NO. 1312. SYNOPSIS OF THE VENERID^—DALL. 387 



MACROCALLISTA (CHIONELLA) PUELLA Carpenter, 1864. 



Gulf of California and south to Acapulco. 



Marvelously like J/, paniumi in color and form, but always a smaller 

 and thinner shell, with other distinctive characters. 



These two species have a great similarity to the Eocene type on 

 which the section CMonella was founded. 



AMIANTIS CALLOSA Conrad, 1837. 



San Pedro, California, to Cape St. Lucas, in shallow water. 



This elegantly sculptured, pure white species is well known. Dione 

 nohtJ/s Reeve, 1863, is based on a specimen somewhat more rounded 

 than usual. 



CALLOCARDIA ( AGRIOPOMA) CATHARIA Dall, 1902. 



Ballenas Bay, on the Pacific shore of Lower California, to the Gulf 

 of California and southward to the Ba}^ of Panama in 7 to 66 fathoms. 



White, somewhat chalky, sharply concentrically striated, with a sub- 

 cuneate outline and pap3a*aceous periostracum. The analogue of the 

 West Indian C. aresta Dall and Simpson, 1901. 



PITARIA NE\ArCOMBIANA Gabb, 1865. 



Monterey, California, to Clarion Island and the Gulf of California 

 in 15 to 31 fathoms. 



Thin and delicate, with zigzag brown markings and a papery perios- 

 tracum when fresh. 



PITARIA TOMEANA Dall. 1902. 



Bay of Panama (Galapagos Islands?)? inid Tome, Chile, in about 10 

 fathoms. 



The apparent analogue of P. faliiilnata Menke of the Atlantic 

 fauna, but without color painting on the specimens so far obtained. 



PITARIA CONSANGUINEA C. B. Adams, 1852. 



Panama. 



Belongs in the group with C. alh'da, etc., but has radial brown 

 markings and pinkish umbones. I have not seen it. 



PITARIA POLLICARIS Carpenter, 1864. 



Gulf of California, Cape St. Lucas, and south to Callao, Peru. 



A fine, large species, the young with brown painting, the adults 

 mostly polished white, it is Dione prora, varietv, of Reeve, 1863, 

 but not of Conrad; Ci/therea ohliquata Romer, in part, but not of 

 Hanley, 1844. The ivxx'^ prora comes from the Hawaiian Islands. 



