Nigerian Eocene Mollusca. 41 



Cominella. This small species is moderately represented in the collection. 

 It is named after Prof. H. Douville", the accomplished paleontologist of France, 

 who has contributed some valuable memoirs on Tertiary faunas from Africa 

 and other countries. 



OCCURRENCE. Cuttings Nos. i, 5, 6, 10, n, 15. 

 COLLECTOR. Mr. Kitson. 



Janiopsis nigeriensis, sp. nov. 

 PLATE 4, figs. 22, 23. 



DESCRIPTION. Shell narrow, fusoid, moderately ventricose, rather deeply 

 sutured ; spire longer than body -whorl, composed of eight volutions, apex 

 obtuse, succeeded by three erect, smooth and laterally compressed whorls, 

 last whorl of equal width and length, funiculose and non-umbilicate at base ; 

 aperture narrowly ovate, slightly canaliculate posteriorly, contracted below into 

 a short, widely excavated canal ; labrum thickly margined externally, regularly 

 plicated within ; columella uniplicate below, obscurely ridged above, and with 

 a strong posterior dentiform plication ; sculpture includes a series of longi- 

 tudinal, swollen costae (nine on the last whorl) separated by moderately wide 

 furrows, crossed by thickened, equi-distant, transverse ridges, entire surface 

 covered with microscopical, closely-set longitudinal striations. 



DIMENSIONS. 



Alt. ... ... ... ... ... ... 20 millimetres. 



Lat 9 



REMARKS. There are rather more than a dozen specimens representing 

 this elegantly formed shell, its characters associating it with Rovereto's 

 faniopsis *, which was established to replace Jania 2 of Bellardi, a pre- 

 occupied name, founded on Brocchi's Murex angulosus 3 from the Upper 

 Tertiaries of Italy. The features of the aperture show a prominent plication 

 on the posterior part of the columella behind being a feeble canaliculation, 

 and a rather more oblique plication occurring in front, while on the space 



1 Rovereto : Atti. Soc. Ligust. Sci. Nat. Geogr. 1899, Vol. 10, p. 104. 



2 Bellardi : Molluschi Terziarii Piemonte, 1872, part I, p. 147. 



3 Brocchi : Conchiologia Fossile Subapennina, 1814, Vol. 2, pi. 7, fig. 16, p. 411. 



