235 Dominican Fossii^— Maury 6i 



Cythara cercadica, n. sp. 

 Plate 9, Figure 15 



Shell fusiform, with seven whorls, the first two nuclear; post- 

 nuclear whorls sculptured with narrow, sharp, nearly straight, 

 longitudinal ribs of which there are nine on each of the last two 

 whorls; interspaces wider, concave; entire surface marked by 

 weak, incised, microscopic spiral lines which cross both interspaces 

 and ribs, cutting the crests of the latter; outer lip broken 

 away; inner lip smooth. Length of shell 14.. so, greatest width 

 5.25 mm. 



This species is of the general type of Dr. Dall's C. ter- 

 mt7iula from the Pliocene of Florida. 



Gabb's C. heptagona is characterized by its seven promi- 

 nent ribs. 



Locality. — (Exp'd '16) Bluff 1, Cercado de Mao. 



Genus Glyphostoma Gabb 



Glyphostoma dentifera Gabb 



Plate 9, Figure 16 



Glyphostoma dentifera Gabb, Proc. Acad. Nat. Sci. Phila., vol. 24, p. 



270, pi. 11, fig. 4, 1872. 

 Glyphostoma dentifera Gabb. Trans. Amer. Phil. Soc, vol. 15, p. 210, 



1873. 

 The shell figured is a metatype of Gabb's. This species is 

 the genotype of Glyphostoma. 



Glyphostoma golfoyaquensis, n. sp. 

 Plate 9, Figure 17 



Shell very slender and graceful; whorls ten, the first three 

 nuclear, of these the first two are smooth and convex, the third 

 very sharply carinate; post-nuclear whorls seven, the first two 

 carinate, the remainder gently convex; suture linear; sub-sutural 

 channel marked with extremely fine spiral striae and coarse, con- 

 spicuous, raised arcuate growth-lines; whorls below the sub-su- 



