ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 679 
20. Spherium occidentale, Pr., Proc. A. N. 8. Phil. 1860, p. 295, = C. ovalis, Pr., 
Bost. Proc. 1852, p. 276 (nom. preoc.),=‘ Sph. ovale, Stn.,’ Add. Gen. vol. ii. 
p-450. Hab, New York to Georgia; Vermont to Wisconsin; Hell-gate 
River, W. T. 
21. Spherium nobile, Gld. (Cyclas n.), Bost. Proc. 1855, p. 229 [Otia, p. 218]. San 
Pedro, Webb. 
22. Spherium patella, Gld. (Cyclas p.), Bost. Proc. 1850, p.292 [Otia, p. 86; E. E. 
Moll. f. 527, type not returned to 8. I.] Oregon. 
23. Spherium Spokant, Baird [P. Z. 8. 1863, p. 69, f. 12, 13: anted, p.605]. B. Col. 
24. Spherium tumidum, Baird [P. Z. S. 1863, p.69, f. 11: anted, p.605]. B. Col. 
25. si meridionale, Pr., Proc. Ac, N.S. Phil. 1861, p.414. Panama; Mus. 
rime. 
26. Spherium lenticula, Gld. (Lucina * 1.), Bost. Proc, 1850, p. 256. California. 
27. Spherium subtransversum, Pr., P. Z. 8. 1860, p. 322. Mexico. 
28. Pisidium abditum, Hald. [Pubi]= Cyclas minor, C. B. Ad. Bost. Proc. 1841, p.48, 
= P. obscurum, Pr., Bost. Proc. 1851, p. 161,+ P. Kurtz, Pr., p. 162,-+ P. 
zonatum, Pr., p. 162,+ P. regulare, Pr., Fagk IL, vi. 363, pl. 12. f£. 11-13, 1852, 
+ P. notatum, Pr., Bost. Il. vi. 365, pl. 12. f. 20-22, 1852, P. amplum + P. 
resartum, Ingalls, MS.,+ P. rubrum+P. plenum, Lewis, MS., +P. retusum, 
Pr., P.Z.S. 1859, p. 322. 
29. Pisidium occidentale, Nowe. [Proe, Cal. Ac. Nat. Se. 1861, p. 94]. San Fran- 
cisco, Rowell. 
120. Of the tertiary fossils throwing light on existing species no addi- 
tional information has yet been published. We cannot but hope that the 
researches of Mr. Gabb, on the fossils collected by the Californian Geological 
Survey, will develope relations of great interest between the existing and 
former conditions of the continent. The Astorian fossils described by Mr. 
Conrad from the U. S. Exploring Expedition (vol. x., Geology, Philadelphia, 
1849), and tabulated in the first Report, p. 367, belong to the Smithsonian 
Institution, but were not discovered therein 1860. All of them, however (in- 
cluding the indeterminate species), are figured in the atlas of plates. They 
resemble the fossils of the Pacific Railroad Expeditions in being very imper- 
fect, for which reason the following criticisms may prove erroneous. The 
general aspect of the collection betokens the Miocene period. 
Mya abrupta, Cony., may be the young of Glycimeris generosa, Gld. 
Thracia trapezoides, Conr., may be curta, Conr. 
Solemya ventricosa, Conr., has the aspect of a large Lazaria. 
Tellina arctata, Conyr., closely resembles Macoma, var. expansa. 
Tellina emacerata, Conr., is perhaps Bodegensis, Hds. 
Lucina acutilineata, Conr., appears to be borealis, Linn. 
Cardita subtenta, Conr.,= Venericardia borealis, Cony. 
Nucula divaricata, Conr.,= Acila castrensis, Hds. 
Pectunculus patulus, Conr., may be septentrionalis, Midd. 
Pectunculus nitens, Conr., resembles Psephis tantilla, Gld. 
Pecten propatulus, Conr. A very fine specimen, enclosed in a large nodule 
from Oregon, was presented to the Brit. Mus. by Mr. C. Pace. If not identical 
with Amusium caurinum, Gld., it is most closely allied, especially to the 
Japanese form. 
* Mr. Prime assigns no reason for changing Dr. Gould’s Zucina into a Cyclas, nor any 
authority for “ California.” He was, perhaps, misled by the artist’s engraved references to 
the figures 528, a, >, where he has drawn a rule, referring to the Cyclades above, instead of 
writing Lucina. It is assigned to ‘‘?Coast of Patagonia” in~ Otia,’ p. 63, and to “?R. 
Janeiro” in ‘ EH. E. Moll.,’ p.414. In each place the shell is compared to an Astarte or 
Cyprina, with lateral teeth. The type was not returned to the Smithsonian Institution ; 
but the diagnosis states that it is “chalky, thickened within the deep and jagged pallial 
line, sculpture faint but decussated, and margin finely crenulated,”—characters more con- 
sistent with Lucina, s.g. Myrtea, than with Cyclas. If the type cannot be recovered, per- 
haps the species may be dropped, as it is not the Lwcina (Myrtea) lenticula, Rye. 
