ON MOLLTJSCA OF THE WEST COAST OP NORTH AMERICA. 



663 



461. Monoceros engonatum, GaDi.=unioarinatum, Sty. Brown-dotted, -with sharp 



posterior keel, smootliish. Beach, Cp. 

 4616. Monoceros ?var. spiratum (Blainv.). Light coloiu- ; scaly; horn not developed. 



462. Monoceros lapilloides, Coxa:.=punctatmn,Gtia,j-]-brevidens, Com-. Not should- 



ered : shape of hpiHus. 



463. Ocinebra lurida, mdd. (Genus reconstituted for Muricoid Purpmids with 



irregular varices.) Like canaliadata, brown, with swelling ribs. Beach on 



Gat. Is. living. Cp. 

 4SSb.0cinebra var. aspera, Baird. Sculpture rough. 

 463 c. Ocinebra var. munda. Tall, with faint sculpture. 



464. Ocinebra interfossa, n. s. Purple-brown, with latticed sculpture. 



465. ? Ocinebra Poulsoni, Nutt. Shape like M. monoceros, with brown spiral lines. 



466. Cerostoma foliatum, Gmel. =moreorfoM, Bsch. Large, with winged varices. 



467. Cerostoma NuttaUii, Com-. Smaller, pear-shaped : interstices scarcely sculptured. 



468. Cei-ostoma monoceros, Shy. Spii-e raised : whu-ls rough, rounded. 



469. Chorus Belcheri, Hds. Sulph. Very large, with in-egular varices like TropTum. 



L. w. com. Op. 



470. Nitidella Gouldii, Cpr. P. Z. S. 1856, p. 208. Slender : like thin A. gausapata, 



with Purpuroid operc. 



471. Pedicidaria Califomica, Newc. Small, purple, highly sculptured. 



Family Muricidee. 



4/72. Pteronotus festivus, 'S{AM.Q^i).■oh.. Form irregular ; frills reflexed. 



473. Murieidea Calif omioaj'H.A.s.ani'^la.. Varices faintly developed. L.w.-20fm. Qj. 



474. Trophon mM&eostote, Esch. = (rMrtneci, Lov. Rve. Frills spiny behind : not 



sculptui'ed spirally. Circumpolar. 



475. Trophon Orplieus, Gld. E. E. Like the last, with distant spiral riblets. 



476. Trophon triangulatus, n. s. Typhoid shape : frills triangular, white. 60 fm. Cp. 



477. Siphonalia Kellettii, Fbs. P. Z. S. 1850, p. 274. Very large, tunited, with 



swollen whirls. Also Japan. 1 living 6| in. long. 



478. Siphonalia fusootincta, n. 8. Like the same in extreme miniature. 



479. Chrysodomus tabulatus, Baird, P. Z. S. 1863, p. 66. Large, with posterior keel, 



and delicate sculpture. 120 fm. dead. Cat. Is. Op. 



480. Chrysodomus liratus, Mart. = decemcostatus, Midd. (? Say) = Middendorffii, Coop. 



Swollen, with distant keels. Whidby's Is. 



149 



