12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 66 



OccmTence. — Upper Miocene: Springvale, near Couva, Trinidad, 

 British West Indies. 



CONUS TRINITATENSIS, new species 



Plate 1, figs. 1, 4 



Shell small, moderately stout, diameter about one-half length of 

 shell, eight and one-half whorled. Last two whorls of spire nearly 

 flat, the rest rising rather steeply to an altitude 4 mm. above the 

 plane of the spire. Nucleus small, smooth, with one and one-half 

 whorls. First two postnuclear whorls carinated and turrited. 

 Suture of the earlier whorls shallowly channeled and somewhat 

 appressed, on later whorls less appressed and deeper channeled. 

 Last three whorls moderately medially concave. Sculpture of 

 spire consists of a strong, flat, raised spiral band in front of the 

 suture closely followed by three small, rounded, equally spaced spiral 

 threads occupying two-thirds of the remaining space. Concave arc- 

 uate growth lines overrun spirals and extend from suture to suture. 

 Last whorl with low carina at the shoulder and sculptured mainly 

 on the lower two-thirds with narrow bands with wider interspaces 

 occasionally carrying an intermediate thread. Outer lip broken 

 away. Aperture moderately narrow. Columella nearly straight, 

 slightly incurved and dorsally reflected. 



Dimensions: Type (U. S. Nat. Mus. Cat, No. 352645) measures: 

 Altitude 20 mm. ; maximum diameter 10 mm. ; altitude of spire, 4 mm. 



The most prominent character of the new species is the strong 

 spiral band in front of the suture of the spire. It is somewhat sim- 

 ilar to C. suhmonilifera Gardner (Ms.), a species occurring in the 

 Shoal River marl member of the Alum Bluff formation of Florida, 

 but possesses a proportionally lower spire and different arrange- 

 ment of spirals. 



Occurrence. — Middle or lower Miocene: Guaico-Tamana Road, 

 2 chains east of mile 13 from junction with Eastern Main Road, 

 Trinidad, British West Indies. 



CONUS MANZANILLAENSIS, new species 



I'hxte 2, figs. .5, 10 



Shell of medium size, broadly conic, last three postnuclear whorls 

 flat, remainder rising rather steepl}' to an elevation 5 mm. above 

 the plane of the spire, with eight postnuclear and one and one- 

 half nuclear whorls. Nuclear Avhorls slightly corroded but appar- 

 ently smooth. I^irst four postnuclear whorls spirally coronate and 

 carnate behind the channeled suture, remaining whorls sculptured 

 with faint concave growth lines and faint concentric lines lying 

 within the shallowly excavated anal fasciole. Last whorl slightly 

 rounded below the carinated shoulder; below gradually sloping to 



