Nigerian Eocene Mollusca. 43 



REMARKS. Only one specimen represents this species, which, with the 

 exception of an absent protoconch, is in an excellent state of preservation. In 

 contour it bears some resemblance to the original figure of Brocchi's Valuta 

 varicosa, the type of Jousseaume's genus, Sveltia, of 1888, from the Italian 

 Pliocene formation (Conch. Foss. Subapennina, 1814, Vol. 2, p. 311, pi. 3, fig. 8), 

 although differing in the possession of an umbilicus. It is related, likewise, to 

 De Blainville's Trigonostoma, founded on the Lamarckian type of Cancellaria 

 trigonostoma, of Eastern Seas, but shows no disjointed or staged character of the 

 whorls, and is moreover without the prominent sutural platform of that genus, 

 the ends of the swollen costae touching the suture, and being a generally rounded 

 and much less angulate shell. It is apparently an intermediate form between 

 these two genera, Cancellaria and Trigonostoma, and from the absence of further 

 examples is provisionally regarded under the more comprehensive term of 

 Cancellaria. One unusual peculiarity of the shell is the presence of three 

 weaker folds on the posterior surface of the columella, in addition to the ordinary 

 plications of the antero-central region ; hence the creation of the specific name, 

 multiplicis, which it is proposed to bestow upon this shell. 



OCCURRENCE. Cutting No. 12. 

 COLLECTOR. Mr. Kitson. 



Trigonostoma deoorata, sp. nov. 

 PLATE 5, figs. 18, 19. 



DESCRIPTION. Shell turriculate ; spire equal in height to the body whorl, 

 composed of five whorls, which, with the exception of those forming the proto- 

 conch, are suturally excavated, and staged, besides bearing irregular, marginal, 

 vertical, spinose projections, nearly three volutions forming the protoconch, 

 which are smooth, the basal being well elevated, plano-convex, apex rounded and 

 obtuse ; base exhibiting a small slit-like umbilicus ; aperture trigono- angulate, 

 obtusely spined posteriorly, excavated below into a short, wide, canal-like 

 furrow ; labrum rounded, posteriorly angulate and horizontal, plicated within, 

 and varixed externally ; columella triplicated, an upper, and two nearly 

 contiguous folds below, on the space between being a small rounded tubercle ; 

 sculpture comprises numerous longitudinal costae, including a more inflated 

 series at equally spaced distant intervals, and a finer series of two or three 

 occurring between, these are crossed by many equi-distant transverse ridges ; 



