399 Dominican Fossils — Maury 235 



rib, dividing the shell into a slightly shorter anterior and longer 

 posterior portion ; the surface anterior to the groove is sculptured 

 with extremely fine, sharp, concentric threads prettily crenulated 

 by their intersection with fine radial impressed lines ; on ap- 

 proaching the groove the radials abruptly end ; the posterior por- 

 tion of the valve is ornamented onlv with concentric lines set at 

 an angle to the anterior lines and about twice as far apart. 

 Length 8, altitude 5, semidiameter 3 mm. 



Locality. — Exp'd '16) Bluff 3, Cercado de Mao. (Rare). 



Genus Teredo Linne 

 Teredo incrassata Gabb 



Plate 39, Figure 24 



Knphus iucrassatus Gabb, Trans. Amer. .Phil. Soc, vol. 15, p. 246, 



I §73 ! Jour. Acad. Nat. Sci. Phila., vol. 8, new. ser. p. 342, pi. 44, 



fig. 12 a-e. 

 Teredo fistula ? Guppy, Quart. Jour. Geol. Soc. London, vol. 32, p. 



529, 1876. 

 Teredo incrassata Dall, Trans. Wagner Inst. Sci., vol. 3, pt, 6, p. 



1587, 1903- 



These tubes were first seen loose on the road from Los Que- 

 mados to Caimito. They were several feet long and at first 

 glance appeared to be exposed roots of trees. They are frequent- 

 ly incrusted with a hydrocoralline. Gabb found them east of 

 Guayubin and in the Sambas. 



Localities. —(Exp'd '16) Teredo limestone, above the 

 Area patricia beds, Rio Cana at Caimito (scattered through the 

 soft yellowish limestone) ; Bluff 3, Cercado de Mao (compara- 

 tively rare); Samba Hills, approximate altitude 540 feet. 



Printed April 27, 1917 



