20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 60 



ing the suture, and behind it a smaller one. On some specimens, a 

 little larger than the type and believed belonging to the same species, 

 the spirals on the later whorls increase to four, the one behind the 

 suture becoming stronger; the front of last whorl has 14 spirals 

 below the anal fasciole. Outer lip sharp. Anal sinus deep. Inner 

 lip smooth, closely adhered to body wall above and loosely overlaps 

 the pillar below. Anterior canal short, arcuate, anterior end twisted 

 a little backward and dextrally. 



Dimensions: Type (U. S. Nat. Mus. Cat. No. 352633) measures: 

 Altitude 8.4 mm. ; greatest diameter 2.8 mm. 



The new species is similar to Drillia winchesterae Pilsbry from 

 Santo Domingo, but when compared with the figure it appears to 

 have a shorter anterior canal and lacks the spiral striae in the anal 

 fasciole and betAveen the spiral cords. The new species is also some- 

 what similar to Drillia senaria Woodring (Ms.) from the Bowden 

 marls, Jamaica. 



Occun^ence. — Middle or lower Miocene : In flood-wash, 1 mile south 

 of Brasso, Trinidad, British West Indies. 



DRILLIA PROPEFUSIFORMIS, new species 



Plate 2, figs. 3, 4 



Shell large, slender, solid, fusiform, strongly axially and spirall}^ 

 sculptured and consists of about one and one-half rather small, ap- 

 parently smooth, corroded nuclear and ten slightl}'^ inflated post- 

 nuclear whorls ; suture closely adherent, flexuous, and shallowly chan- 

 neled. Postnuclear whorls sculptured with four strong, broad, 

 rounded, vertical ribs, separated by broad valleys, undulating the 

 broad anal fasciole, strongest over the middle of the whorl ; on the 

 last whorl the ribs become obsolete at the base. Spirally sculptured 

 by a strong subsutural carina, closely marginating the anal fasciole 

 and also spirally sculptured between the anal fasciole and the follow- 

 ing suture on the earlier whorls by two and on the later Avhorls by 

 four strong, equal-sized, semirounded, broadly spaced cords overrun- 

 ning the axials and valleys; the postsutural spiral on the later whorls 

 marginates the suture and at times overlaps it. On the front of the 

 last whorl there are 16 primary spirals from the anal fasciole to the 

 end of the anterior canal. Besides these primary spirals, there arc 

 sharp, secondary spiral threads overrunning the wdiole surface of the 

 shell — about seven in the anal fasciole and about five between the pri- 

 mary spirals. Aperture moderately wide medially, slightly narrower 

 above and gradually narrowing below. Outer lip sharp, not lirate 

 within. Anal sulcus deep and moderately wide. Inner lip callus 

 closely adhered to body wall above and loosely overlapping pillar 

 below. Anterior canal short. Anterior extremity slightly recurved 

 and dextrallv twisted. 



