Dr. J. E. Gray on some Families of Bivalve Shells. 41 1 



B. Siphons separate, elongate, slender. 



8. 7>//fmW«,Syn.B.M.1842, 75;P. Z.S. 1847, 186. Pedal 

 opening elongate. Shell oblorg, cartilage internal or external. 



2. Cardinal teeth diverging, central laminar, folded; cartilage 



internal, in a triangular pit, 



9. MactradcB, Syn. B. M. 1842, 75; P. Z. S. 1847, 185; Ann. 

 and Mag. N. H. 1853, 38. 



10. Paphiada, P. Z. S. 1847, 186 ; Ann. and Mag. N. H. 

 1853, 38. Mesodesmidse, Syn. B, M. 1842, 75. Mantle lobes 

 united. Pedal opening small, anterior. Gills truncated behind. 

 Siphons short, separate, anal largest. 



11. ?Anatellidcs, Ann. and Mag. N. H. 1853, 38. Animal 

 unknown. 



3. Cardinal teeth very oblique, hinder nearly parallel with hinge- 



margin ; cartilage external, marginal ; umbones subspiral, 



12. Glossida, P. Z. S. 1847, 195. Isocardiadse, Syn. B. M. 

 1842, 80. Foot compressed, truncated, short, small; pedal 

 opening rather contracted ; lips simple ; shell free. 



13. Chamadce, Syn. B. M. 1842, 79; P. Z. S. 1847, 193. Foot 

 very small, rather produced in front; lips foliated; pedal opening 

 very small ; shell irregular, attached by the outer surface of one 

 valve. 



Fig. 1. 



Animal of Chama from Torres' Straits. 

 a, a, adductor muscles ; p, pedal muscle ; d, dental membrane ; ty labial 

 tentacle ; y, small outer gill ; e, anal siphon ; b, branchial siphon ; f, pedal 

 orifice ; m, pallial line ; o, portion of left mantle lobe occupied by ovarium ; 

 /, liver. — S. P. Woodward. 



4. Hinge tooothless ; cartilage internal, in a pit, with a shelly 

 appendage in front. 



14. Anatinidce, Syn. B. M. 1842, 77; P. Z. S. 1847, 190. 

 Siphons elongate, generally separate. Gills pinnate, apparently 



