526 REPORT 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 magnificent series in 

 the Smiths. Mus. ; and a caskful 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 Cl. trilineata]. 



11. Solecurtus lucidus [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 \_=Machfsra patula, Dixon,Aulus grandis, Gmel., teste 



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

 proportions for the adult of S. lucidus. 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 Californianus \_=S. Dombeyi, teste Mus. Cuming : non Hani. MS.]. 



15. Psammobia Pacijica [is a Heterodonax, probably identical with the W. Indian 



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

 pulco ;= Tellina vicina, C. B. Ad.]. 



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



northern species]. 



18. Sanguinolaria rubroradiata [is the young of a large species of Psammobia"]. 



22. Tellina alta [ = (from types) ? Scrobicidaria biangulata, Cpr.]. 



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



distinct from M. edentula.~\ 



26. The locality is not confirmed, and is probably erroneous. 



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



appears identical.] 



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



of very large size by Dr. Cooper, with what may prove a third species, 



perhaps S. nasuta, Gld., blimJ] 

 306. Petricota carditoides [with P. arcuata+cylindracea, Desh., are varieties of P. 



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



the extreme forms]. 

 32. Mysia tumida, Conr. MS. [ = Dtplodonta orbctta, Gld., and belongs to the section 



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



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



83. Tapes staminea. [This is the extreme southern form of a widely diffused and 



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

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

 Tapes diversa, Sby.= Venus mundulus, Jive., and Venus ruderata, Desh.] 



84. [The Callfornian Saxidomi divide themselves into three groups : the large, 



southern, oval, grooved shells = & aratus, Gld. j the subquadrate, compara- 

 tively smooth, northern shells =S. squali(h<s-\-giganteus, Desh.; and an 

 intermediate form, which is the true S. Nuttallii, Conr. Some of Mr. Nut- 

 tail's specimens were, however, the young of S. aratus, of which the adult 

 was not known till very recently.] 



85. [The young of this Pachydesma is " Trigona stultorum, Gray," Desh. MS. in 



British Museum.] 



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

 subgenus, Amtantis, differing from Callista as Mercenaria does from Venus], 



87. Plate 19, fig. 16 (not 14 nor 15). [The true Venus NuttaUii 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, T$rod.,=succmcta, Val. 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,Jluctifraf/a, &c. If really 

 distinct from the latter, it may stand as Chione callosa, Sby. jun. (non Conr. f] 



38. Venus Californiana [(teste Conr. ips.) was intended for V. CaHforniensit. 

 Brod. Not having access to the type, it could hardly be recognized by the 



12 



