NO. 1312. SYNOPSIS OF THE VENEIiW.E—D ALL. 399 



shape. They are usually chalky and of a <^ray tint. A variety txinida 

 (but not Tajh'x faiiiida Sowerhy, 1853) has been proposed b\" Carpen- 

 ter, hut it does not dift'er from (yrbdhi sufficiently to name, though it 

 was i-enamed Chlone conradl by Homer in 1867. 



PAPHIA STAMINEA var. SULCULOSA Dall, 1902. 



San lo-naoio lagoon, west shore of Lower California. 



This ditlers from the ordinary forms of the species in having the 

 concentric sculpture obsolete, the ribs fewer and stronger, and behind 

 the middle of the shell separated b}- equal or even wider unsculptuied 

 channels or interspaces. The color is pure white, and the only speci- 

 mens of this varietv I have seen were collected hy Henrj- Hemphill. 



PAPHIA (PROTOTHACA) THACA Molina, 1782. 



Ba}' of Panama to Valparaiso, Chile. 



When well developed this form is very striking on account of the 

 discrepant sculpture on the ditierent parts of the disk, a feature which 

 exists, more or less distinctly, in all the species of this group. The 

 young are sometimes prettily painted with purple brown. It is a 

 notable species for economic purposes in Chile, where it is largely 

 used f()r food, and called taca. It was first described by Molina as 

 ChaiiKi tJutca and referred to Verms by Gmelin. It is the Y. domheli 

 Lamarck, 1818; T^ chllensts Sowerby, 1835; Y. ignohtlls Philippi, 1844; 

 but not Veivus <y)himh{e7isis Sowerby, as stated l)y Deshayes in 1853. 



PAPHIA (CALLITHACA) TENERRIMA Carpenter 1856. 



Victoria. British Columbia, and south to San Quentin Bay, Lower 

 California. 



This magniticent shell is markedh' distinct in its characters from, 

 and much larger than an}^ of the other west coast species of the genus. 

 It seems to be rather rare. When Dr. Gould described his Yeini-^ 

 rigida (not Vermes rigida Dillw3'n, 1817) he included representatives 

 of two species. One of these was Paphia staminea Conrad, and the 

 other the present species, which w'as discriminated by Dr. Carpenter, 



LIOCYMA BECKII Dall, 1870. 



Plover Bay, Eastern Siberia, near Bering Strait, and southward to 

 Unalaska, eastward to Kadiak and Prince William Sound, in ♦> to 00 

 fathoms. Also North Japan. 



Shell subtrigoiial, inflated, with yellow or greenish yeriostracuni, and 

 irregular concentric sulci. Leng-th of largest individual, 18.0: diame- 

 ter, 8.5 nmi. 



LIOCYMA VIRIDIS Dall, 1871. 



Point Barrow, Arctic Ocean, south through Bering Strait and Sea 

 to the Okhotsk Sea, the Aleutian Islands, and eastward to Kadiak 

 Island, Alaska, in 4 to 70 fathoms. Also North Japan. 



