TEREDO. 77 



8. T. MEGOTARA,* Hanley. 



Valves rather short, rapidly diminishing to a moderately atte- 

 nuated extremity ; auricles very large, rising dorsally above the 

 level of the beaks, and extending ventrally far below the base of 

 the triangular area, concave near the body, strongly reflected at 

 their extremities, not marginated internally, nor abruptly defined 

 externally. 



Pallets nearly resembling those of T. Norvagica. 



Tube simple, not concamerated posteriorly. 



Plate IV. fig. 6, and Plate XVIII. figs. 1, 2. 



Teredo nana, Turt. Dithyr. Brit. p. 16, pi. 2, f. 6, 7.— Flem. Brit. Anini. p. 455. 

 — Brit. Marine Conch, p. 29. — Brown, 111. Conch. G. B. p. 116, 

 pi. 50, f. 14, 15.— Gray, Philosoph. Magaz. (1827,) p. 410.— 

 Hanl. Recent Shells, p. 4, suppl. pi. H, f. 23, 24 (copied from 

 Turton). 

 „ navalis, Cuvier, Regno Animal, ed. gr., pi. 114, f. 2. 



It is with reluctance that we have changed the name of 

 this beautiful and comparatively large species, from the 

 prior, but very inappropriate name of T. nana^ bestowed 

 upon its young by the late Dr. Turton, whose specimens 

 were so small and imperfect, that nothing but actual com- 

 parison of them with a series commencing vtith perfect in- 

 dividuals of a similar size, could have proved their identity 

 with the magnificent examples from whence our drawings 

 and descriptions have been derived. So broken were they, 

 that their most characteristic feature, the ample auricles, 

 were denied to them in the body of his work-, (Conchylia 

 Dithyra, p. 16;) this statement is, however, corrected in 

 the Addenda. 



The entire surface of the valves is of an ivory-white, and 

 often highly polished. The triangular area, or anterior ex- 

 tremity, which is not severed from the body by any Im- 

 pressed line, is marked, as in the other Teredines, with 



* From f^'iya, greatly; aim^ot., eared. 



