\2,<§ Dominican Fossils — Maury 165 



Localities. — (Exp'd '16) Bluffs 2 and 3, Cercado de Mao; 

 Zone I, Rio Cana at Caimito. 



Subgenus Barbatia Gray 



Barbatia cf. Bonaczyi Gabb 



Plate 30, Figure 15 



We have a number of valves of a small, thin Barbatia which 

 is either the unfigured B. Bonaczyi Gabb or new. Dall has 

 united Gabb's species with A. utnbonata, a true Axk; but the 

 main point of Gabb's indefinite description seems to be that this 

 species is nearest B. barbata, but has a more produced and 

 sloping posterior end. Ours is only half as large but may not be 

 adult. 



Cardinal area as in B. barbata; ends of the hinge more an- 

 gular; teeth with a short vacant gap between the short anterior 

 and long posterior series; beaks within the anterior fourth; 

 sculpture anterior to the umbonal ridge of fine, beaded, radial rib- 

 lets, anteriorly more widely spaced at intervals, giving the ribs a 

 grouped appearance as in B. barbata; umbonal ridge more marked 

 than in barbata; posterior ribs larger, dominating the concentric 

 sculpture which is prominent on the face; a group of fine ribs 

 lies next the hinge; shell produced and pointed along the um- 

 bonal ridge; posterior margin oblique. Length 18, altitude 10, 

 semi-diameter 3 mm. 



We have a larger valve from the Samba Hills which may 

 be a variation of this species, but it is thicker, the beaks are less 

 anterior, the cardinal area wider, and the teeth are shortest near 

 the middle, growing evenly longer distally, and there is no gap. 



Localities. — (Exp'd '16) Zone D, Rio Gurabo at Los Que- 

 mados; Samba Hills at approximately 540 feet altitude. 



Barbatia (Ca/toarca) submarylandica , n. sp. 



We found several fragments of a large Area of the A. Can- 

 dida group, but not that species because the characteristic large 



