BIVALVE SHELLS. 239 



Cyrena obesa Hinds, Ann.Nat.Hist.x.Sl ; Voy. ofSuIphur, p. 66. 

 pl.21.f. 6. 



Wood, Ind. Test. Suppl. 2. pl. 15. f. 3. 



Hab. Insulae Feejee dictse. 



13. Batissa corbiculoides. B.M. 



B. testa oblique triangulari, inaequilaterali, tumida, crassa, solida, 

 epidermide squalide viridi-fuscescente vestita, transversim in- 

 sequaliter sulcata et striata; umbonibus productis erosis, ob- 

 liquis ; lunula angido obtusissimo notata, magna, ovato-lan- 

 ceolata, lae^ngata ; area posticali rugis irregularibus obsoletis 

 divaricatis corrugata ; cardine lato, crasso, inaequaliter triden- 

 tato, dentibus compressis, divergentibus, simplicibus ; dentibus 

 lateralibus sicut in Corbiculis elongatis, angustis, tenue striatis, 

 antico paulo breviore ; valvis intus albis, in margine postico 

 violaceo maculatis. 



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



Hab. Nova Guinea (Jukes). 



14. Batissa humerosa. 



B. testa trigona, inffiquilaterali, cuneiformi, supeme gibbosa, 

 transversim inaequaliter striato-sulcata ; epidermide nigrescente 

 vestita, intus alba, in medio pallide purpmeo tincta ; latere 

 antico rectilineo, valde decli\a, inferne obtuse angulato, margine 

 dorsali leviter convexo, declivi, margine inferiore parum arcu- 

 ato, rugis aliquibus in latere postico divergentibus ; umbonibus 

 profunde erosis ; cardine lato, tridentato, dentibus inaequalibus 

 simplicibus, medianis majoribus ; dente laterali antico cardine 

 adnato, irregulariter corrugato, postico longiore, angustiore, 

 striis brevibus notato. 



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



Hab. Nova Guinea. Coll. Cuming. 



e. Species quarum patria ignota est. 



15. Batissa megadesma. 



B. testa ovato-transversa, magna, crassa, ponderosa, inaequilate- 

 rali, antice brevi, obtusa, rotundata, fusco-nigrescente, late et 

 irregulariter transversim uudulata, antice sulculosa ; latere 

 supero et postico sulco obsoleto decuiTcnte distincto ; liga- 

 mento maximo, elongato, cylindraceo, in medio carinato ; um- 

 bonibus erosis ; valvis intus candidissimis ; cardine crasso, in 

 utraque valva tridentato, dente posticali valvae sinistraj angusto. 



