94 INVERTEBRATA. 



Nertn^a, sp. 

 (Plate III., fig. 7.) 



A tall turreted shell resembling the Turitella nerincea of 

 Geinitz. We know of only two specimens from Upware, and per- 

 haps another from Atherfield. These indicate a variable species, 

 and do not afford sufficient materials for specific identification or 

 diagnosis. The whorls are concave, being strongly margined at 

 each suture. One specimen shews some spiral striations, but the 

 other is smooth. 



Localities. Upware, Atherfield (?). 



Nerin^a tumida (n. sp.). 

 (Plate III., ^g. 8.) 



Shell thick, elongated, tumid, many-whorled, smooth. Whorls 

 narrow, simple, convex ; sutures rather deep, very transverse. 

 Base much contracted, umbilicus wanting. Mouth sub- quadrate ; 

 siphonal canal rather prominent, slightly tortuous ; columellar lip 

 straight. Two broad faint grooves seen in places upon the inside 

 cast indicate slight spiral thickenings of the outer wall. 



Measurements of type (see figure) : Length (of fragment) 3 J 

 inches ; breadth at top, 22 mm. ; at base, 35 mm. ; height of 

 penultimate whorl, 13 mm. ; angle of spire, 13". 



Only two specimens are known, but these indicate a well- 

 marked species, the general tumid, almost pupoid appearance of 

 the shell being very distinctive. The convexity of the whorls and 

 contracted base distinguish it from N. Banga, d'Orb., and from N. 

 depressa, Voltz., to which it has most general resemblance. It is 

 separated by the absence of an umbilicus. 



Locality. Upware. 



TrochUS, n. sp. 

 (Plate III., fig. 9, «, b.) 



A trochiform shell allied to T. Oosteri (P. and C.) of the Aptien 

 Inferieur of St Croix. It is regularly pyramidal, or with the 

 apex slightly produced ; base nearly flat, gently convex ; no 

 umbilicus. 



