ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 679 



20. Spha-num occidentale, Pr., Proc. A. N. S. Phil. 1860, p. 295, = C. nvalis, Vr., 



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. Sphcermm nobile, Gld. {Cijclas n.), Bost. Proc. 1855, p. 229 [Otia, p. 218]. San 



Pedro, Webb. 



22. Sphcprimn patella, Gld. {Cyclasp.), Bost. Proc. 1850, p. 292 [Otia, p. 80 ; E. E. 



Moll. f. 527, tj^e not returned to S. I.] Oregon. 



23. Sphcerium Spokarii, Baird [P. Z. S. 1863, p. 69, f. 12, 13 : antea, p. 605]. B. Col. 



24. Sphariian tumidum, Baird [P. Z. S. 1863, p. 69, f. 11 : antea, p. 005]. B. Col. 



25. S^jhfP.rium meridionale, Pr., Proc. Ac. N. S. Pliil. 1861, p. 414. Panama ; Mus. 



Prime. 



26. Sphcerium letitieida, Gld. (Liicina* I.), Bost. Proc. 1850, p. 256. California. 



27. Sphariinn subtransversum, Pr., P. Z. S. 1860, p. 322. Mexico. 



28. Pisidium abditum, Hald. [?ul)i]= Ci/clas minor, C. B. Ad. Bost. Proc. 1841, p 48, 



= P. obscurum, Pr., Bost. Proc. '1851, p. 161, 4-P. Kurtzii, Pr., p. 162. + P. 

 zo7iatmn,VT.,^. 162, -f-P. regulare, Pr., Bost. II. vi. 363, pi. 12. f. 11-13, 1852, 

 + P. notatum, Pr., Bost. II. vi. 365, pi. 12. f. 20-22, 1852, + P. amnlKm + P. 

 resartum, Ingalls, MS., + P. rubnwi^-P- plenum, Lewis, MS., +P. retusu-ni, 

 Pr., P. Z. S. 1859, p. 322. 



29. Piddium occidentale, Newc. [Proc. Cal. Ac. Nat. So. 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 tLo 

 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, Pluladelphia, 

 1849), and tabulated in the first Eeport, p. 367, belong to the Smithsonian 

 Institution, but were not discovered there in 18G0. 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. 



Ml/a abriipta, Conr., may be the young of Glycimeris generosa, Gld. 



Thracia trapezoides, Conr., may be mrta, Conr. 



Solemya ventricosa, Conr., has the aspect of a large Lazaria. 



Tellina arctata, Conr., closely resembles Macoma, var. expansa, 



Tellina emacerata, Conr., is perhaps Bodegen&is, Hds. 



Liicina acutilineata, Conr., appears to be borealis, Linn. 



Cardita subtenta, Conr.,= Venericardia borealis, Conr. 



Nucula divaricata, Conr. ,=Acila castrensis, Hds. 



Pectunculus patulus, Conr., may be septentrionalis, IMidd. 



Pecfuncidits nitens, Conr., resembles Psephis tantilla, Gld. 



Pecten propatidus, 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 caurinmn, Gld., it is most closely allied, especially to the 

 Japanese form. 



* Mr. Prime assigns no reason for changing Dr. Gould's Lucina into a Ci/clas, nor any 

 authoi'ity for " California." He was, perhaps, misled by the artist's engraved references to 

 tlie figures 528, a, h, 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 " ?E.. 

 Janeiro" in ' E. E.Moll.,' p. 414. In each place the shell is compared to an Asfarfe ci* 

 Cj/pn'na, 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 erenulated," — characters more con- 

 sistent with Lucina, a. g. Myrtaa, than with Cyclas. If the type cannot be recovered, per- 

 haps the species may be dropped, as it is not the Lucina (^Myrtma) Itnticula, ilve, 



165 



