10 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.66 



whorl, two to three striae are behind the suture; and on the body 

 whorl, about seven striae occur on the anterior one-half the whorl. 

 Columella with three strong, sharp, twisted folds, the anterior one 

 being much stronger. 



Measurements of the larger specimen: Altitude 1.8 mm.; greatest 

 diameter 1.2 mm. 



The indeterminate form is related to Ringicula indentata Guppy. 



Occurrence. — There are two immature and corroded specimens 

 from station 9027. Brasso-Gran Couva Road, 100-200 yards west of 

 Brasso. 



Genus TEREBRA Adanson 



TEREBRA (STRIOTEREBRA) TRINITATENSIS. new species 



Plate 1, fig. S 



Shell small, moderately slender, surface glazed, with two and 

 one-half nuclear and seven postnuclear whorls; nuclear whorls 

 smooth, inflated, constricted at the suture; outline of postnuclear 

 whorls nearly flat on the earlier w^horls but gradually rounding out 

 on the later whorls. Suture shallowly grooved, constricting the later 

 whorls. Subsutural band narrow. Axial sculpture consists of about 

 16 prominent, narrow, cordlike, riblets, offset, keeled and retractive 

 over the subsutural band, arched centrally and protractive behind 

 the suture. Spire whorls without distinct spiral sculpture. Base 

 both axially and spirally sculptured — the spiral sculpture consists of 

 about twelve wide bands becoming nodulous at the intersection with 

 the riblets. Anterior canal long and twisted. Outer lip broken away ; 

 inner lip smooth. Siphonal fasciole provided with raised bands. 



Dimensions: Type (U. S. Nat. Mus. Cat. No. 352622) measures: 

 Altitude 9 mm.; maximum diameter 3 mm. Species based upon a 

 single specimen. 



Occurrence. — Middle or lower Miocene: In flood-wash, one mile 

 south of Brasso, Trinidad, British West Indies. 



TEREBRA (STRIOTEREBRA) BRASSOENSIS, new species 



Plate 1, fig. 5. 



Shell small, stout, tip broken off, only five wiiorls remaining; most 

 prominent feature of sculpture consists of two subsutural bands of 

 equal width, separated by a narrow sulcus, nodulus on the earlier 

 whorls and ridged on later where overrun by stronger axials, both 

 bands occupying more than one-half the area between the sutures. 

 Axial sculpture consists of moderately strong, narrow riblets contin- 

 uous with the nodules and extending from suture to suttu-e, retrac- 

 tive over the nodules and protractive forward, and also of finer rib- 



