ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 11 



lets between the stronger ones. Spiral sculpture consists of many 

 narrow bands separated by a narrower sulcus: base similarly sculp- 

 tured to spire, ornamentation extending to keel of siphonal fasciole. 

 Anterior canal twisted; outer lip partly broken away; inner lip cov- 

 ered with callus ; columella smooth with only a slight trace of biplica- 

 tion, the anterior fold well developed ; the anterior keel of siphonal 

 fasciole moderately developed. 



Dimensions: Type (U. S. Nat. Mus. Cat. No. 352623) measure^: 

 Altitude 6.2 mm. ; maximum diameter 2.4 mm. 



The sculpture of the new species resembles that of Terebra sulci- 

 fera Sowerly. The second subsutural band is w^eaker in Sowerby's 

 species, but the biplication on the columella is much more strongly 

 developed. 



Occurrence. — Middle or lower Miocene: Flood-wash, 1 mile south 

 of Brasso, Trinidad, British West Indies. 



TEREBRA, species indeterminable 



There are several fragments of the genus Terehra from station 

 9212 whose specific relationship can not be definitely determined. In 

 so far as can be observed, they are similar to forms occurring in the 

 Gurabo formation of the Dominican Republic, 



Genus CONUS Linnaeus 



CONUS SPRINGVALEENSIS, new species 



Plate 1, figs. 3, 6 



Shell rather small, moderately slender, eight whorled including a 

 small erect nucleus. Spire slightly concave in contour, altitude 5 

 mm. above the plane of the spire. Whorls excavated and in- 

 distinctly marked within by growth lines and bordered in front by 

 a sharp, weakly denticulated carina. Suture loosely appressed. Last 

 whorl gradually tapers to near the base where it is slightly incurved 

 dextrally and reflected. Spiral sculpture on the lower half consists 

 of about eleven flat bands, wide above and separated by striae, and 

 narrower below with interspaces equal in width to the bands. Outer 

 lip sharp. Aperture 2 mm. in greatest width, slightly wider below. 

 Columella slightly inflected and reflected. 



Dimensions: Type (U. S. Nat. Mus. Cat. No, 352644) measures: 

 Altitude 27 mm. ; alt. of spire 5 mm. 



In a general way, the new species resembles C, chipolanus Dall 

 from the Chipola marl member of the Alum Bluff formation of 

 Florida, but differs from this species in possessing a more excavated 

 and carinated spire whorl and a less tapering body whorl. 



