27 



backwards and open at their extremity. Rather a 

 large lateral aperture. Several articulated ciliated 

 cirrhi ; testaceous valves very small, five, separate, 

 two semilunate at the sides of the aperture, one ex- 

 ceedingly minute dorsal and others equally minute 

 terminal. 



O. BLA.INVII.LII. Leach. Lam2.AnO. CUVIERI 

 Reeve, t. 16..? LEPAS CORNUTA. Lin. T. 11. t. 12. 

 /. 1. Turt. D. p. 73. Stalk longer than the body, 

 enlarging towards the base ; white regularly marked or 

 clouded with three purplish brown broken longitudinal 

 lines on each side, which partially extend down the stalk. 

 Length, 2. of tubular protuberances, f. On wood 

 from wrecks, Devon, Poole. 



CLASS CONCHIFEIU. 



Shell, with two valves, sometimes but rarely furnished 

 with differently shaped accessorial ones. 



ORDER DYMYARIA. 

 With at least two internal muscular scars. 



FAMILY TUBICOLARIA, LAM. 

 Enclosed in or attached to a shelly tube. 



GENUS TEREDO, LIN. 



Valves equal, largely open above and below, placed at 



the larger extremity of a tube open at both ends. 



B 2. 



