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 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 sheUs 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 llep. 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 lignoxm = \_MopaUa'] Merchii, Midd., test. Old. E. E. Moll, [from 

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

 230. Chiton (Chesfopleura) vcupertimis. Perhaps =CA. liffnosus, xnv. [A J/o- 

 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 Iseh. pseiidodentiens.l 



6, 242. Chiton (CJicHopleara) muscosits. [= Acanthopleiira muscosa, H. & A. Ad. 



Gen.,= C7j. omatus, Nutt. P. Z. S. 1855, p. 2S2, + Mopalia consi7nilis, 

 Nutt. MS. in B. M. Tliis beautiful species is a true Mopalia. ~\ 

 230. Chiton {Leptocliitori) interstinctus. Resembles C. Sitchensis, Midd. [= Cal- 

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

 Chitonidse 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) Jimhriata= P. c{?iis, Rve. \_=: Acmaa pelta, Each.]. 

 9, 242. Patella (Nacella) instabilis. [Varies greatly in proportions.] 



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

 Acmcea 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, 243. Patella ( Tectura) scabra= spectrum (ISutt.), Rve., not scahra (Nutt.), Rve. 

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

 trum, Nutt., while 4506 represents the flattened variety of A. persona, 

 Escli. (approaching the form di(/italis, Esch.). As the diagnosis best 

 accords with the latter shell, P. scabra, 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 beino- needed as first described, will remain for Nuttall's species, 

 described by Rve., but first named in print by Jay.] 



16 



