﻿,Yol. 6 I.] TERTIARY FOSSILS OP SOMALILAND. 161 



specimens from other localities, has enabled me to prepare the 

 following notes on the examples from Somaliland now preserved in 

 the British Museum. 



Before entering upon these descriptions, it may be interesting to 

 point out that casts of Campanile have been previously mistaken 

 for Nerincea. A notable case was that of Bellardi's Nerincea Sera- 

 pidis, 1 founded on the cast of a fragmentary whorl from the 

 JSTummulitic formation of Egypt, showing internal characters, with 

 the markings of three prominent plications which were originally 

 produced by the columella. Similar fragments from Egypt are 

 in the British Museum, as well as more perfect specimens, all of 

 which exhibit this strongly -plicated columella extending through 

 the entire axis of the shell, which, as a cast either in limestone 

 or as an impression taken in ordinary modelling-wax, will produce 

 a result exactly similar to that figured by Bellardi. That is, it 

 would appear that, in all these natural casts, the original solid 

 columella has been dissolved away during the process of fossiliza- 

 tion, but not before leaving its plicated character fully impressed on 

 the internal walls of the volutions* Moreover, in all true specimens 

 of Nerincea, the outer lip is plicated as well as the columella ; but, 

 in members of the Cerithiidae, such a character is wanting. With 

 regard to another form of Nerincea described as N. suj)racretacea, 

 Bellardi, from the JSTummulitic rocks of Nice, it is possible, as 

 suggested by Stoliczka, 2 that the absence of plications on the outer 

 lip of that specimen may be due to its worn condition ; and that, 

 instead of coming from the Nummulitic rocks, it probably came 

 from the Cretaceous deposits which also occur in the neighbourhood 

 of Nice. So far, therefore, as can be ascertained, no authentic 

 Nerincea is known in the Tertiary Period, and it appears to be a 

 genus absolutely restricted to Secondary rocks. 



All these large forms of Campanile appear to be characteristic 

 of Middle Eocene times. F. Bayan has described and figured 

 G. Bedechei, with a basal diameter of 61 millimetres, from the Paris 

 Basin, as well as C. Lachesis, measuring from 65 to 90 mm., from the 

 i Nerita Schmiedeli-be&s ' of Bonca. 3 From Asia Minor, A. d'Archiac 

 figured and described C. Tchihatcheffi, which has a basal measure- 

 ment of 90 mm., and is found associated with Nummidites Ramondi 

 and N. scabra ; also C. Leymeriei, with a basal width of 140 mm., 

 from the same horizon. 4 



Campanile cf. giganteus (Lamarck) Var. A. (PL XVII, fig. 1.) 



Gerithium gigantewm, Lamarck, Ann. Mus. Hist. Nat. Paris, vol. iii (1803) p. 439 ; 

 J. Sowerby, ' Mineral Conchology ' vol. ii (1818) p. 199 & pi. clxxxviii, fig. 2 ; 



1 'Mem. R. Accacl. Sci. Torino, ser. 2, vol. xv (1855) p. 178 & pi. i, fig. 9. 



2 ' Palaeont. Indica : Cretaceous Fauna of Southern India,' Mem. Geol. Surv. 

 India,, vol. ii (1867-68) p. 179. 



3 * Etudes faites dans la Collection de 1'Ecole des Mines : Fossiles nouveaux 

 ou mal connus ' Fasc. i, Moll. Tertiaires, 1870, pp. 31-33. 



4 In Tchihatcheff's <Asie Mineure' Paleontologie (1866-69) pp. 126-29 & 

 pi. i, figs. 1-2, pi. ix, figs. 2-3, & pi. ii, fig. 1. 



Q.J. G.S. No. 241. m 



