58* PROCEEDINGS OF THE NATIONAL MUSEUM vol.66 



Station 9219, Guaico-Tamana road, 2 chains east of mile 13. Station 

 8302, Caroni County, Montserrat Ward, 1 mile south of Brasso rail- 

 way station. Flood-wash (young). Station 9027, Caroni County, 

 Montserrat Ward, Brasso-Gran Couva Road, 100-200 yards west of 

 Brasso (young). ( ?), 9220, Nariva County, Charuma Ward, Macha- 

 poorie Quarry (casts). 



Genus AMAUROPSIS Morch 



AMAUROPSIS TRINITATENSIS, new species 



Plate 10, figs. 4, 6 



Shell large, subovate, with four remaining whorls, early whorls 

 decollate; spire high for genus with gradually enlarging whorls. 

 Whorls inflated with a low posterior shoulder; suture, as indicated, 

 narrow and shallowly depressed. 



Dimensions: Type (U. S. Nat. Mus. Cat. No. 352684) measures: 

 Altitude 45 mm. ; greatest diameter 33 mm. 



The new species resembles in outline specimens of an undescribed 

 form from station 6894, Crocus Bay, Anguilla, whose fauna has been 

 referred to the Oligocene. 



The high spire of the new species with its gradually enlarging and 

 low-shouldered whorls distinguishes it from A. gvppyi (Gabb). 



Occurrence. — Lower Miocene : Station 8299, Cumuto Road, 17 miles 

 from the Eastern Main Road, Trinidad. 



Genus CALLIOSTOMA Swainson 



CALLIOSTOMA ATTRINA. new species 



Plate 10, figs. 7, 8 



Shell rather small, conic, with seven remaining whorls — nucleus 

 missing ; whorls convex ; shoulder of body whorl narrowly rounded ; 

 sutural area depressed on later whorls. Spire whorls sculptured with 

 about six strongly beaded, primary spirals and two to three scattered 

 intermediate secondary beaded spirals or crenulated threads — a 

 smaller beaded spiral precedes the suture. About fourteen primary 

 spirals extend from the periphery of the body whorl across the base. 

 Margin of outer lip broken. Aperture apparently subovate. A small 

 chink lies behind the aperture. 



Dimensions: Type (U. S. Nat. Mus. Cat. No. 352688) measures: 

 Altitude 13 mm. ; greatest diameter 12 mm. 



Occurrence. — ^I^ower Miocene : Station 8299, Cumuto Road, 17 

 miles from the Eastern Main Road. Trinidad. 



