CONCHOLOGY. 
MACTRA. 
Shell with the valves equal, mostly unequal at 
the sides ; middle tooth of the hinge complicated or 
triangular, with a small hollow each side ; the lateral 
teeth remote, locking into each other, 
Mactra stultorum. Brit, Zool, pl. 53. fig. 1. 
1, 
2. 
De 
4, 
3 
NS 
szeaez £ £S 5 B&B SB 
— Donovan, pl. 116, 
. dealbata, Montague, pl. 5. fig. 1. 
. solida. Brit. Zool, pi. 55. fig. 2.— 
Donovan, pl, 61. 
. subtruncata. Brit. Zool, pl. 55. fig. 1. 
— Montague, pl. 27. fig. 1. 
listeri, Donovan, pl, 64. fig. 1. Tellina 
plana. 
. boysii. Montague, pl. 3. fig. 7. Ligula. 
.lutraria. Brit. Zool. pl, 55. fig. 3.— 
Denovan, pl. 58. 
hians, Donovan, pl, 140.—Da Costa, 
pl. 17. fig. 4. 
crassa. Turton, t. 5. fig. 7. 
. triangularis, Turton, t. 6. fig. 14, 
. minutissima, Turton, t. 6. fig. 15. 
tenuis. Montague, t. 17. fig. 7. 
DONAX. 
Shell with the front margin very abrupt and 
blunt ; hinge with two teeth in the middle, and a 
single remote lateral one. 
