314 



In Mr. Cuming's collection there is a specimen of this shell which 

 has had its tube destroyed just above the valves. The animal has 

 formed a new tube of a small size and irregular form, flattened be- 

 neath, subcylindrical, but of a smaller diameter iu the middle, and 

 compressed at the end. 



Subfamily 2. Clavagellina. 



Only one valve of the adult animal imbedded in the shelly tubular 

 sheath, the others free and moveable in the cavity of the tube. 



Clavagella, Lamk. 



I. Some, like the Aspergillinae, appear to have lived sunk in sand, 



and are symmetrical in shape : these are only known in the 

 fossil state. 



1. Clavagella. 



The end of the siphon simple ; tube free, elongate, clavate, com- 

 pressed ; base with diverging tubes. Living sunk in sand or gravel. 



* Base convex, with scattered tubes. — Bacilia, Valenc. 



1. Clavagella echinata. B.M. 



C. echinata, Lamk., Desh. Coq, Paris, i. 9. t. 1. f. 788 ; ed. 2. t. 2. 

 f. 1-3. 



C. cristata, Lamk., Desh. Coq. Paris, ed. 2. t. 1. f. 16-20, junior ? 

 C. lagenalis, Desh. Coq. Paris, ed. 2. t. 2. f. 4-6. 

 Glycimeris margaritaceus, Lamk., shelly valve. 

 Hab. Fossil, Paris. 



** Base flat, with a fringe of branched tubes. — Clavagella. 



2. Clavagella coronata. B.M. 



C. coronata, Desh. Coq. Paris, i. 8. t. 3. f. 9, 10; ed. 2. t. 1. 

 f. 5-15. 



C. caillate, Desh. Coq. Paris, ed. 2. t. i. f. 1-4. 

 Hab. Fossil, Paris. 



II. Others now existing in the sea, inhabit holes in rocks or between 



barnacles and other fixed bodies ; the tube is irregular, and 

 modified inform by the cavity it inhabits and lines. 



2. Bryopa, Gray, 1840. 



The edge of the top of the siphon periodically expanded ; tube 

 shelly, base enclosed in a hole in the rock in which the animal re- 

 sides, siphonal end of the tube expanded, ruffled ; the inner sur- 

 face of the tube, round the valves, is pierced with small holes. 



1. Bryopa aperta. B.M. 



Clavagella aperta, Sow. Genera Shells, no. 13. f. 1-4. 

 Clavagella melitensis, Broderip, Proc. Zool. Soc. 1834, p. 116 ; 

 Trans. Zool. Soc. ii. p. 265, t. 35. f. 58. 



