JUKES-BROWNE : ON SOME GENERA. OF VENEEID-^. 245 



Kateltsia, Romer, 1857. 



Subgenus. Type, Vemis scalarina, Lam. 



Shell obliquely oval, rather compressed, anterior side short; sculpture 

 consisting of strong concentric ridges or riblets, which are sometimes 

 corrugated by radial striae. Pallial sinus very small. Hinge-plate 

 short, triangular ; teeth nearly straight, upper surfaces of all more or 

 less rugose, median in each valve stout and bifid. 



Species. — K. scalarina. Lam.; K. strigosa. Lam. (=^. corrugata, 

 Lam., 'i non Gmel.); K. Peronii, liam. {?= aphrodina, Lam.); S'. 

 regularis, Desh. 



Hemitapes, Romer, 1864. 



Subgenus. Type, F. rimularis, Lam. 



Shell oval or subtrigonal, tumid, with irregular concentric sculpture, 

 or flat ribs and grooves. Escutcheon defined by absence of sculpture, 

 and sometimes by a slight keel. Pallial sinus fairly deep. Hinge- 

 plate small ; teeth all short ; in right valve the posterior is narrow, 

 curved, and grooved ; the median narrow, tall, and grooved ; in the left 

 valve the anterior is narrow, but the median is thick and bifid. 



Species. — H. rimularis., Lam.; H. flammiculata, Jja.va.. [= hiantina. 

 Lam.); H. tristis. Lam.; H. striata, Chem. [= vermicidosa, Lam., 

 aurisiaca, Gray, and Lahiana, A. Ad. & Eeeve) ; H. Philippi, Desh. ; 

 S. cor, Sow.; H. variahilis, Phil. {= marmorata, Lam.?, laterisulca. 

 Lam., orientalis, Desh., ustulata, Desh., and recens, Sow. non Chem.) ; 

 H. flammea, Gmel. {= radiata, Chem. and Desh.); H. recens, Chem. 

 (and of Wood and Hanley, but not of Sow.). 



Genus SAMAPtANGIA, Dall, 1902. 



Generic characters. — Shell oval or subquadrate, inequilateral, with 

 prominent curved umbones, solid, white with a dull surface, con- 

 centrically striate or lamellose. Lunule circumscribed, escutcheon not 

 defined; ligament long and thick. Margins smooth. Pallial sinus 

 moderate, angular. Hinge-plate deep and strong, with a flat or 

 concave space in front of the anterior tooth in each valve. Teeth, 

 3-3, divergent, and unequal in size, only the right postei'ior and 

 sometimes the left median being grooved. Pedal scar merging more 

 or less into that of the adductor. 



Samarangia, s.s. 



Type, V. quadrangularis, A. Ad. & Reeve. 



Shell large, thick, subquadrate, rounded. Lunule flat, impressed, 

 and clearly circumscribed. Nymphs deep, that of right valve some- 

 times having a ridge or riblet at the base. In right valve the posterior 

 cardinal is strong and bifid, the median long, narrow, entire, and not 

 reaching to top of hinge-plate, the anterior short and small. In the 

 left valve the anterior and median are united at the top so as to fit 

 over the right median. Pallial sinus fairly deep, horizontal. 



Species. — S. quadrangtdaris, A. Ad. & Reeve ; S. exalbida, Chem. ; 

 S. lenticularis, Sow. ; ? S. Kennerleyi, Reeve ; ? S. rufa, Lam. 

 {=V. opaca, Sow.). 



