30 BULLETIN 122, UNITED STATES NATIONAL MUSEUM. 



having the dental ridges of the anterior portion much heavier and 

 fewer in number, and by having the middle median portion much 

 more smooth. The blade of the pallet, too, is heart shaped, while in 

 the Florida form it is more paddle shaped. 



Subgenus Neoteredo Bartsch. 



1920. Neoteredo Bartsch, Proc. Biol. Soc. Washington, vol. 33, p. 69. 



The characters which differentiate this subgenus from typical 

 Teredo are that the pallets are spoon-shaped instead of paddle- 

 shaped, but cupped at the distal end. The small posterior auricle 

 bends inward very strongly and thus forms a deep cavity which ex- 

 tends from the umbones downward behind the shelf thus produced. 



Type. — Teredo {Neoteredo) reynei Bartsch. 



KET TO THE AMERICAN SPECIES OF NEOTEREDO. 



Pallets of miraflora unknown. 

 Shell : 



Auricle very small reynei. 



Auricle moderately large miraflora. 



TEREDO (NEOTEREDO) REYNEI Bartsch. 

 REYNE SHIPWORM. 



Plate 23 ; plate 33, fig. 3. 



1920. Teredo {Neoteredo) reynei Bartsch, Proc. Biol. Soc. Washington, 

 vol. 33, pp. 69, 70. 



Shell subglobular; exterior cream-yellow excepting the central 

 portion of the median part, which is dark brown gradually shading 

 to light brown posteriorly; interior bluish white. The anterior 

 portion consists of an outer roughly grooved area at the "extreme an- 

 terior edge, followed by the main anterior portion which bears den- 

 tal ridges and is, about two and a half times as broad as the part 

 just mentioned. The dental ridges are of quite regular width and 

 spacing ; they curve downward at their anterior limit, then extend in 

 an even curve across the shell to meet the anterior end of the dental 

 ridges of the median portion. In the type 125 of these dental ridges 

 are present. These ridges are about as wide as the grooves that 

 separate them. They are triangular with the dorsal slope a little 

 more abrupt than the ventral, the edge being finel}' serrated. The 

 depressions between the denticles pass down on both sides of the 

 dental ridge as fine incised lines. There are about six denticles 

 present on the ridge in a distance equal to that separating ridge 

 from ridge. The dental ridges of the anterior and median part 

 meet almost at right angles. The denticles on the median part are 

 slightly stronger than those on the anterior ridges. The dental 

 ridges of the median portion terminate rather abruptly without 



