208 GASTEROPODA OF THE INFERIOR OOLITE. 



p. 28, pi. ii, fig. 4), but M. Rigaux considers the differences too great for both to 

 be placed under the same species. The figure (PL XIV, fig. 8) is composite. 

 This form, and others not very dissimilar to it, are moderately abundant at Great 

 Ponton. Some of these varieties may have been taken for Nerinsea Voltzii, which 

 species I have not myself found, as yet, in any beds of the Lincolnshire Limestone. 



142. Nebin^ea cf. Stricklandi, Morris and Lycett, 1851. Plate XIV, fig. 9. 



1851. Neein^a Stricklandi, M. and L. Great Ool. Moll., p. 35, pi. vii, fig. 9. 



Bibliography, cjx. — The types, from the Stonesfield Slate on the borders of 

 Minchinhampton Common, are fragmentary, and the character of the folds was 

 unknown to the authors. The proportions of the whorls, moreover, are not quite 

 the same as in the Lincolnshire Limestone fossil. Hence the identification is 

 provisional. 



Description : 



Spiral angle (somewhat irregular) . . 10°. 



Height of whorl to v/idth (variable) . . 1 : 1*45. 



Approximate length . . . .110 mm. 



Shell elongate, subulate, dimorphous. Whorls about twenty, flat, and increasing 

 by steps, which become less salient and finally disappear. There is an irregularity 

 in the development of the later whorls, some of which project more than others. 

 Columella ? hollow ; umbilicus closed. The subapical whorls carry numerous fine 

 spiral lines, which are slightly granulated ; the adult whorls are smooth. 



Body- whorl short, smooth, and rather projecting ; aperture subquadrate. 

 Section triplicate, the anterior fold in the columella being low and very small, as 

 in the two preceding species. 



Relations and DistrihutiQ7i. — Specimens being fragmentary, no one specimen is 

 available for showing all the characters. Fig. 9 is composite. The more apical 

 portions have a strong resemblance to Morris and Lycett's figures, whilst the rest 

 of the shell again reminds us of N. Sharmanni. From iV^. subglabra it is distin- 

 guished by its smaller spiral angle, more elongate form, and shorter whorls ; also 

 by the irregularity of its development, and the step-like character of the earlier 

 whorls. Nevertheless, N. StrickUindi (as identified), N. subglabra, and the un- 

 named form (PI. XIV, fig. 6) have an internal structure which is very similar, 

 the columella apparently having been hollow with a closed umbilicus, whilst the 

 anterior fold on the columella is low down and extremely small. 



Not uncommon in the Lincolnshire Limestone at Great Ponton ; occurs also at 

 Weldon. 



