178 



2617 Astrea inaequalis 



Synonymy: — Pachypoma inaequale 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 Bittium acieula Stimp. 



2623 Bittiuni arm i Hat u in ornatissimum Bartsch. 



2624 Bittium esuriens 



2625 Bittium fortior Cpr. 



2626 Bittiuni munitum munitoides Bartsch. 



2627 Bittium Oldroydii Bartsch. 



The above are some of the minute Californian shells, described 

 mainly in recent years. 



2628 Boreotrophon gracilis Perry. 



Trophon multicostatus is called a synonym by some author- 

 ities. 



2629 Bulla Gouldiana 



Better known as nebulosa, which see (No. 94). 



2630 Bythinella nuclea Lea. 



2631 Cadulus quadrifissus Cpr. 



Shell V2 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- 

 toria, B. C. 



2633 Cadulus Tolmiei Dall. 



Also from near Victoria, B. C, more curved than the last, 

 rapidly tapering at the end. 



2634 Caecum magnum Stearns. 



2635 Caecum 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 Calyptraea 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. 



