CONCHIFERA. 



257 



Wood perforated by Teredines, and occupied by their 

 shelly tubes, occurs in almost every locality of the London 

 clay. Those specimens in which the wood is petrified, 

 and the cavities of the tubes are filled with calcareous spar 

 of various colours, furnish beautiful sections, when cut and 

 polished."* 



Found in the European and Indian seas. Sir Everard 

 Home mentions a species called T. gigantea, which some- 

 times exceeds four feet in length and several inches in cir- 

 cumference. 



Cuphus. Guettard. (Furcella, Lam. ; Septaria, Lam. ; 

 Cloisonnaria, Fer.; Clausaria, Menke.) — The tube only 

 of this genus is known, it is calcareous, large, gradually 

 widening, at the smaller end divided into two tubes by a 

 partition; the valves and the animal have not been de- 

 scribed. — 1 species. 



Teeedina. Lam. — Shell equivalve, inequilateral, 

 bosses prominent, adhering to the outside of the rounded 

 end of a shelly tube; aperture of the tube with a division; 

 a flat additional piece is placed on the bosses. — Fossil. 



Family 8.— GA S TR 0 CHJENA CEA. 



The animal has the mantle completely closed up, as far 

 as a narrow frontal opening through which the small 

 pointed foot protrudes, which sometimes bears a byssus ; 

 behind, the mantle is lengthened into two siphons, joined 

 together in their entire length. The shell is equivalve, 

 without hinge, often without ligament, or spoon -shaped 



* Medals of Creation. 

 S 



