84 PHOLADIDiE. 



from drifted wood in the British Channel. Mr. Bean, of 

 Scarborough, has taken it alive from a plank of oak. 



5. T. MALLEOLUS, Turtou. 



Valves similar to those of hipennata. 



Pallets testaceous, consisting of a mallet-shaped plate, or a more 

 or less expanded, thin, incurved lamina surmounting, at an obtuse 

 angle, ,a short and filiform stalk. 



Plate I. Figs, 12, 13, 14. 

 Teredo malleolus, Turton, Dithy. Brit. p. 255, pi. 2, f. 19. — Brown, Illus. 

 Conch. G. Brit. p. 116, pi. 50, f. 16.— Flem. Brit. Anim. ]>. 

 454.— Brit. Mar. Conch, p. 28.— Gray, Philosoph. Magaz. 

 1827, p. 410.- PIanlev, Des. and 111. Cat. Recent Sh. p. 4, 

 suppl. pi. 11, f. 25 (copied from Turton). 



The valves of this very rare Teredo, are so precisely 

 similar to those of hipennata^ that it has been conjectured 

 that Turton fabricated this species from the young anterior 

 appendages of that shell, and some distorted tail plates of 

 Norvagica. An examination of the interesting collection of 

 Mrs. Griffith of Torquay, disproves this erroneous impression, 

 as that lady possesses several specimens with the valves 

 and pallets united by the shrivelled animals. The few in- 

 dividuals we have been enabled to inspect, and which pos- 

 sibly may not be adult, although several exhibited all the 

 indications of maturity, only appear to differ from hipennata 

 in respect to their valves, by being invariably much smaller, 

 with their auricle less developed, and running in a concave 

 line above, almost on a level with the apices of the beaks ; 

 internally, too, it does not seem plicated or scarcely so, and 

 IS much excavated and but little reflected outwards. The 

 external surface is smooth posteriorly, and the subumbonal 

 tooth-like apophysis, is typically most strongly clavate at its 

 termination. The pallet, which is white and of a testaceous 

 substance, frequently, but not necessarily, bears a consider- 



