464 MR. H. BOLTON ON A MARINE FAUNA IN THE [Nov. I907, 



It differs from the Natkopsis brevispira (de Ryck.), as figured by 

 Dr. Wheelton Hind, in the greater gibbosity of the shoulder of the 

 whorls and in the higher and more acute spire, while the spiral 

 angle is much less. The mouth is thickened on the inner border. 



Loxonema cf. scalaroideum, Phillips. (PI. XXX, fig. 1G.) 



Fragmentary shell showing portions of the three last whorls. 

 The shell-ornament consists of strongly-raised, somewhat angular 

 vertical ribs, with deep concave interspaces. In general character 

 the specimen agrees with L. de Koninck's description of Phillips's 

 species. It differs from Loxonema acutum, de Kon., in the ribs being- 

 straight instead of curved. 



Loxonema ashtonense, sp. nov. (PI. XXX, figs. 17 a— 17 c.) 



Height averaging 3 mm., but a few measure 4 mm. and 5 mm. 

 Whorls varying from six to eight in number, each whorl being 

 about double the height of the preceding one, and the last whorl 

 considerably swollen. Ornamented by six to eight sharp longi- 

 tudinal striae. Indications appear in one specimen of the mouth- 

 aperture, which is in the form of an elongated oval. The upper 

 border of each whorl sharply and flatly inclines forwards to the 

 suture, so that the whorls appear almost disconnected or but lightly 

 touching. 



Numerous examples occur in close association with Lingula 

 mytiloides, Nuculana cequalis, Tellinomorpha (?) Hindii, and 

 goniatites. 



The acute spire, swollen terminal chamber, and longitudinal 

 strise render this species easily recognizable. This form is very 

 abundant throughout the ' shell-bed.' 



Katicopsis (?) disjuncta, sp. nov. (PI. XXX, figs. 18 a & 18 b.) 



Three little shells were found, possessing a very small acute spire 

 of two or three whorls, beyond which the shell rapidly broadens 

 out, a portion of the last whorl being discontinuous. The general 

 habit suggests Naticopsis, but the small size, discontinuous last 

 whorl, and also its development, almost on a horizontal plane, 

 constitute, I think, generic differences. No shell-ornament can be 

 distinguished, while the last whorls are very strongly convex. 



Cephalopoda. 



Cephalopoda are fairly numerous, and belong mainly to the 

 genus GlypJiioceras, 01. carbonarmm being especially predominant. 



Orthoceras cf. cxlindraceum, Fleming. (PI. XXX, figs. 19 a & 19 b.) 

 A remarkably-cylindrical form, in which the shell is perfectly 

 straight, very slender, and ends obtusely. Section circular ; 

 siphuncle nearer margin than centre. Surface of test smooth and 

 very faintly annulated. 



