ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 



663 



461. Monoceros engonatum, Conr.=unicarinatum, Sby. Brown-dotted, with sharp 



posterior keel, smoothish. Beach, Cp. 

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



462. Monoceros lapilloides, Conr.=j9WHefotfMm,Gray-f brevidens, Com-. Not should- 



ered : shape of lapillus. 



463. Ocinebra lurida, Midd. (Genus reconstituted for Muricoid Purpurids with 



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



Cat. Is. living. Cp. 



463b.Ocinebra 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, Gmo[.=:monodon, Esch. Large, with winged varices. 



467. Cerostoma Nuttallii, Conr. Smaller, pear-shaped : interstices scarcely sculptured. 



468. Cerostoma monoceros, Sby. Spire raised : whirls rough, rounded. 



469. Chorus Belcheri, Hds. Sulph. Very large, with irregular varices like Trophon. 



L. w. com. Cp. 



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



with Purpuroid operc. 



471. Pedicularia Californica, Newc. Small, purple, highly sculptured. 



Family Muricida. 



472. Pteronotus festivus, Hds. Sulph. Form irregular ; frills reflexed. 



473. Muricidea Calif arnica, Hds. Sulph. Varices faintly developed. L.w.-20fm. Cp. 



474. Trophon multicostatus t Esch. = Guaneri, Lov. live. Frills spiny behind : not 



sculptured spirally. Circumpolar. 



Trophon Orpheus, Gld. E. E. Like the iasfe, with distant spiral riblets. 

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

 Siphonalia Kdlettii, Fbs. P. Z. S. 1850, p. 274. Very lai 



475. 

 476. 

 477. 



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



478. Siphonalia fuscotincta, n. s. Like the same in extreme miniature. 



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



and delicate sculpture. 120 fm. dead, Cat. Is. Cp. 



4.80. Chrysodomus liratus, Mart. = dccemcostatus, Midd. (? Say) = MiddendorffH, Coop. 

 Swollen, with distant keels. Whidby's Is. 



149 



