BIVALVE SHELLS. 123 



Phil. Abbild. Conch, p. 17. pi. 5. f. 2. 



Venus Berryi, var., Sow. jun. Thes. Conch, p. 724. 



Hab. Nova HoUandia occidentalis (Menke). 



11. Chione retroversa, Desh. B.M. 



C. testa trigono-subrotundata, crassa, depressa, obliqua, inaequi- 

 laterali, pallide rosea, ad apices purpurea; lamellis basi crassis, 

 ad marginem acutis, latis superne reflexis retroversis ad latus 

 posticum erectiusculis, tenuioribus; umbonibus acutis obliquis ; 

 limula parva, cordiforrai, profunde impressa, rarilamellosa ; 

 area elongato-lanceolata, margiuibus angulatis circumscripta ; 

 vaMs intus vivide purpuratis ; sinu pallii parvo, triangulari, 

 angusto, horizontali. 



Hab. A-Ustralia. 



12. Chione calcarea. 



C. testa ovato-orbiculari, alba, opaca, veluti calcarea ; cingulis 

 transversis lamellosis, parura elevatis, distantibus, demum eva- 

 nescentibus sculpta ; area lanceolata, planata, laevi ; lunula 

 cordata, linea profunda, cincta, compressa, striata; margine 

 subintegerrimo. 



Venus calcarea, Phil. Abbild. Conch, i, pi. 3. f. 1. 



Hab. Cuba. 



13. Chione? distans. 



C. testa ovata, alba, opaca, lamellis transversis raris valde 

 distantibus, lirisque radiantibus, postice nuUis sculpta ; lunula 

 cordiformi, lamelloso-striata, plana ; area nulla ; ligameuto 

 subimmerso ; cardine utrinque tridentato, dentibus anteriori- 

 bus magnis, productis ; pagina interna alba, lamina cardinali 

 et utroque latere rufis ; margine crenulato. 



Venus distans, Phil. Zeits.fur Malak. 1851, p. 126. 



Hab. Panama. 



Margo ventralis semicircularis, dorsalis posticus rectilineus, 

 parum declivis, extremitas postica angulata. Laraellse inter se 

 distant ; lamina cardinalis antice profunde intrat ; dens cardi- 

 nalis secundus valvae dextrae, primus valvse sinistrae maximus, 

 (lens medianus valvse sinistra; bifidus {Philippi). 



b. Lamella breviores, crassiores. 



4. Chione elegans. 



C. testa oblongo-ovata, calcareo-alba, lamellis concentricis sub- 



6* 



