Nigerian Eocene Mollusca. 55 



Lutetian- Bartonian beds of England and Europe, but they are more rounded 

 at the periphery, true forms of the species being more angulate and sharp. 

 The wide and deep umbilical cavity is of similar construction and bears the 

 same character of ornamentation, consisting of finely granulate spirals and 

 radial striations, the marginal granulations of the whorls being rather larger 

 and more prominent than the remainder. Larger tubercles or nodulations 

 make up the umbilical circlets, while beyond smaller and more rounded 

 granulations form the circlets to the periphery ; the well sculptured furrows 

 of the base are furnished with stout radial plications. One of the largest 

 examples of this collection has an altitude of 6 mm. and a diameter of 12 mm. 



DISTRIBUTION. Lutetian-Bartonian of Europe, England, Egypt. 

 OCCURRENCE. Cuttings Nos. i, 6, 10, 14, 15. 

 COLLECTOR. Mr. Kitson. 



Family NATICID^. 

 Neverita cf. calvimontana (Deshayes). 



PLATE 5, figs. 16, 17. 

 Natica calvimontana. 



Deshayes : Desc. Anim. Sans. Vert. Coq. Foss., Paris, 1864, Vol. 3, p. 60, pi. 68, figs. 9, 10. 



Neverita calvimontensis . 



Cossmann : Ann. Soc. R. Mai., Belgique, 1888, Vol. 23, p. 163. 



REMARKS. This shell is represented by three examples showing similarity 

 of size (25 x 22 mm.) and details of structure which strongly suggest a close 

 relationship to Natica calvimontana of Deshayes from the Lutetian of Europe, 

 and chiefly differs in possessing an obtuse apex rather than one that is 

 somewhat acute as mentioned in the original diagnosis, apice acutiuscula. It 

 preserves the same depresso-globose form besides having a widely spreading, 

 short, conical spire minutely canaliculated at the suture, whilst the base is 

 furnished with a prominent funiculate callosity which merges into the posterior 

 regions of the columella. In many of its characters, as with the European 

 shell, it closely resembles Natica josephinia Risso's type of Neverita (Hist. 

 Nat. Europe Meridionale, 1826, Vol. 4, p. 149), found in the Upper Tertiaries 

 and Recent seas (Mediterranean), a fact already alluded to in M. Cossmann 's 

 notice of this species. This shell differs also from Neverita cleopatrae, 



