No. 6. 

 REPORT UPON' TEE MULLUSCA COLLECTED ON THE SURVEY. 



BY WILLIAM COOPER. 



Class MOLLUSC A.— Shell-fish. 



Family MURICIDAE. 



MUREX FOLIATUS. 



MuToe fdiaius, Gmel. Desh. Reeve, C. I. Ill, 12. 

 Murex monodon, EscH. Zool. Atlas, Pt. II, p. 10, pi. 9, 10, f. 1, 1829. 

 (krastoma monodon, Carpenter, Report to Brit. Assoc. 1856, p. 345. 

 Cerastoma foliatum, Idem, 1. c. 

 Bab. — Sltcha; 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 FESTIVUS. 



Murex feslivus, Hinds, Zool. Sulphur, pi. 3, f. 13, 14. — Reeve, C. I. Murex, pi. xxvi, f. 114. 

 Pleronotus fesiivus, Chap. Rep. Brit, Assoc. 1856, p. 345. 

 Hab. — 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. 



Trilon oregonense, Eedfield, in Ann. Lyceum of Nat. His. of New York, IV, p. 165, pi. II, f. 2, (young?) 1839. 

 Trilonium (Buccinum) canceUatum, 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 cancdlalus, Keeve, 1. c. p. 62, (adult.) 

 THion oregoneme, Gould, U. S. Expl. Exped. Moll & Shells. 

 Triton canceUatum, (oregonense,) Carp. Rep. p. 338. 

 Sab. — Straits of Juan de Fuca ; Dr. Sucliley, Mr. Gibbs, Dr. Cooper. Unalastilca ; 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 

 47 Q 



