Califorr^ia Art ^ Natiare 



WEST AMERICAN MOLLUSCA. 



BUCCINUM ALEUTICUM Dall. 



"Shell thin, 6 whorled, covered by a 

 thin sparsely pilose, dehiscent epider- 

 mis; of a livid pinkish color with a white 

 pillar and margin to the outer lip and a 

 dark chestnut nucleus; sculpture of ex- 

 tremely fine, regular, close-set grooves 

 with equal or wider interspaces, regular- 

 ly spaced on the last, but tending to 

 pair on the earlier whorls; spire short 

 rather pointed; whorls full; suture deep 

 but not channelled; aperture moderate; 

 pillar with a white callous ridge incurv- 

 ed upon it; siphonal fasciole distinct, 

 bounded by a groove behind; outer lip 

 slightly thickened, hardly reflected; 

 throat livid brown; operculum small, 

 subcircular with a subcentral nucleus 

 and fan-shaped scar of attachment. 

 Length of shell, 35; maximum diameter, 

 21 mm." — Dall, U S Na Mu pr 17:706, t 

 27 f 7 (1894). South of Unimak Island, 

 Aleutians, in 59 fathoms, sand. 



B. OVUI.UM Dall. 



"Shell small, thin, of about 4^^ or five 

 whorls; surface smooth, or with faint ir- 

 regular spiral threads mostly obsolete; 

 covered with a vernicose adherent olive- 

 green epidermis; substance of the shell 

 livid pinkish purple, with a white mar- 

 gin to the pillar and aperture; last whorl 

 much the largest; suture deep but not 

 channelled; nuleus eroded in all the sp.; 

 pillar nearly straight, thin, with a deep. 



very short, hardly recurved canal; body 

 sometimes with a thin wash of yellowish 

 callus; operculum small, nearly circular, 

 the nucleus subcentral, surface of 

 attachment fan-shaped, reflected by a 

 depression in the concave outer surface. 

 Length of shell, 25; maximum diameter, 

 20 mm." — Dall 1. c. 707 t 30 f 6. 



B. STRIGILLATUM DalL 



"Shell with 7 fully rounded whorls, 

 deep suture, and hirsute epidermis 

 sculpture of numerous narrow flattened 

 primary ridges with subequal channell- 

 ed interspaces; aperture not expanded 

 but with a wide deep sinus near the 

 houlder. Color white; length 42, breadth 

 27 mm. U.S. Steamer Albatross, station 

 3170, off Guadelupe Island, Lower Calif- 

 ornia, in 167 fathoms." — Dall 1. c. 14:186 

 (1891); 17:706 t 27 f 9. Off Tahwit Head, 

 Washington, in 178 fathoms; and off" Bo- 

 dega Head, Cal. 167 fm., muddy bottom. 



B. TAPHRIUM DaU. 



"Shell thin, slender, with polished 

 brown epidermis, with fine spiral striae 

 and conspicuous zigzag or spiral mallea- 

 tions; 6-whorled, acute; suture deeply 

 channelled; aperture white, with thick 

 reflected lip and continuous thick callus 

 on the concave pillar. Length of shell 

 40, breadth 18, length of aperture 15 

 mm. U. S. Steamer Albatross, station 

 3330, off Akutan Island, Bering Sea, A- 

 laska, in 351 fathoms." — Dall I.e. t 29 f 6. 



