admixture, the confirmation of many species, which before 
rested only on the uncertain testimony of the U.S. E. E. labels, and the 
affiliation of others which, on the same testimony, had been wrongly assigned 
to distant and erroneous localities, was no slight benefit to science. The 
land and freshwater species of the Expedition will be found tabulated, with 
others, in the separate lists; par. 115. 
103. While the American naturalists were thus actively engaged in ex- 
+ These species were first found by Col. Jewett at Sta. Barbara. Vide p. 537. , 
