178 
2617 Astrea inzqualis 
Synonymy:—Pachypoma ineequale Mart. 
2618 Axinopsis viridis Dall. 
Japan.—Bering Sea.—Catalina Island, Cal., in muddy or 
sandy bottoms; shell about 6 mm. across, with a polished pale 
green periostracum, 
2619 Axinopsis sericatus Cpr. 
Alaska to California. 
2620 Genus Bathytoma 
This seems to be the latest name for the shells named previ- 
ously under Pleurotoma (Genota), which see for list of species. 
2621 Bathytoma Keepi Arnold. 
Coalinga, Cal. (fossil). 
2622 SBittium acicula Stimp. 
2623 Bittium armillatum ornatissimum Bartsch. 
2624 + SBittium esuriens 
2625 + Bittium fortior Cpr. 
2626 Bittium munitum munitoides Bartsch. 
2627 Bittium Oldroydii Bartsch. 
The above are some of the minute Californian shells, described 
mainly in recent years. 
2628 SBoreotrophon gracilis Perry. 
Trophon multicostatus is called a synonym by some author- 
ities. 
2629 Bulla Gouldiana 
Better known as nebulosa, which see (No. 94). 
2630 SBythinella nuclea Lea. 
2631 Cadulus quadrifissus Cpr. 
Shell % inch long, the small end cut by a little cross composed 
of 4 slits. Dredged off San Pedro, Cal. (H. N. Lowe). 
2632 Cadulus Hepburni Dall. 
Shell polished, white, nearly straight, 11 mm. long. Vic- 
terlaiiB. C. 
2633 Cadulus Tolmiei Dall. 
Also from near Victoria, B. C., more curved than the last, 
rapidly tapering at the end. 
2634 Czcum magnum Stearns. 
2635 Cezecum Cooperi (See No. 211). 
2636—Callistochiton palmulatus Cpr. 
Valves small, high, arched, with raised sculpture, 11 ribs on 
anterior valve, 7 very strong ones on posterior one, bifurcated 
behind; color dark brown; length 11 mm. Monterey to Santa 
Barbara, Cal. , 
2637 #=Variety mirabilis Pilsbry. 
The last valve enormously thickened; interior bluish white. 
San Diego, Cal. 
2638 Calyptrza mamillaris 
Synonymy:—Galerus mammillaris Brod. 
Puget Sound to Ecuador. The ‘‘Chinese Hat shell;’’ shell 
white, of a low conical shape, running up to a point, while inside 
there is a twisted deck, thin and sharp, reaching nearly to margin; 
diam. 25 mm. or commonly less. Not common on the Californian 
coast. 
2639 Cardium biangulatum Sby. 
Santa Barbara Islands, Cal., to Panama. Shell heavy, 40 mm. 
high, with strong ribs, interior reddish. 
2640 Cardium Californiense comoxense 
Described by Dall from the boulder clay of Vancouver Island; 
ribs flattened, defined only by interstitial lines. 
2641 Cardium pseudofossile Reeve. 
