i5° Bulletin 29 314 



Our shells resemble Guppy's figure of the Bowden species and 

 appear identical. 



Locality.— (Exp'd '16) Bluff 3, Cercado de Mao; Zone H, 

 Rio Cana at Caimito. 



Turbonilla {Pyrgiscus) riomao'ensis, n. sp. 



Plate 25, Figure 18 



Shell extremely slender with thirteen or fourteen whorls ex- 

 clusive of the protoconch which is lost, whorls flattened or slight- 

 ly convex; suture deep, sub-canaliculate; whorls adorned with 

 straight, rather heavy ribs of w T hich there are 16 on the last 

 whorl ending at the periphery; between the sutures in the inter- 

 stices between the ribs there are eleven incised spiral lines which 

 define regular, even, spiral bands; aperture oval; base of body- 

 whorl gently rounded, columella with a low, broad fold. Length 

 6.5, diameter .90 mm. Distinguished by its slender form, deep 

 sutures and rather heavy ribs. 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao. 



Turbonilla ( Visma) turritelloioles Gabb 



Plate 25, Figure 19 



Turbonilla turritelloides Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 

 226, 1873. 



Our shells answer well to Gabb's description of this unfigured 

 species which resembles a miniature Twritelta. It is a Visma. 



Locality. — (Exp'd '16) — Bluff 3, Cercado de Mao (Abund- 

 ant). 



Turbonilla (Mormula) NanniebellcB, n. sp. 



Plate 25 J Figure 20 



Shell with twelve to fourteen convex whorls adorned with 

 strong ribs and strong, raised spiral lines in the intervals between 

 the ribs; protoconch small, bulimoid, the last half im- 

 mersed, the apical half projecting laterally and lying at right 



