AUT. 22 MIOCENE GASTROPODS AND SCAPHOPODS — MANSFIELD 23 



Dimensions: Type (U. S. Xat. Mus. Cat. No. 352638) measures: 

 Altitude 6.6 mm. ; greatest diameter 2.2 mm. 



Occurrence. — Middle or loAver Miocene: In flood-wash, 1 mile 

 south of Brasso, Trinidad, British West Indies. 



The new species is similar to DriJlia orthopleura Pilsbry and 

 Johnson, from Santo Domingo, but the latter species has a larger 

 shell with a longer anterior canal. 



DRILLIA MANZANILLAENSIS, new species 



Plate 2, fi.i;-. G 



A single, poorly preserved specimen was collected at station 9197, 

 Manzanilla Coast, Trinidad. The shell is strongly axially sculp- 

 tured, consisting of (10 on the penultimate wdiorl) seminodulous 

 ribs. Suture is closely appressed and overlaps the preceding 

 wdiorl. Anal fasciole broad and deeply depressed, below which is 

 the prominent shoulder. Spiral sculpture of wide-spaced, fine, 

 raised threads overrunning the axials and interspaces and extending 

 over the base and canal. Canal rather long; extremity gone. 



Dimensions: Type (U. S. Xat. Mus. Cat. No. 352639) measures: 

 Length 13 mm. ; greatest diameter 5.5 mm. 



Horizon : Middle or lower ]Miocene. 



I am unable to find a very close relative to the described species. 



DRILLIA NIADDRINA. new species 



Plate 4, flgs. 6, 8 



Shell rather small, turrited, strongly axially sculptured and con- 

 sists of seven, inflated, rapidly enlarging whorls on the larger co- 

 type — tip broken away — and two and one-half nuclear and five post- 

 nuclear whorls on the smaller cotype. Suture appressed, distinct 

 and wavy. Nuclear whorls smooth, rounded; apical one minute 

 and glassy. Postnuclear whorls constricted at the suture and below 

 it and strongly shouldered in front of the anal fasciole. Axial 

 sculpture consists of 16 on the larger specimen and 14 on the smaller, 

 narrow, rather sharp, sigmoid ribs, extending from suture to suture 

 and separated by rounded bottomed interspaces. Spiral sculpture 

 consists of a low subsutural band and seven interradial striae belo^v' 

 this band, being separated by low, flat narrow bands. On the body 

 whorl, the ribs become obsolete at the base, overrun the axials, and 

 are separated by wider interspaces; forward they continue with 

 equal strength over the canal. In addition to the spirals and axials, 

 growth lines occur on the subsutural band and anal fasciole and 

 between the ribs over the base. The outer lip and lower part of the 

 canal are broken awav. 



