ON MOLLUSCA OF THE WKST COAST OF NORTH AMERICA. 



663 



461. 



4616 

 402. 



403. 



46". 6 



40:', c, 



404. 



40.-). 



^00. 



407. 



40S. 



409. 



470. 



471. 



Monoceros engonatum, Conv. = vnicarinatum, Sby. Brown-dotted, with sharp 

 posterior keel, smoothish. Beach, Cp. 



Jlo/ioceros ?\'iiv. spiraftnn (JUamv.). Light colour; scaly; horn not developed. 



Monoceros lapilloides, Coni:= 2}unctattan,Ch"Ay-\-brecidens, Conr. Not should- 

 ered : shape of lapillus, 



Ocinebra lurida, Midd. (Genus reconstituted for Muricoid Pui-pmids with 

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

 Cat. Is. li\ing. Cp. 



Ocineh:-a var. aspera, Baird. Sculpture rough. 



Ocinebra var. munda. Tall, wnth faint sculpture. 



Ocineb a interfossa, n. s. Purple- brown, with latticed sculpture. 



? Ocinebra Poulsoni, Nutt. Shape like M. monoceros, ^y\i\\ brown spiral lines. 



Cerostoma foliatnm, Gniel. = »io«of/y«, Esch. Large, vrdh winged varices. 



Cerostoma Nutt aim, Conr. Smaller, pear-shaped: interstices scarcely sculptiu'ed. 



Cerostoma monoceros, Sby. Spire raised : whirls rough, i-ounded. 



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

 L. w. com. Cp. 



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

 with Purpuroid operc. 



Pedicularia Californica, Newc. Small, purple, higlily sculptured. 



Family Muricidee. 



472. Pte7-onnti(sfestivm,'ildis.^\x\^h.. Form irregular ; frills reflexed. 



473. J/«Wc«f?ea CW//b;v«'ca, Hds. Sulph. Varices faintly developed. L.w.-20fm. CjtJ. 



474. Trophon multicostatus, ^sc\i.= Gunneri, Lov. Uve. Frills spiny behind: not 



sculptured spirally. Circumpolar. 



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



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



477. Siphonalia Krllettii. Fbs. P. Z. S. 1850, p. 274. Very large, turrited, with 



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



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



479. Chryso'lonius tabulatus, Baird, P. Z. S. 1863, p. 66. Large, with posterior keel, 



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



480. Chri/sodomus liratus. Mart. = drcemcostatus, Midd. (? Say) = Middendorffii, Coop. 



Swollen, with dislaut keeis. Whidby's Is. 



149 



