Nigerian Eocene Mollusca. 35 



The sculpture consists of strong spiral ridges and grooves crossed by fine 

 longitudinal striations ; there are besides two distant but parallel rows of 

 canaliculated spines on the body-whorl, the older or posterior series forming 

 the periphery being much the larger and more prominent. It is this double 

 row of spines more particularly which characterises Conrad's Cornulina of 

 which the type is Solander's Murex minax. This species differs from 

 Conrad's originally described form of Monoceros armigerus from the Alabama 

 Eocene deposits, afterwards recognised by Conrad as belonging to Cornulina, 

 in possessing depressed and more angulate whorls besides having a greater 

 number of peripheral spines in each of the rows, the American shell having 

 a very globulose body-whorl which is furnished with more distantly arranged 

 spines. The best interpretation of Conrad's genus is that offered by M. 

 Cossmann in his work quoted above. 



The species is characteristic of the Lutetian formation although occurring 

 in Bartonian and rarely in slightly higher horizons. 



DISTRIBUTION. British and European. 

 OCCURRENCE. Cutting No. 6. 

 COLLECTOR. Mr. Kitson. 



Bulbifusus nigeriensis, sp. nov. 

 PLATE 4, figs, i, 2. 



DESCRIPTION. Shell thin, nearly smooth, ovato-fusiform, inflated ; spire 

 conically acuminate and obtusely pointed, comprising 7 or 8 thinly sutured, 

 depresso-convex whorls, the penultimate being about twice the depth of the 

 preceding ; body-whorl i\ times the length of the spire, spirally and narrowly 

 banded below the suture, elongately inflated, terminating with a short and 

 wide canaliculation ; aperture elongately oval, labrum margin simple, excavated 

 posteriorly and anteriorly, outwardly curved, internally plicated ; columella 

 excavated, slightly twisted at the base with an obscure and elongate fold, 

 callosity rudimentary or absent ; surface of nuclear whorls ( = I ) smooth, 

 remainder covered with extremely fine, close, longitudinally sinuous lines 

 crossed by nearly obsolete, spiral striations. 



3* 



