372 
ZOOLOGY. 
in. I obtained the most perfect adhering to rocks below low water, in a place where they 
were not likely to be rolled. Those found on oyster-beds are usually smooth, even when quite 
small. 
"The form, also, seems to vary considerably in different localities; some from Puget Sound 
being much larger and more elongated, though found also of the usual form near by." — J. G. C. 
PURPURA OSTRINA. 
Purpura ostrina, Gould, Expl. Exped. Shells., p. 244. — Idem Atlas, fig. 310; Carp. Rep. p. 340. 
"Purpura Freycinetii" Middend.; non Desh. 
Purpura decemecostata, Midd. Beitrage II, 116; pi. ix, f. 1, 2, 3. 
Hah. — Straits of Fuca ; Puget's Sound; Dr. Cooper. 
Quite a difl'crent species from F. Frcycinetii, of Deshayes, with which it was confounded by 
Middendorff, though he also named and described it as new. Whether his or Dr. Gould's 
name has the priority I have not the means of deciding. On rocks above low water mark, 
from the mouth" of Hood's Canal to Straits of Fuca; common. 
PURPURA LAPILLUS. 
Purpura lopillus, Linn, Midd. Gould, Carpenter; op. cit. 
Hah. — Sitka Ochotsk ; White sea ; Middendorff. Straits of Juao de Fuca ; Puget's Sound ; Dr. Cooper. 
Equally common with the last species, and found together with it. 
PURPURA EMARGINATA. 
Purpura eniarginala, Desh. Eev. Zool. 1839. — Magasin de Zool. Moll. pi. 25; 1841. — Eeeve, C. I. Pruss. x, p. 46. ~ 
Carp. Rep. p. 340. 
Purpura Conradi, Nutt. Mss., Jay's Catal. No. 8972. 
Uih. — Upper California: Dr. Trask. San Diego ; Lieut. Trowbridge. 
This shell is, no doubt, a California species, whence several were sent by Dr. Trask. Mr. 
Reeve mentions specimens in the British Museum, collected by Mr. Nuttall in that country. 
There is probably an error in M. Deshayes statement that it inhabits New Zealand. 
MONOCEROS ENGONATUM. 
Pwpura {Manoceros) engonata, Conr. in Journ. Acad. Phila. VII, p. 26 ; pi. 20, p. 17. 
" Monoceros engonatum, Conr." Carp. Report, p. 201. 
" Monoceros unkarinatum, Reeve, C. I. sp. 1 ; new, pi. I, f. 1 ; nee syn. pi.; non Sowb. nee. Desh." — Carp. Rep. 201. 
" ifonoceros unicari'naiMm, SowB. var." Jat, Cat No. 9067. N. B. — The type is quoted by Dr. Jay as synonymous 
with Purpura spirata, Blainville 
Hab. — Bay of San Pedro, Upper California; Dr. Trask. Santa Barbara ; Nuttall. 
From the above citations, which might be further extended, it will be seen that there is much 
difference of opinion concerning the synonymy of this species. Our specimens, of which four 
were sent by Dr. Trask, agree entirely with Mr. Conrad's figure and description. They differ 
materially from Kiener's figure of Purpura spirata from the Sandwich Islands, and still more 
from Reeve's figure 2, specimen 1, of his plate I. At the same time they are possibly identical 
as species. This was first published by Mr Conrad in 1837. 
