59.2 HEPORT— 1863. 



Ege. The types of these species in the Smithsonian ITuseiim a^ ^ "a^ too im- 

 perfect to determine specifically with any confidence ; and 'by no means in <> 

 suitable condition to allow of important conclusions being drawn from them. 

 98. The third article in the Appendix to the same volume of Keports 

 contains a " Catalogue of the Eeeent Shells, with Descriptions of the New 

 Species," by Dr. A. A. Gould. The specimens were (apparently) in the handa 

 of Dr. Gould for examination when he prepared the MS. for the first Eeport; 

 and some of them were included in the " Mexican "War Collections," B. A. 

 Eeport, pp. 227, 228. " The freshwater shells were collected in the Colorado 

 desert and other localities ; the land and marine sheila between San Francisco 

 and San Diego." The following is the list of species as determined by Dr. 

 Gould, pp. 330-336. The specimens belong to the Smithsonian Institution, 

 where a large portion of them were fortunately discovered and verified. 

 They were collected by W. P. Blake, Esq., and Dr. T. H. Webb. 



Plate. Fig. No. 



1. Ostrea, sp. ind. Parasitic on twigs ; thin, radiately lineated with 



brown. [= 0. concha)Mla, C^v.~\ Another species, elongated, 

 solid, allied to Virginica [var. rufoidei]. San Diego. 



2. Pecten monotimeris, Conr. San Diego. 



3. Pecten ventncosus, Shj.,+tumidus, Sby. [Dead valves, of the 



form ceqidsulcatus.l San Diego. 



4. Myiilus ?edulis [==]^- trossulus, Gld., antea]. San Francisco. 

 6. Modiola capax, Conr. San Diego. 



6. Ven^^s Nuttallii, Conr. [= V. succincta, Val.] San Pedro. 



7. Venus finctifraga, Sby. San Diego. 



8. Tapes grata, Say,= T. discors, Sby., "=straminea, Conr."* San 



Pedro. 



XL 10,20. 9. Tapes gracUiSfGldL.jii.a. Prel. Rep. 1855. [Quite distinct fi-om 

 every other Tapes known from the coast. It is supposed by 

 Dr. Cooper to be the young of Saxidomus aratu?, which in 

 shape and pattern exactly accord with the figure and diagnosis. 

 But the " Tapes'''' is figured without sculpture. The shell was 

 not found at the Smiths. Inst.] San Pedro, Blake. 

 10. Ck/clas, sp. ind. Colorado Desert. 



XT 21,22. 11. Cardium cruentatum, Gld., n.s. Prel. Rep. 1855. [P. Z. S. 1856, 

 p. 201, = C. suhstriatum, Conr.] San Diego. [San Pedro-, 

 Blahe, in text.] 



12. Lucinaorbella,Qtd.[ = "Mt/sia(8pharella)tumida" Com.'] San 



Pedro. 



13. Lucina Nuttallii, Conr. vSan Pedro. 



14. Meiodesma ? ruhrotincta, Sby.f San Pedro. 



15. Tellina vicina, C. B. Ad. [Dead specimens of = Seterodcmax 



(" Psammobia" var.) Pacifica, Conr.] San Diego. 



16. Tellina secta, Conr. San Pedro. 



17. S!>hiT»ia l_Cn/i>toinga'] Calif ornica, Goxa. San Diego. 



18. Petriciila carditoides,Conr.,=ci/lindracea,'Deah. Monterey; Saa 



Pedi'o. 



10. SolecuHus Calif orniensis, Com*. San Diego. 



20. Gnathodon Lecontii,Gom:.,= G.tngommi, V&tit. Colorado Desert. 

 [Lecontei is probably the large Texan species : trigonus = meii- 

 dieus is a very distinct shell from Mazatlan.]" 



* Neither Dr. Gould, nor Conrad himself, in his later geological writings, appears to 

 have called to mind the true T. staminea, to wliich the Smithsonian shells belong. It is 

 the northern representative of T. grata, but quite distinct : v. synonymy under 'Fetiu.t 

 Fetitii — rigida, pars. 



f- No " Mesodesma'' was found among the shells returned to the Smithsonian Institu- 

 tion, nor has any been heard-ot fi-om the coast. Dr. Gould's shell may have been Semelc 

 pulokra, which was in the collection. 



78 



