No. 6. 

 REPORT UPON THE MOLLUSCA COLLECTED ON THE SURVEY. 



/ 



BY WILLIAM COOPER. 



Class MOLLUSCA. Shell-fish. 



Family MUBICIDAE. 

 MUREX FOLIATUS. 



Murex foliatus, GMEL. Desh. Reeve, C. J. Ill, 12. 



Murex monodm, ESCH. Zool. Atlas, Pt. II, p. 10, pi. 9, 10, f. 1, 1829. 

 Cerastoma monodon, CARPENTER, Report to Brit. Assoc. 1856, p. 345. 

 Cerat/oma foliatum, IDEM 1. c. 

 tlab. 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 b 

 also found living, and some very remarkable species that have not, these specimens have 

 appearance of fossil shells. Eschscholtz collected it at Sitcha, in lat. 58, as quoted by Re< 

 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. 

 Pteronotus festivus, CARP. Rep. Brit. Assoc. 1856, p. 345. 

 Hob. Bay of Magdalena ; Hinds. San Diego ; Mr. Cassedy. 



This well marked species, which was dredged alive by Mr. Hinds in the Bay of Magdali 

 is found of much larger size at San Diego. Only dead shells were sent, appearing like fc 

 or much weathered shells, but otherwise they entirely agree with Reeve's figure. 



TRITON OREGONENSE. 



Triton oreffonense, REDFIELD, in Ann. Lyceum of Nat. Hist, of New York, IV, p. 165, pi. II, f. 2, (young?) 1839. 

 Tritonium (Buccinuni) cancellation, MIDDENDORFF, Beitrage, II, p. 164, pi. Ill, f. 1-4, (adult and young,) excl. 



Lam. 1849. 



Fusus oregontnsis, REEVE, C. I. pi. xvi, p. 61, (young,) 1845. 

 Fusus cancdlatus, REEVE, 1. c, p. 62, (adult.) 

 Triton oregonense, GOULD, U. S. Expl. Exped. Moll. & Shells. 

 Triton cancdhtum, (oregonense, ) CARP. Rep. p. 338. 

 Sab. Straits of Juan de Fuca ; Dr. Suckle} , Mr. Gibbs, Dr. Cooper. Unalashka ; Middendorff. Kamtschatka ; Reev 



Among the specimens from the Straits of De Fuca is one adult shell, exhibiting the toot] 

 fold on the upper part of the columella, as it appears in MiddendorfTs plate, the absenc 

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