g 
ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 597 
work had been carelessly printed.) It contains the following species, the 
localities quoted in the text from other sources being here omitted :— 
Page. 
369, “aso Soa Gmel.,= VM. monodon, Esch. (Cerostoma). San Diego, ? fossil, 
‘assidy. i 
» Murex festivus, Hds. Dead. San Diego, Cassidy. 
» Triton Oregonensis, Redfield (non Jay, nec Say) = T. cancellatum, Midd., 
Rye., non Lam. Straits of De Fuca, Suckley, Gibbs, J. G. Cooper. 
370. Chrysodomus antiquus, var. Behringiana, Midd., one specimen. Straits of De 
Fuca, Suckley. [Comp. Chr. tabulatus. ] 
»  Chrysodomus Middendorffii, Coop., n. s.,= Tritonium decemcostatum, Midd. 
One specimen on the shore of Whidby’s Island. Straits of De Fuca, J. G. 
Cooper. [= Buc. liratum, Mart. This being a remarkable instance of a 
“representative species,” it requires to be minutely criticized. Judge 
Cooper compared his specimen with 130 eastern shells, and noted the difter- 
ences with great fulness and accuracy. <A series of Middendorff’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 furnished me by Judge Cooper and other most trusty naturalists. 
According to the diagnosis of Middendorffit, it should be referred to C. de- 
cemcostatus, Say, and not to the De Fuca species, as it agrees in all respects 
with 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 from the N. W. coast, sent to the Smiths. Inst. by Mr. Pease, and with 
the same result. On examining the specimens in the Gaaiwit Collection, 
in company with A. Adams, Esq., we were both convinced that the eastern 
and western forms céuld 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. [ =incisus, Gld.,=dirus, Rve.]. Str. De Fuca, 
Suckley, Gibbs. 
»  Nassa mendica, Gld. Puget Sound, Suchkley. 
»  Nassa Gibbsii, Coop.,n.s. “ Resembles J. trivittata more than N. mendica.” 
Port Townsend, Puget Sound. [In a large series, neither Dr. Stimpson nor 
I were able to separate this species from N. mendica. Similar variations 
are common in British Nasse. Picked individuals from the Neeah Bay 
series would probably be named ¢rivittata, if mixed with eastern shells. ] 
» Purpura lactuca, Esch.,+ WM. ferrugineus, Esch.,= P. septentrionalis, Rve. 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 
ae ., non} Midd. Rocks above low-water mark ; from mouth of Hood’s 
cull to Str. Fuca; Puget Sound, common, J. G. Cooper. 
» Purpura lapillus [Coop., non] Linn. [=P. saxicola, Val.] Str. De Fuca, 
Puget Sound, J. G. Cooper. “ Found with P. ostrina, and equally common.” 
[Some varieties run into the New England form of P. lapillus, sufficiently 
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. ostrina, Gld., which is a rare and extreme variety. Many of the 
shells called P. Freycinetit by Midd. are certainly referable to this species. 
Some forms pass towards the true P. Freycineti, Desh., while others are 
equally close to the very different P. emarginata, Desh. ] 
9» Purpura emarginata, Desh.,=P. Conradi, Nutt. MS. “Upper California,” 
Trask; San Diego, Trowbridge. [This appears to be exclusively a southern 
form = saxicola, var. | 
5 Monoceros engonatum, Conr.,=M. unicarinatum, Sby. San Pedro, Dr. Trask. 
373. Monoceros lapilloides, Conr.,= M, punctatum, Gray. San Pedro, Dr. Trask, 
