BIVALVE SHELLS. 123 



PUl Ahhild. Conch. p. 17. pl. 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 obiiquis ; 

 lunula parva, cordiformi, profunde impressa, rarilamellosa ; 

 area elongato-lanceolata, marginibus angulatis circumscripta ; 

 valvis 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 

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

 subintegerrimo. 



Venus calcarea, Phil. Abhild. Conch. \. pl. 3. f. 1. 



Hah. Cuba. 



13. Chione? distans. 



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

 distantibus, lirisque radiantibus, postice nullis sculpta ; lunula 

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

 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. Lamellae inter se 

 distant; lamina cardinalis antice profunde intrat; dens cardi- 

 nalis secundus valvse dextrse, primus valvse sinistrse maximus, 

 <lens medianus valvse sinistrae bifidus {Philippi). 



b. Lamellce breviores, crassiores. 



4. Chione elegans. 



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



6* 



