337 Dominican Fossils — Maury 173 



cal, in two series of nearly equal length; cardinal area small, near- 

 ly equilateral, with margins somewhat raised; grooves three; 

 beaks small, low, mesially impressed; shell ventricose, roundly 

 inflated; posterior margin evenly rounded, not truncate; anterior 

 and posterior margins meeting the hinge at an angle; inner mar- 

 gin of shell crenulate. Length 29, altitude 19, semidiameter 

 8.50 mm. 



Locality. — (Exp'd '16) Zone A, Rio Cana at Caimito. 



Scapharca cibaoica, n. sp. 

 Plate 30, Figure 19, 



Shell rude, very small, thin, inflated, oblong, base sinuous, 

 nearly parallel to the hinge, anterior and posterior ends rounded; 

 beaks higher, narrower and more pointed than usual in shells of 

 this general form; a broad, well-developed sinus extends from the 

 beaks to the base; beaks at the anterior third; ribs twenty-two, 

 about as wide as the interspaces; low, flat, square-cornered and 

 without ornamentation, one or two secondary ribs may arise in 

 the interspaces in the sinus; cardinal area long and narrow, with 

 elevated margin behind the beaks, short and wider in front; hinge 

 narrow; teeth fine, vertical except at both ends where they are 

 longer and slightly inclined; inner margin crenulate. Length of 

 largest shell 11, altitude 7, semidiameter 4 mm. 



This little shell is characterized by its rude sculpture, sub- 

 central sinus and narrow beaks. 



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

 Zone I, Rio Cana at Caimito. 



Scapharca patricia Sowerby 

 Plate 27, Figure 1 

 Area Patricia Sowerby, Quart. Jour. Geol. Soc. London, vol. 6, p. 52, 

 1849. 



Area patricia Moore, Quart. Jour. Geol. Soc, vol. 9, p. 129, 1853. 

 Area {Anadara) grandis Gabb, Trans. Amer. Phil. Soc. vol. 15, p. 



253. 1873. 

 Area patricia Guppy, Geol. Mag. London, p. 443, 1874; Quart. Jour. 



Geol. Soc, vol. 32, p. .531, 1876. 



