2.% BIVALVK SHELLS. 



aubito truTirato : p])i(lciii)i(lc orassa, atro-fuscesccnte vel oli- 

 vai'Cii ; valvis intiis all)is, ad inarj;iiii-s interne i)ostioeque pur- 

 purco-violaceis ; cardine incrassato ; dentibus canbnalibus 

 ina-quidibus, mediano valvic dextra; majore, antico breviore, 

 postieo augustioie et lonfriore ; dentibus lateialibus angustis, 

 elongatis, superne transversim striatis, aliquantisper violaceo 

 tinctis. 



Cyreua Keraudrenia, Lesson, Voy. de la Coq. Moll. p. 429. pi. 11. 



f. 3(1829). 

 Cyrena phili])pinarum, Haiiley, Proc. Zool. Soc. 1844, p. 259 ; 



in JVoocL hid. Test. Suppl. 2. pi. 14. f. fiO. 

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



Hab. Insida "Waigiou dicta atque insulse Philippinenses ; flu- 

 viis insulic Niei)baiic<c. 



4. Batissa ixsignis. 



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

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

 latere antico late sulcata, sulcis remotis, ad lunulam saepius 

 inter se conjungentiljus ; umbonibus prominentibus erosis, 

 antice inclinatis ; cardine angusto, obliquo, inaiqualiter triden- 

 tato ; dentibus in valva sinistra angustioribus, nicdiano bifido, 

 in dextra crassioribus sirajjlicibus ; dentibus lateralibus angus- 

 tis, postieo valvse sinistra^ laminato apice regulariter serrulate. 



Batissa insignis. Desk. Proc Zool. Soc. 1854. 



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



5. Batissa triquetra. 



B. testa trigoua, obliqna, ina-quilaterali, cuneiformi, l?evigata, 

 epidermide nigro vestita, depressiuscula ; margiue antico I'ec- 

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

 umbonibus ])rofunde erosis ; lamina cardinali angusta, denti- 

 bus cardinalibus tribus insequalibus, brevibus, subcanalicu- 

 latis ; lateralibus elongatis, angustis, suba;qualibus, antico car- 

 dine aduato, postieo remoto ; valvis tenuibus intus albis. 



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



Hab. Insula; Philippinenses; Australia. Coll. Cuming. 



6. Batissa producta. 



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

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

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

 perne alba, postice inferneque violacea ; umbonibus magnis, 



