530 REPORT—18638. 
have been corrected by Dr. Gould himself, in his ‘ Otia Conchologiea,’ 
Boston, 1862, which contains the various papers in the ‘Proceedings of the 
Boston Soc. of Nat. Hist.,’ with an appendix. After the organization of the 
Smithsonian Institution, all the natural-history collections belonging to the 
Federal Government were transferred to its keeping, with liberty to exchange 
duplicates. The shells remained unopened, and the types not accessible, till, 
at the request of Professor Henry, I undertook the arrangement of the col- 
lections. Fortunately, a considerable part of the shells professing to be 
the figured types of the new species were found together, with the artist’s 
marks corresponding with the plates and figures. The result of the exami- 
nation, so far as the general collection is concerned, will shortly be prepared 
for the press; it is sufficient here to tabulate the observations on the N.W. 
American species, which were, as it happened, the most satisfactorily pre- 
served in the whole series. The following additional particulars include the 
“‘ Rectifications ” in the ‘ Otia,’ the paging of which is continued from the 
‘«« Expedition Shells ” quoted in Rep. p. 209. The quarto volume quoted in 
p. 210 is distinguished as “ E. E. Mollusca.” The folio atlas of plates bears 
date on title 1856, but was not published till 1861, teste Binn. Bibl. vol. i. 
p- 504. The comparisons of types were made in 1860, from a proof copy. 
Otia, Page. 
3. Chiton lignosus=[Mopalia| Merckii, Midd., test. Gld. E. E. Moll. [from 
worn specimens := Ch. Montereyensis, Cpr., from perfect shells. 
230. Chiton (Chetopleura) vespertinus. Perhaps=Ch. lignosus, var. [A Mo- 
palia, differing slightly in the amount of posterior wave. The fig. in 
E. E. Moll. is made-up from broken specimens. } 
6, 242. Chiton (Onithochiton) dentiens. [The shell sent as type of this species, 
and all the others seen from the coast, agree in belonging to Ischnochiton, 
and are not dentate, as would be presumed from the figures and diag- 
nosis. As Dr. Gould’s toothed Onithochiton may hereafter be found, the 
Smithsonian shells have been named Isch. pseudodentiens. | 
6, 242. Chiton (Chetopleura) muscosus. [= Acanthopleura muscosa, H. & A. Ad. 
Gen.,= Ch. ornatus, Nutt. P. ZS. 1855, p. 232,14 Mopalia consimilis, 
Nutt. MS. in B, M. This beautiful species is a true Mopalia. 
230. Chiton (Leptochiton) interstinctus. Resembles C. Sitchensis, Midd. { = Cal- 
lochiton 7.,H. & A. Ad., Gen. It is a true Ischnochiton. The genera of 
Chitonidz cannot always be ascertained by external characters alone, as 
indicated in Messrs. Adams’s genera, All the species in the Smithsonian 
Museum have been dissected. 
7, 242. Patella (Tectura) fimbriata= P. cinis, Rve. [=Acmea pelta, Esch. }. 
9, 242. Patella (Nacella) instabilis, {Varies greatly in proportions. | 
9, 242. Lottia (Lectura) pintadina. {The types represent the normal condition of 
Acmea patina. One variety is A. cribraria, Gld. MS. The speci- 
mens of A. mesoleuca intermixed by Dr. G.in the Mexican War collec- 
tions were, no doubt, affiliated by an oversight. | 
10, 243. Patella (Tectura) textilis is a var. of T. persona, Esch. [A well-marked 
form of delicate growth, passing from A. persona into <A. pelta, var. ; 
from the young of which some specimens can hardly be distinguished, 
except by the fretted pattern. ] 
10, 248, Patella ( Tectura) scabra=spectrum (Nutt.), Rve., not scabra (Nutt.), Rve. 
[The tpe-shepvants belong to two species, f. 456, 456a, being A. spec- 
trum, Nutt., while 456 represents the flattened variety of -4. persona, 
Esch. (approaching the form digitalis, Esch.). As the diagnosis best 
accords with the latter shell, P. seabra, Gld., may stand as a synonym of 
persona, var. ; the intermixed specimen, accidentally figured as belonging 
to the species, being removed to spectrum, Nutt. Thus the name scabra, 
not being needed as first described, will remain for Nuttall’s species, 
described by Rve., but first named in print by Jay. | ; 
