219 Dominican Fossils — Maury 55 



Drillia cf . magnoliana Olsson 



We have a single worn shell from Zone I, Rio Cana, near 

 Caimito, which is of the same general type as D. magnoliana 

 Olsson, from the Late Miocene of the Natural Well, Duplin 

 County, North Carolina. Unfortunately, our shell it too eroded 

 for an exact comparison. 



Drillia losquemadica, n. sp. 

 Plate 9, Figure 3 



Shell of moderate size, with nine whorls, the last sometimes 

 bearing a varix; first two volutions smooth, convex, nuclear; 

 subsequent volutions separated by a distinct linear, wavy suture, 

 beneath which is a raised spiral thread bordering the posterior 

 edge of the sub-sutural f asciole ; whorls sculptured below the f as- 

 ciole with straight, longitudinal ribs numbering fifteen on the 

 last whorl; the ribs do not cross the f asciole; spiral sculpture of 

 flattened threads (six on the penultimate and about twenty on 

 the ultimate whorl) crossing ribs and interspaces; posterior sinus 

 U-shaped, well-defined in adult shells; outer lip thin with about 

 half a dozen strong lirse far within. Length of largest shell 19, 

 greatest width 6.50 mm. 



Locality. — (Exp'd '16) Zone D, Rio Gurabo near Los 

 Quemados. 



Drillia Do?ialbertonis, n. sp. 

 Plate 9, Figure 4 



Shell rather small, solid, with two smooth, nuclear whorls; 

 post-nuclear volutions seven, boldly sculptured with strong, 

 rounded, straight, longitudinal ribs (fifteen on the last whorl) 

 cut short by the broad, conspicuous sub-sutural fasciole which 

 equals nearly one-half of the axial width of the whorls of the 

 spire; spiral sculpture of somewhat stronger threads alternating 

 with groups of finer lines; the spirals extend over the ribs, inter- 

 spaces and sub-sutural fasciole, the posterior edge of which is 

 bordered by a slightly stronger spiral; outer lip thin, with an external 



