No. 6. 

 REPORT UPON THE MOLLUSCA COLLECTED ON THE SURVEY. 



BY WILLIAM COOPER. 



Class MOLLUSCA .—Shell-fish. 



Family MURICIDAE. 

 MUREX FOLIATUS. 



ilurex /oliatm, Gmf.l. Desh. Keeve, C. J. Ill, 12. 



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

 Cerastoma mmodon, Cakpenter, Eeport to Brit. Assoc. 1856, p. 345. 

 Ceroitvma foliaium, Idem 1. c. 

 Uab. — Sitcha ; Eschscholtz. Oregon ; Kellett anil Wood in Caip. 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 PESTIVUS. 



Alurex festivus, Hinds, ZooI. Sulphur, pi. 3, f. 13, 14. — Reeve, C. I. Murex, pi. xxvi, f. 114, 

 Pteronotus fesiivus, Carp. Rtp. 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. 



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

 Trilanium (Bucdnum) cancellatum, Middendorff, Beitrage, 11, p. 164, pi. Ill, f. 1-4, (adult and young,) excl. syn. 



Lam. 1849. 

 Fus>ii oregonenm, Reeve, C. I. pi. xvi, p. 61, (young,) 1845. 

 Fusm cancdlatus, Keeve, 1. c, p. 62, (adult.) 

 Triton oregomnse, Gould, U. S. Expl. Exped. Moll. S Shells. 

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

 Hab. — Straits of Juan de Fuca ; Dr. Suckley, Mr. Gibbs, Dr. Cooper. Unalasbka ; 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 



