TEKEDO. 33 



varying in number in different specimens, and more crowded be- 

 low ; the slightly oblique lines uu the succeeding narrow area are 

 very minute but sharp ; the next lang-shaped 



, , .,, T , , "= , Fig. 359. 



area is ornamented witii distant, narrow, el- 

 evated, sub-imbricated, concentric lines, more 

 conspicuous on the anterior than on the pos- 

 terior half of the area ; the remaining portion 

 of the body and the auricle are smooth and 

 glossy. The auricle is not separated from the 

 body by any sharp angle on the posterior ventral 



,. IT ^' dilatata. 



outline, but by a gently waved sinus. A de- 

 l>ressed line runs from the beak aromid to the tip of the auricle, 

 which does not tower above the callosities of the hinge. The sub- 

 umbonal blade is thin, tapering, and extends to about half the dis- 

 tance from the beak to the ventral edge. The pallets are of an an- 

 gular ovate form, truncated posteriorly, where also, on the external 

 surface, there is a small depressed area. The style of insertion is 

 sharp, and extends in the form of a ridge for some distance on 

 both sides after the juncture with the pallet. The tubes are very 

 thin, strongly concamerated posteriorly in an imbricated manner. 



" This species differs from T. inegotara, Hanley, which it greatly 

 resembles, in the smaller altitude of the valves, the greater breadth 

 of the auricle, which is also placed much lower, and in its con- 

 camerated tubes." (^Stiiiipsuii.^ 



Length and breadth of adult specimens about half an inch. 



The original specimens were obtained from a pine buoy attached 

 to lobster pots near Cape Ann, by Mr. Tufts ; others from a similar 

 source at Provincetown. They are numerous in the shipping at 

 Marblehead. There can be no doubt that it is an indigenous species. 



The pallets are very small and the style is unusually short. The 

 other 'differences from T. megotara are so slight that I am not fully 

 satisfied that they are distinct. 



Teredo chlorotica.* 



Shell minute, sub-globose, greenish, the anterior area of the claw very large ; 

 pallets with tlie blades lyre-shaped, posterior portion encrusted. 



Shell quite small, solid, sub-globose, valves rhomboidal, greenish, 

 l)eaks enveloped in the callus of the triangular area, which is large, 



* Dr. Gould is to be quoted as authority for all the sjjecific names uewly jjroposed iu 

 this work. — W. G. B. 



