ON MOLLUSCA OF THE WEST COAST OF XORTH AMERICA. 597 



work had been carelessly printed.) It contains the following; species, tho 

 localities quoted in the text ironi other sources being here omitted : — 



Page. 



3Uy. Murex foliatm, Gme\., = M. monodon, Each. (Cerostoma). San Diego, ? fossil, 

 Cassidy. 

 „ Miirex festiims, Hds. Dead. San Diejro, Cassidy. 



„ Triton Oref/nnensis, Redfield (non Jay, nee Say) = T. cancrlhdum, ^lidd., 

 Rve., non Lam. Straits of De Fuca, Siwk/cy, Oibbs, J. (i. Coopt'-. 



870. Clirysudomus antiquutt, var. Bvhrinyiann, Midd., one specinieu. Straits of Da 



Fuca, Suckley. [Conip. Chr. tahidattts.] 

 „ Chrysodomus Middendorffii, Coop., n. a.,— Tritonium decemcosfafmn, Midd. 

 One specimen on the shore of Wbidby".s Island. Straits of De Fuca, J. G. 

 Cooper. [ = Btic. liratum, Mart. Tliis being: a remarkable instance of a 

 " representative species," it requires to be minutely criticized. Judtie 

 Cooper compared his specimen -wnth 1.30 eastern shells, and noted the dirt'er- 

 ences with great fulness and accuracy. A series of Middendorll's I'acilic 

 shells having been brought to Enirland by Mr. T)anion, and sold at high 

 prices, I made a searching coT>i])av''i'->n of one of them with the eastern 

 specimens furnished me bv Judge Cooper and other uio.st trusty naturalists. 

 According to the diagnosis of .Middnidorffii, it should be referred to C. de- 

 cemcmtitusj Say, and not to the De Fuca species, as it agrees in all re.^pecta 

 with the eastern peculiarities quoted, except that the riblets near the canal 

 are rather more numerous and deiined. As it might be suspected that 

 Mr. Damon's shells were mixed, I have made a similar comparison with a 

 shell from the N. W. coast, sent to the Snuths. Inst, by Mr. Pease, and with 

 the same result. On examining the specimens in the Cuniingian C'dllection, 

 in company with A. Adams, Esq., we were both convinced that the eastern 

 and western forms could not be separated. In the similar shells collected 

 by Mr. Adams in the Japan seas there are remarkable variations in the de- 

 tails of sculpture.] 



871. Chrysodomus Sitchensis, Midd. '\_ = incisits, Gld., = rf<Vi/s, live.]. Str. De Fuca, 



Suckley, Gibhs. 



„ Nassa ynendica, Gld. Puget Sound, Surlley. 



„ Xassn Gibbsii, Coop., n. s. " Resembles X. trivitfata more than N. jnmdica.^^ 

 Port Townsend, I'uget Sound. [In a large series, neither Dr. Stimpson nor 

 I were able to separate tins species from N. mtndica. Similar variatiims 

 are common in British Xassce. Picked individuals trom the Neeah Day 

 series would probably be named trivitf<d<i, if mixed with eastern shells.] 



I, Purpura lactuca, ¥.sch., + M. fep^ugineus,K9i:}i., = 1'. septciitridnali.i. I've. Puget 

 Sound, Suck/ey, Gibhs; Shoalwater Bay, Str. de Fuca, J. G. Conprr. 

 " Abounds on rocks and oyster-beds in Shoalwater Bay, the form and 

 amount of rugosity depending on station. The oyster-eaters are smooth 

 even when yountr.^' — J. G. C. 

 372. Purpura osfrina, Gld., = P. Freycinetii,Widd., non Desh. -{- P. decemcosfafa 



tCoop., non] Midd. Rocks above low-water mark : from mouth of llood'a 

 'anal to Str. Fuca ; Puget Sound, common, J. G. Conner. 



f, Pirpwa lajnllus [Coop., non] Linn. \_ = P- saricohi,\A\.^ Str. De Fuca, 

 Puget Sound,/. G. Coojier. "Found with /'. uxtrina, and equally common."' 

 [Some varieties run into the New England form of P. lapillus, sulHcientlv 

 nearly to justify the identification; but the bulk of the specimens are easily 

 distinguished by the excavated columella. They pass bv insensible graila- 

 tions to P. o«^nwff, Gld., which is a rare and extreme variety. Many of the 

 shells called P. Freycinetii by Midd. are certainly referable to this sjwcies. 

 Some forms pass towards the true P. Freycinetii. D(>sh., while others are 

 equally close to the very different P. emaryiitata, Desh.] 



„ Purpura emaryinata, Desh., = P. Conradi, Nutt. MS. " Upp'^r California,'' 

 Trusk; San Diego, Trowbridge. [This appears to be exclusively a southern 

 form = sajrieola, var.] 



„ Monoceros enyonatum, Conr., = Jlf. ttnicarinntvm. Sby. San Pedro. Dr. Trn^k 

 S73. Momcwoi, layiUuidvs, Cijut.,^Jl. ^unctatum, Giaj-. fcan I'tdio, iJr. Tra^k. 



83 



