530 REPORT — 1863. 



have been corrected by Dr. Gould himself, in his * Otia Conchologica,' 

 Boston, 1862, which contains the various papers in the 'Proceedings of tne 

 Boston Soc. of Xiit. 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 tj-pes 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, svUl 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 ia 

 p. 210 is distinguished as " E. E. Mollusca." The folio atlas of plates bears 

 date on title 1856, but was not published till 18G1, teste Binn. Bibl. vol. i« 

 p. 504. The comparisons of types were made in 1860, from a proof copy. 



Otia, Page. 



3. Chiton lignoxiis^-l^Mopalict] 3Ierckii, Midd., test. Gld. E. E. Moll, [from 

 worn specimens := Ch. 3Iontereyensis, Cpr., from perfect shells.] 

 230. Chiton {ChfBtopleura) vespertiims. Perhaps =CA. liffnosus, \ar. [A 3/o- 

 palia, difiering slightly in the amount of posterior wave. The fig. in 

 E. E. Moll, is made-up from broken specimens.] 



6, 242, Chiton (Onithochiton) dcntiens. [The shell sent as t}"pe 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 dia<r- 

 nosis. As Dr. Gould's toothed Onithochiton may hereafter be foimd, the 

 Smithsonian shells have been named Isch. pseudodentienK.'\ 

 ♦, 242. Chiton (Chcftopleura) miiscosus. \^ = Acanthoplvura inuscosa, II. & A. Ad. 

 Gen.,= CA. omafm, Nutt. P. Z. S. 1855, p. 2S2, + Mopalia consiinilis, 

 Nutt. MS. in B. M. This beautiful species is a true Moj>alia.~\ 

 230. Chiton (Leptorhiton) interstindus. Resembles C. Sit/'hmsis, Midd. [=Cal- 

 lochiton i., H. & A. Ad., Gen. It is a true Ischnochiton. The genera of 

 Chitonidae cannot always be ascertained by external characters alone, as 

 indicated in Messrs. .Vdams's genera. All the species in the Smithsonian 

 Museum have been dissected.] 



7, 242. Patella {T<'ctura)Jimhriata=P. ctni Rve. [^=:Acmeea pelfa, Each.]. 

 9, 242. Patella (Nacella) instahi/is. [Varies greatly in proportions. I 



9, 242. Lottia (Tectura) jnntadina. [The types represent the normal condition of 

 Acnuea patina. One variety is A. eribraria, Gld. MS. The speci- 

 mens of A. fnesjkuca intermixed by Dr. G. in the Mexican War collec- 

 tions were, no doubt, affiliated by an oversight.] 



10, 243. Patella {Tectura) teutilie is a var. of T. persona, Esch. [A well-marked 

 form of delicate growth, passing from A. persona into A. peltn, var. ; 

 from the young of which some specimens can hardly be distinguished, 

 except by the fretted pattern.] 



10, 243. Patella ( Tectura^ scabra^spectntm (Nutt.), Rve., not scabra (Nutt.), Rve. 

 [The type-specimens belong to two species, f. 456, 466a, being A. spec- 

 trum, Xutt., while 450i represents the flattened variety of A. persona, 

 Escli. (approaching the form digitalis, Esch.). As the diagnosis best 

 accords with the latter shell, P. scabra, Gld., may stand as a synonym of 

 persona, var. ; the intermixed specimen, accidentallv figured as belonging 

 to the species, being removed to siwctrum, Nutt. Thus the name scabra, 

 not beinsr needed as first described, will remain for Nuttall's species, 

 described by live., but firet named in print by Jay.] 



16 



