526 
10. 
11. 
12, 
14. 
16, 
17. 
18. 
22. 
23. 
26. 
27. 
28, 29. 
Solecurtus Nuttall | =Machera patula, Dixon, = Aulus grandis, 
REPORT—18638. 
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 specimen 
S. 
Pandora punctata [is a Chdiophora, 'The series so named in the Nuttaltian 
collection belongs, however, to the Atlantic CV. trilineata]. 
Solecurtus lucidus [is almost certainly the young of no. 12. The amount of 
obliquity in the internal rib is extremely variable in the adult qa 
mel., teste 
Hds. in Mus. Cum. Mr. C.’s “ grandis, var.” from Monterey, suits in its 
proportions for the adult of S. luwcidus. The shell has been widely distri- 
tate by commerce, and appears to extend far in a northerly direction, The 
animal is very beautifully fringed]. 
Solecurtus Californianus [=S8. Dombeyi, teste Mus. Cuming: non Hanl. MS.]. 
Psammobia Pacifica [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.}. 
Sanguinolaria Californiana [= Macoma inconspicua, Brod. & Sby., and is a 
northern species |. 
Sanguinolaria rubroradiata {is the young of a large species of Psammobia), 
Tellina alta { =(from types) ?Serobicularia biangulata, Cpy.], 
[= Macoma edulis, Nutt.; a northern variety of MZ. secta, no, 25, and quite 
distinct from MM. edentula. | 
The locality is not confirmed, and is probably erroneous. 
[Dr. Gould considers his D. obesus a distinct species; from a large series, it 
hese 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., olim. } 
thes identical. | 
300. Petricola carditoides [with P. arcuata+cylindracea, Desh., are varieties of P. 
32. 
33. 
34. 
35, 
36. 
37. 
Californica. The series preserved in the Smithsonian Museum connects all 
the extreme forms]. 
Mysia tumida, Cony, MS. [ = Diplodonta orbella, G1d., and belongs to the section 
Spherella, Cony. The label had been assigned by accident to a young valve 
of a Chione, probably from the Sandwich Is. }. 
Tapes staminea, {This is the extreme southern form of a widely diffused and 
yery variable species, of which the normal condition is Saxidomus Petitit, 
Desh.,= Venus rigida, Gld. pars. The principal varieties have been named 
Tapes diversa, Shy.= Venus mundulus, Rye., and Venus ruderata, Desh. | 
[The Californian 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 8. Nadtallii, Conr. Some of Mr. Nut- 
tall’s specimens were, however, the young of S, aratus, of which the adult 
was not known till very recently. | 
[The young of this Pachydesma is “ Trigona stultorwm, Gray,” Desh, MS, in 
British Museum. | 
Cytherea callosa | =C. nobilis, Rve. Ttis not a Dosinia, but the type of anew 
subgenus, Amuiantis, differing from Callista as Mercenaria does from Venus]. 
Plate 19, fig. 16 (not 14 nor 15). [The true Venus Nuttallii of Conv. (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. 
Californiensis, Brod.,=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 of Stutchburyi, fluctifraga, &e. Ifreally 
distinct from the latter, it may stand as Chione callosa, Shy. jun. (non Conr.) | 
38, Venus Californiana [(teste Conr. ips.) was intended for V. Californiensis, 
Brod, Not haying access to the type, it could hardly be recognized by the 
