No. 6 
REPORT UPON'THE MULLUSCA COLLECTED ON THE SURVEY. 
BY WILLIAM COOPER. 
Class MOLLUSC A.—Shell-fish. 
Family MURICIDAE. 
MUREX FOLIATUS. 
Murex foliatus, Gmel. Desh. Reeve, C. I. Ill, 12. 
Murex monodon, Esch. Zool. Atlas, Pt. II, p. 10, pi. 9, 10, f. 1, 1829. 
Cerasloma monodon, Carpenter, Report to Brit. Assoc. 1856, p. 345. 
Gerastoma foliaium, Idem, 1. c. 
Bab. —Sitcha; Eschscholtz. Oregon ; Kellett and Wood in Carp. p. 241. San Diego, (fossil?); Mr. Cassedy. 
Sent from San Diego by Mr. Cassedy. Like others from the same locality which have been 
also found living, and some very remarkable species that have not, these specimens have the 
appearance of fossil shells. Eschscholtz collected it at Sitcha, in lat. 58°, as quoted by Reeve, 
though the name he gives is omitted by the latter. 
MUREX FESTIYUS. 
Murex festivus, Hinds, Zool. Sulphur, pi. 3, f. 13, 14.— Reeve, C. I. Murex, pi. xxvi, f. 114. 
Pleronotus feslivus, Chap. Rep. Brit, Assoc. 1856, p. 345. 
Bab. —Bay of Magdalena ; Hinds. San Diego ; Mr. Cassedy. 
This well-marked species, which was dredged alive by Mr. Hinds in the Bay of Magdalena, 
is found of much larger size at San Diego. Only dead shells were sent, appearing like fossil or 
much weathered shells, but otherwise they entirely agree with Reeve’s figure. 
TRITON OREGONENSE. 
Tritonoregonense, Redfield, in Ann. Lyceum of Nat. His. of New York, IV, p. 165, pi. II, f. 2, (young?) 1839. 
Triionium (Buecinum ) cancdlatum, Middendorff, Beitrage, II, p. 164, pi. Ill, f. 1-4, (adult and young,) excl. syn. 
Lam. 1849. 
Fusus oregonensis, Reeve, C. I. pi. xvi, p. 61, (young,) 1845. 
Fusus cancellatus, Reeve, 1. c. p. 62, (adult.) 
Triton oregonense, Gould, U. S. Expl. Exped. Moll & Shells. 
Triton cancellatum, ( oregonense ,) Carp. Rep. p. 338. 
Bab. —Straits of Juan de Fuca ; Dr. Suckley, Mr. Gihhs, Dr. Cooper. Unalashka ; Middendorff. Kamtschatka ; Reeve. 
Among the specimens from the Straits of De Fuca is one adult shell, exhibiting the tooth or 
fold on the upper part of the columella, as it appears in Middendorff s plate, the absence of 
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