ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 597 



work had been carelessly printed.) It contains the foUowinj^ species, the 

 localities quoted in the text from other soui-ces being here omitted : — 



Page. 



369. Murex foliatus, Gmel., = il/. monodon, Esch. (Cerostoma). San Diego, ? fossil, 

 Cassidy, 

 „ Murex festivus, Hds. Dead. San Diego^ Cassidy. 



„ Triton Oreyonensis, Redfield (non Jay, nee Say) = T. canceUatum, IVIidd., 

 Rve., non Lam. Straits of De Fiica, SxcJxley, Gibbs, J. G. Cooper. 



870. CJirysodomus antiquus, var. Behrinyiana, Midd., one specimen. Straits of Do 

 Fuca, Suckley. [Comp. Chr. tabulatus.^ 

 „ Clirysodomus Middendorffii, Coop., n. s.,= Tritonium decemcostahim, Midd. 

 One specimen on the shore of Whidby's Island. Straits of De Fiica, /. G. 

 Cooper. [ = Biic. liratum, Mart. This being a remarkable instance of a 

 "representative species," it requires to be minutely ciiticized. Judge 

 Cooper compared his specimen with 130 eastern shells, and noted the differ- 

 ences with great fulness and accuracy. A series of Middendorif 's Pacific 

 shells having been brought to England by Mr. Damon, and sold at high 

 prices, I made a searching comparison of one of them with the eastern 

 specimens fui-nished me by Judge Cooper and other most trusty naturalists. 

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

 cemcostatus, Say, and not to the De Fuca species, as it agrees in all respecta 

 ynth. the eastern peculiarities quoted, except that the riblets near the canal 

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

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

 shell fi-om the N. W. coast, sent to the Smiths. Inst, by Mr. Pease, and with 

 the same result. On examining the specimens in the Cumingian Collection, 

 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.] 



371. Ckrysodomvs Sitchensis, Midd. [ = incistts, Gld., = dirus, live.]. Str. De Fuca, 



Suckley, Gibbs. 



„ Nassa mendica, Gld. Puget Sound, Sucldey. 



jy Nassa Gibbsii, Coop., n. s. " Resembles N. trivittata more than N. mendica.''^ 

 Port To\\Tisend, Puget Sound. [In a large series, neither Dr. Stimpson nor 

 I were able to separate tins species fi'om N. mendica. Similar variations 

 are common in British Nassce. Picked individuals from the Neeah Bay 

 series would probably be named triviffata, if mixed with eastern sliells.] 



ff Pui'pura lactuca, Esch. , + M. fer>):^uyineus, Esch. , = P. septentrionalis, live. Puget 

 Sound, Suckley, Gibbs ; Shoalwater Bay, Str. de Fuca, J. G. Cooper. 

 "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 young." — J, G. C. 



372. Purpura ostrina, Gld., = P. Freycinetii, Midd., non Desh. -\-P. decemcostata 



[Coop., non] Midd. Rocks above low- water mark ; from mouth of Hood'a 

 Canal to Str. Fuca ; Puget Sound, common, J. G. Cooper. 



f, Purpwa lapilltis [Coop., non] Linn. [ = -?• saxicola, Val.] Str. De Fuca, 

 Puget Soimd, J! G. Cooper. "Found with P. ostrina, and equally common." 

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

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

 distinguished by the excavated columella. They pass by insensible grada- 

 tions to P. o*'^m?o, Gld., which is a rare and extreme variet3^ Many of the 

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

 Some forms pass towards the true P. Freycinetii, Desh., while others are 

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



yf Purpura emaryinata, Desh., = P. Conradi, Nutt. MS. " Upper California," 

 Trask ; San Diego, Trowbridye. [This appears to be exclusively a southera 

 ionn = saxicola, var.] 



„ Monoceros enyonatum, Conr., = 3/. unicarinatum, Sby. San Pedro, Dr. Trask. 

 S73. 3Ionoceros lupilloides, Qoux.f^M. ijunctaium, Gray. San PediO; Dr. Trunk. 



83 



