259 Dominican Fossils — Maury 95 



6 specimens and they all appeal to me as representing the genus 

 Strombina. To make this decision, however, more emphatic I 

 have had the group of shells photographed both natural size 

 and an enlargement of 4 diameters. * * *. These I think will 

 fully convince you that Gabb was correct in referring the species 

 to Strombina." 



But the Strombina referred by Gabb to haitensis is ribbed 

 only on the spire, never on the body (except when young) and 

 the shell is more ventricose and larger than the true haitensis. 

 I have called it pseudohaitensis. 



Our shell nearest haitensis is Strombina Bassi. This is of 

 the same ribbed type, but very much larger, measuring 11.50X 

 5, against 7x3.50 mm. 



Anachis exilis Gabb, with which 5. haitensis has been con- 

 fused, is a true Anachis and entirely distinct. 



Strombina pseudohaitensis, n. sp. 



Plate 15, Figures 12, 13 



Strombina Haitensis Gabb, Trans. Amer. Phil. Soc., vol. 15, p 221, 



Not Columbella Haitensis Sowerby, 1849. 

 Planaxsis crassilabrum Guppy, Geol. Mag. London, p. 411, pi. 18, fig. 

 13, 1874. (Young specimen). 



This differs from the true *S. haitensis in the absence of rib- 

 bing from the body whorl of adult shells. The ribs become ob- 

 solete on the sixth or seventh and are never present on the eighth 

 whorl. A large shell measures 9X5 mm. We have specimens 

 from Gabb and many hundreds of our own of all ages. 



Localities. — (Exp'd '16) — Bluffs 3, Cercado de Mao. (Ex- 

 tremely abundant). 



Strombina pseudohaitensis variety gurabe?isis , n. var. 

 Plate 15, Figure 14 



Shell oblong-ovate, slender, high-spired, whorls eight, the 

 first three smooth, nuclear; riblets on the fourth oblique, on the 

 fifth vertical, on the sixth obsolete, the seventh and eighth are 

 smooth except for spiral impressed lines at the anterior third of 



