526 REPOKT— 1863. 



Gray. Mr. Nuttall only brought home young specimens of this extraordinary 

 shell. In its adult state it assumes either a transverse form { = capax) or 

 the elongated condition, redescribed in a fossil state as new. Between 

 these there is every gradation, as can be traced in the mag-nihcent series m 

 the Smiths. Mus. ; and a caskfid of the animals in spirits, of various ages, 

 has affiliated the large shells to the original Nuttallian specimens.] 



10. Pandora punctata [is a Clidiophora. The series so named in the Nuttallian 



collection belongs, however, to the Atlantic CI. trilimatd\. 



11. Solemi-tm lucidits [is almost certainly the young of no. 12. The amount of 



obliquity in the internal rib is extremely variable in the adult specimens]. 



12. Solecurtus Nuttallii [ = MacIiara patula, t)ixon,—Aulus grandis, Gmel., teste 



Hds. in Mus. Cum. Mr. C.'s "grandis, var.," from Monterey, suits in its 

 proportions for the adidt of S. lucidm. The shell has been widely distri- 

 buted by commerce, and appears to extend far in a northerly direction. The 

 animal is very beautifully fringed]. 



14. Solecurtus CaUfornianus [=<S. Dombeyi, teste Mus. Cuming :_ non Hani. MS.]. 



15. Psammohia Pacifica [is a Heterodmax, probably identical with the W. Indian 



H. Umacidata, which is found abundantly in its many varieties at Aca- 

 pulco ; = TV&'na vicina, C. B. Ad.]. 



17. Sanguinolaria Californiana [=Macoma inconspicua, Brod. & Sby., and is a 



northern species]. 



18. Sanguinolaria ruhroradiata [is the young of a large species of Fsammoma']. 



22. Tellina alta [ = (from types) ? Scrohicularia biangidata, Cpr.]. 



23. [ = Macoma edulis, Nutt. ; a northern variety of M. secta, no. 25, snd quite 



distinct from M. edenttda.'] 

 28. The locality is not confinned, and is probably erroneous. 



27. [Dr. Gould considers his D. obesun a distinct species ; from a large series, it 



appears identical.] 



28, 29. [^These species of Standella, described from young specimens, were tound 



of very large size by Dr. Cooper, with what may prove a third sp-jcies, 

 perhaps S. nnsuta, Gld., oZtm.] 

 OOJ. Petricola carditoides [with P. arcuata+cglindracea, Desh., are varieties of P. 

 Calif ornica. The series preserved in the Smithsonian Museum connects all 

 the extreme forms]. 



52. Mysia tumida, Conr. MS. \_=Diplod(mta orhella, Gld., and belongs to the section 



Spharella, Conr. The label had been assigned by accident to a young valve 

 of a Chione, probably from the Sandwich Is.]. 



53. Ta2')es staminea. [This is the extreme southern form of a widely diffused and 



very variable species, of which the normal condition is Saxidomns Petitii, 

 Desh.,= Venus rigida, GASl. pars. The principal varieties have been named 

 Tapes diversa, Sby.= Venies mundultis, Rve., and Venus niderata, Desh.] 

 i54. [The Califomian Saxidomi divide themselves into three groups : the large, 

 southern, oval, grooved shel]s = 6'. aratui, Gld. ; the subquadrate, compara- 

 tively smooth, northern shells=iS'. squalirlus+giganteics, Desh.; and an 

 intermediate form, which is the true S. RidtaJliij Conr. Some of Mr, Xut- 

 taU's specimens were, however, the young of S. aratm, of which the adult 

 was not known till very recently.] 



35. [The young of this Pachgdestna is " Trigona stidtorum, Gray," Desh. MS. in 



British Museum.] 



36. Cytherea callosa [ = C. nohilis, Rve. It is not a Dosinia, but the type of a new 



subgenus, Aimanlis, differing from Callista as Mercenaria does from Vcmis']. 



fi7. Plate 19, fig. 16 (not 14 nor 15). [The true Venus Nuttallii of Conr. (teste 

 Conr. ips. and types in Mus. Phil. Ac. and Jay) is not the shell here cata- 

 logued, which generally goes by that name, but is a synonym for the V. 

 Calif orniensis, 'Bm&.,=succmcta, Yal. The error was corrected in the Mus. 

 Cum. in time for the right shell to be figured by Reeve in his recent mono- 

 graph. It is doubtful what name Conrad intended for the shell here cata- 

 logued, which belongs to the group of Stutchburyi.Jluctifraga, &c. If really 

 distinct from the latter, it may stand as Chione callosa, Sby.'iun. (iionConr.)! 



S8. Venus Californiana [(teste Conr. ips.) was intended for' t^. Calif onnenm . 

 Brod. Not having access to the type, it could hardly bo recognized bv the 



1^ 



