526 REPORT — 1863. 



Gray. Mr. Nuttall only brought home younp- 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 CI. 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. Solemrtus NuttaUii [ = 3Licham patida, Uixon, = Auh(s f/randis, (.TmeL, teste 



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

 proportions for the adult of S. lucidus. The shell has been widely distri- 

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

 animal is very beautifully fringed]. 



14. Solcciirti'S Calif ornianus [_=S. Dnmheyi, teste Mus. Uuming : non Hani. MS.]. 



15. Psammohia P'ucijica [is a Ilvtcrodonax, probably identical with the W. Indian 



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

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



17. Sam/uinolaria Californiana l=3Iacoma inconspicua, Brod. & Sby., and is a 



northern &»peciesj. 



18. Sanffuinolaria ruhroradiata [is the young of a large species of Psammoota']. 



22. Tellina alta [ = (from types) ? Scrohicidaria hiangidata, Cpr.]. 



23. [ = J/rtco?«« edidis, Nutt. ; a northern variety of M. secta, no. 25, and quite 



distinct from M. edentula.'] 

 2G. The locality is not confirmed, and is probably erroneous. 



27. [Dr. Gould considers his D. obemis 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'^cies, 

 perhaps S. nasuta, Gld., olim.~\ 

 SOi. Petricola carditoides [with P. arcuafa+cj/Undracea, Desh., are varieties of P. 

 Californica. The series preserved in the Smithsonian Museum connects all 

 the extreme forms]. 



32. ]\lysiu tumida, Conr. MS. [ = Diplodonta orbella, Gld., and belongs to the section 



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

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



S3. 7\q)es staminea. [This is the extreme southern form of a widely diffused and 

 very variable species, af which the normal condition is Saxidonms Petitii, 

 Desh.,= Venus rif/ida, Gld. jiars. The principal varieties have been named 

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



J34. [The Cal fornian Saxidomi divide themselves into three groups : the large, 

 southern, oval, grooved shells = 'S'. aratus, Gld. ; the subquadrate, compara- 

 tively smooth, northern shells = 'S'. squalidus+giganteus, Desh.; and an 

 intermediate form, which is the true S. JSidtaUii, 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.] 



35. [The young of this Pachydesma is " Ti-iyona stidtorum, Gray," Desh. MS. in 



British Museum.] 



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



subgenus, ^4 «»««,'z,s, differing from Callista as Mercenaria does from Ve7ms~\. 



37. Plate 19, fig. 10 (not 14 nor 15). [The true Venus Nidtallii 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. 

 Califormensis, 'B\'od..,=succincta, 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 oi Stutchburyi,Jlucfifraya, &c. If really 

 distinct from the latter, it may stand as Chiune calhsa, Sby. jun. (non Conr.)"] 



33. Venus Californiana [(teste Conr. ips.) was intended for' V. Calif orniensis. 



Brod. Not having access to the ty^a, it could hardly be recognized by the 



12 



