54 R BULLEN NEWTON on 



in its diameter to half that of the shell, with a crenulated margin ; aperture 

 rhomboidal. Height about half the diameter of the base. Covered within the 

 umbilicus, as well as over the other parts, with alternately linear and 

 granulated ridges, which are largest towards the upper edges of the whorls 

 and the margin of the umbilicus." The Nigerian adult forms of this apparently 

 related shell are of smaller size than those from Sussex, the former showing 

 an altitude of 13 mm. and a diameter of 25mm., while the latter measure 15 

 by 32 mm. Most of the characters referred to in the original diagnosis are 

 quite well represented in the examples from Africa. There is besides a well 

 pronounced canaliculation surrounding the suture noticeable in both shells from 

 these widely separated localities. The alternately linear and granulate character 

 of the spiral ornamentation is also well displayed on the upper surface while 

 the base shows a well separated series of granulate spiral lines with, however, 

 only one or two intervening lineations, these latter being much better expressed 

 and more numerous in the English type. The sculpture of the deep and 

 wide umbilical cavity shows the marginal ridge composed of robust granulations 

 while rows of smaller and more delicate tubercles ornament the internal walls ; 

 the peripheral edge of the Nigerian shell should be mentioned as being 

 obtusely angulated rather than acute as in the British species. This species 

 evidently belongs to Dr. Dall's Solariaxis, which was established on Conrad's 

 Solarium elaboratum from the Claiborne Eocene of the United States (Trans. 

 Wagner Free Inst. Sci. Philadelphia, 1892, Vol. 3, part 2, pp. 323, 324). 

 It is abundantly represented in the Nigerian deposits. 



DISTRIBUTION. Lutetian, England. 

 OCCURRENCE. Cuttings Nos. 6, 12, 13, 15. 

 COLLECTOR. Mr. Kitson. 



Solariaxis cf. canaliculata (Lamarck). 

 Turbo. 



Solander : Brander's "Foss. Hantoniensia," 1766, p. 10, pi. I, figs. 7, 8. 

 Solarium canaliculatum. 



Lamarck : Ann. Mus. Hist. Nat. Paris, 1804, Vol. 4, p. 53 ; Deshayes : Desc. Coq. Foss. Paris, 1832, 

 Vol. 2, p. 220, pi. 24, figs. 19-21 ; Oppenheim : Palaeontographica, 1906, Vol. 30, part 3, pi. 20, fig. 13, p. 231. 



Solariaxis canaliculata. 



Cossmann : Fssais Pal^oconch. Comp., 1915, Vol. 10, p. 170, pi. 6, figs. 37-39- 



REMARKS. There are several examples of a small sized, rather compressed 

 and suturally grooved shell which resemble Solarium canaliculatum from the 



