48 R. BULLEN NEWTON on 



Terebralia, sp. B. 



PLATE 4, fig. n. 



DESCRIPTION. Shell elongately conical, whorls compressed and on the same 

 plane, basal whorl about twice the height of the penultimate ; each whorl 

 ornamented with 20 closely set, slightly oblique, perpendicular costae, crossed 

 by about 10 closely fitting spiral ridges forming at their junctions regular 

 columns of depresso-rounded tubercles which constitute the costae, thus pro- 

 ducing more or less tubercled serrations at the suture. 



DIMENSIONS (fragmentary specimen). 



Length ... ... ... ... 37 millimetres. 



Diameter ... ... ... ... ... 17 



REMARKS. The only example of this form is unfortunately imperfect, its 

 apex being absent while its principal basal characters are also wanting. About 

 5^- whorls are preserved, all of which are on the same plane having flattened 

 sides, the peripheral region of the last volution being fairly rounded. It has 

 generic relations with the shell previously described as Terebralia sp. A., 

 but differs in its very much closer ornamentation, and rather more depressed 

 whorls. There is, however, another species, described by Oppenheim from 

 the Upper Mokattam deposits of Egypt (Palaeontographica, 1906, Vol. 30, 

 part 3, p. 285, pi. 25, fig. n), Cerithium apisidis, which shows considerable 

 resemblance. Nevertheless that shell, although bearing a very similar contour 

 and sculpture has less regular costse on account of varicose interruptions 

 which are not observable in the Nigerian shell. 



OCCURRENCE. Cutting No. 12. 

 COLLECTOR. Mr. Kitson. 



Family TURRITELLID^. 

 Turritella mauryana, sp. nov. 



PLATE 5, figs. 4-6. 



DESCRIPTION. Shell thick, elongately conical, pagodiform ; whorls about 

 twenty-two, flattened, excavated, finely and deeply sutured, with a projecting 

 subhorizontal shelf at two-thirds the depth of the whorl, the anterior space 

 beyond concave to the suture ; labrum deeply sinuated ; whorls covered 



