28 



T. NAVALIS. Lin. 1267. Dil. p. 1089. Pew. 4. 

 p. 147. Mont. 527.- T. Biv. 14. t. 2.f. 1, 2,3. F. 

 p. 454. Z<m. I. Sow. G. Reeve, t. 21. Tube 

 more or less flexuous and tapering, semi- con camerated 

 near the smaller end ; pallets spoon-shaped, convex on 

 the outside and concave within, terminating at one end 

 in a linear elongation which is straight or a little flexu- 

 ous, and truncate at the other; valves ear-shaped 

 behind, one with a curved denticle on the margin above 

 the teeth. Diam. f . In timber. 



T. BIPENNATA. Turton, Die. 184. t. ll./ 38, 39, 

 40. T 7 . Biv. 15. F. 454. Gray. Phil. Mag. 1827. 

 Tube thicker and stronger, not at all concamerated ; 

 pallets very long and slender, somewhat curved and 

 feathered on each side ; valves ear-shaped behind, ob- 

 long, reflected on the outer margin and detached all 

 round the circumference on the under side, an oblique 

 rib on the margin above the teeth. Diam. f . Exmouth. 



T.MALLEOLUS. Turt. Biv. p. 255. t. 2.f.\9.F.p. 

 454. Tube consisting of a slight testaceous deposit on 

 the surface of the chamber, the termination of which is 

 slightly concamerated ; valves ear-shaped behind, auri- 

 cles reflected, pallets transverse and mallet-shaped; 

 strise on the triangular processes remote. Diam. {. 

 Torbay. 



