IOO 



Bulletin 29 264 



does not attain a length exceeding 5 mm. 



This Anachis also occurs at Bowden. 



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

 tremely abundant.) 



Subgenus Astyris H. and A. Adams 



Astyris Debooyi, n. sp. 

 Plate 21, Figure 6 



Shell with six whorls, the first two glassy, nuclear; the four 

 following porcellanous, entirely smooth except for six revolving, 

 impressed lines at the anterior part of the last whorl; collumella 

 with a thin callus through which the six striae encifcling the 

 base of the shell are visible; outer lip with six minute, micro- 

 scopic denticles, of which the two posterior are much the 

 stronger. Length of shell 5, of aperture 2, greatest width 2 mm. 



This species has an extra whorl and slenderer form than 

 Say's A. htnata. It is very close to acanthodes Dall, from the 

 Tampa silex beds, Florida. 



This is the first true Astyris reported from the Santo Do- 

 mingo Tertiaries. It is dedicated to Mr. Theodoor de Booy, of 

 New York City, who is carrying on extensive researches in the 

 archaeology of Santo Domingo. 



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

 rare. ) 



Genus StroMBiNELLA Dall 



Strombinella acuformis Dall 

 Plate 21, Figure 7 

 Strombinella acuformis Dall, Proc. U. S. National Museum, vol. 19, 

 no. 1110, p. 312, pi. 29, fig. 6, 1896. 



There are but three specimens known of this rare and grace • 

 ful shell. We possess one that Gabb collected, and the other 

 two are in the National Museum. The type locality is Potrero, 

 Rio Amina. 



Genus Typhis Montfort 

 Typhis alatus Sowerby 

 Typhis alatus Sowerby, Quart . Jour. Geol. Soc. London, vol. 6, p. 48, 



