236 BIVALVE SHELLS. 



subito trimcato ; epidermide crassa, atro-fuscescente vel oli- 

 vacea ; valvis intus albis, ad margines inferne posticeque pur- 

 pureo-violaceis ; cardine incrassato ; dentibus cardinalibus 

 inaequalibus, mediano valvaj dextrae majore, antico breviore, 

 postico angustiore et longiore ; dentibus lateralibus angustis, 

 elongatis, superne transversim striatis, aliquantisper violaceo 

 tinctis. 



Cyrena Keraudrenia, Lesson, Voy. de la Coq. Moll. p. 429. pl. 11. 



f. 3 (1S29). 

 Cyrena philippinarum, Hanley, Proc. Zool. Soc. 1844, p. 259 ; 



in Wood, Ind. Test. Suppl. 2. pl. 14. f. 60. 

 Var. /3. Testa paulo depressiore, postice angulata. 



Hab. Insula Waigiou dicta atque insulse Philippinenses ; flu- 

 viis insulae Nicobaricse. 



4. Batissa insignis. 



B. testa ovato-orbiculari, oblique inaequilaterali, tumida, tenui, 

 intus violacea, epidermide nigro-virescente, nitido vestita, in 

 , latere antico late sulcata, sulcis remotis, ad lunulam saepius 

 inter se conjungentibus ; umbonibus prominentibus erosis, 

 antice inclinatis ; cardine angusto, obliquo, inaequaliter triden- 

 tato ; dentibus in valva sinistra angustioribus, mediano bifido, 

 in dextra crassioribus simplicibus ; dentibus lateralibus angus- 

 tis, postico valvaj sinistraj laminato apice regulariter sen"ulato. 



Batissa insignis, Desh. Proc. Zool. Soc. 1854. 



Hab. Calamang, insula Luzon Philippinarum. Coll. Cuming. 



5. Batissa triquetra. 



B. testa trigona, obliqua, iusequilaterali, cuneiformi, laevigata, 

 epidermide nigro vestita, depressiuscula ; margine antico rec- 

 tilineo, postico valde convexo, dilatato, inferiore vix arcuato ; 

 umbonibus profunde erosis ; lamina cardinali angusta, denti- 

 bus cardinalibus tribus inaequaUbus, brevibus, subcanalicu- 

 latis ; lateralibus elongatis, angustis, subffiqualibus, antico car- 

 dine adnato, postico remoto ; valvis tenuibus intus albis. 



Batissa triquetra, Desh. Proc. Zool. Soc. 1854. 



Hab. Insulae Philippinenses ; Australia. Coll. Cuming. 



6. Batissa producta. 



B. testa suborbiculari, valde obliqua, inajquilaterali, depressius- 

 cula, crassa, solida, transversim late et obsolete plicata vel sub- 

 undulata, epidermide poUta, atro-virescente vestita, intus su- 

 perne alba, postice inferneque violacea ; umbonibus magnis. 



