CONCHOLOGY, 
6. M.rugosus, Brit. Zool. pl. 66. fig. 1.— 
Donovan, pl. 141. 
7. M. precisus. Montague, pl. 4. fig. 2. 
8. M. gibsii. Turton’s Bivalves, p. 200. 
9. M. hirundo, Turton, t. 16. fig. 3. 4. 
PINNA. 
Shell triangular, gaping at the larger end, and 
fixed at the other by a beard of silky filaments ; 
hinge without teeth ; the valves conneeted on one 
side nearly the whole length. 
1, Pinna ingens, Donovan, pl. 150. Pinna 
levis. 
This vast shell is taken by the trawl, between 
Teignmouth and Torbay. 
2. P. fragilis. Turton, t. 20. fig. 4. 
3. P. pectinata. Turton, t. 19. fig. 1. 
4, P. papyracea. Turton, t. 20. fig. 3. 
The two last were discovered by Dr. Turton, 
C. With a single Valve. 
NAUTILUS. 
Shell consisting of compartments or cells, com- 
municating with each other by means of a small 
tube or perforation. 
1, Nautilus rotatus. Montague, pl. 15, fig. 4. 
N. calcar, 
2. N. umbilicatus, Montague, pl, 13. jig. 1. 
