114 CONCHIFERA. DIMYAIRA. 



front. 1 foot long and f of an inch in diameter. Inhabits sub- 

 merged timber or ships' bottoms. B. Brown's Illust. pi. 3. 



Gen. 56. TEREDINA, Lam. 



Tube testaceous, tubular, cylindrical, with the posterior extre- 

 mity closed, but showing the two valves of the shell ; anterior 

 extremity open. 



This genus was instituted for the reception of two fossil species found at Courtan- 

 gon in Champagne, and Plaisance in Italy. 



Gen. 57. SEPTAEIA, Lam. 



Tube testaceous, very long, gradually attenuated anteriorly, 

 and as if divided interiorly by vaulted incomplete partitions ; 

 anterior extremity of the tube terminated by two other slen- 

 der tubes, not divided. 



S. arenaria, Lam. (Serpula polythalamia, Lin. Solen Arenarius, 

 Humph.) Inhabits sand on the shores of the Indian seas Rumph. 

 Mus. pi. 41, fig. D, E. 



Gen. 58. FISTULANA, Lam. Teredo, Gmel. 

 Sheath tubular, generally testaceous, tumid and closed posteri- 

 orly, attenuated at the anterior extremity, open at the sum- 

 mit, and containing a free bivalve shell ; valves of the shell 

 equal and gaping when shut ; animal with two tubular ap- 

 pendages in front. 



The animals of this genus live in sand, wood, stones, and even burrow in thick 

 shells. 



F. clava, Lam. Sheath tapering, club-shaped, straight, the valves 

 of the shell elongated, slightly arched. 2 inches long, and half 

 as broad at the lower extremity. Inhabits Indian seas Favanne, 

 pi. 5, fig. K. 

 Fossil species of this genus have been found in France and Italy, and in England 



in the fossil wood of the London clay. 



Gen. 59- CLAVAGELLA, Lam. 



Sheath tubular, testaceous, attenuated and open anteriorly, ter- 

 minating behind in an oval subcornpressed club, rough with 

 spiniform tubes ; club displaying on one side a valve of the 

 shell attached to its walls, the other valve free in the sheath. 



The remains of this genus are all fossil. They have been found in France and 

 Italy, and in England in the London clay. 



Gen. 60. ASPERGILLUM, Lam. 



Sheath tubular, testaceous, narrowed towards the anterior part, 

 where it is open, and thickened posteriorly into a club, with 

 the two valves of the shell incrusted on its walls ; terminal 

 disc of the club convex, pierced with scattered subtubular 

 holes, with a fissure in the centre. 



A. Javanum, Lam. (Serpula penis, Lin.) Sheath smooth; disc 

 behind surrounded with fimbriated rays. Inhabits Indian Ocean. 

 Lam. v. 429. 



