133 Miocene Fossils, Olsson 13 



ture, more nearly parallel to the spirals elsewhere ; a wide, 

 shallow sulcus encircles the base of the body- whorl ; outer lip 

 not heavy, with 6 long, internal lirations ; columella smooth, 

 below with a heavy callus, somewhat toothed on the border of 

 the anterior canal. 



Length 22, breadth 13 mm. 

 The coarse spirals and few riblets are the main distinguish- 

 ing characters of this species. 



Yorktown formation ; Chocowinity \ N. C. 



Nassa aiumensis, n. sp., Plate 2, Fig. 5 



Shell small, globose, solid ; nucleus of 3 smooth whorls ; 

 post-nuclear whorls 3, with few ribs and unequal spirals ; the 

 body-whorl with 10 ribs which are most prominent on the mid- 

 dle, obsolete or absent on the base ; the ribs are narrow with 

 wide interspaces ; spirals consisting of raised, unequal bands, 

 numbering on the body-whorl about 18 ; on the penultimate 

 whorl, there are 6 spirals, the 1st 2 bordering the suture are 

 low, the next 5 are stronger, the 4th on the periphery, much the 

 the heaviest ; on the base, the spirals closely spaced and even ; 

 basal sulcus with spirals ; mouth ovate, angulated above, with 

 the outer lip provided with 6 or 7 denticles within, inner lip 

 smooth or with 1 denticle at its posterior end ; siphonal fasciole 

 strong, bordered on the columellar side by a ridge. 

 Height 6.5, breadth 4., body-whorl 4.25 mm. 



A small species, somewhat like N. bidentata Emmons, but 

 with different spirals and mouth characters. 

 Miocene ; Alum Bluff, Fla. 



Nassa consensoides, n. sp., Plate 2, Fig. 10 



Shell small, with a large rounded body-whorl and a pointed 

 spire ; rather numerous, low, straight ribs, which are crossed 

 by unequal spiral bands ; nucleus of 3 pointed whorls, smooth 



