2i 6 Bulletin 29 380 



Pitaria acuticostata Gabb 

 Plate 37, Figure 2 

 Callista acuticostata Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 250 



1873- 

 We collected a large number of shells, mostly young, which 

 answer to Gabb's description of this unfigured species. They 

 resemble young shells of P. circinata, but are flatter and the 

 lamella are all equal, there being no intermediate thread. Length 

 of largest shell 11, altitude 17, semidiameter 6*mm. 



Localities. — (Exp'd'i6) Zone G, Rio Gurabo at Los Que- 

 mados. 



Pitaria carbasea Guppy 

 Cytherea {Circe) carbasea Guppy, Quart. Jour. Geol. Soc. London, vol. 



22, p. 292, fig. 13, 1866. 

 Callista Carbasea Gabb, Trans. Amer. Phil. Soc., vol. 15, p. 250, 



1873- 

 Piteria {Hyphantosoma) carbasea Dall, Trans. Wagner Inst. Sci., vol. 



3, pt. 6, p. 1266, 1903. 

 This species was described from a Jamaican fossil and later 

 found by Gabb in Santo Domingo. We have no representatives 

 of this shell and it is here simply mentioned as an authentic fig- 

 ured, species likely to be found in Dominican collections. 



Pitaria cercadica, n. sp, 

 Plate 37, Figure 10 



Shell, rounded, inflated, umbones full, beaks incurved ; 

 lunule marked off by a single line hardly breaking the concentric 

 sculpture ; escutcheon not defined ; umbonal region of both our 

 shells smooth, perhaps worn so, entire remaining surface sculp- 

 tured with close, fine, apparently uniform flattened ridges, but 

 when examined with a lens they are seen to be somewhat irregu- 

 lar and occasionally divaricating ; only one imperfect hinge is 

 free from the matrix but it appears to be that of Pitaria. Our 

 shell shows no radial sculpture whatever. Length 30, approxi- 

 mate altitude 25, semidiameter 10 mm. 



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



