30 R. BULLEN NEWTON on 



REMARKS. This elegantly formed and closely ornamented shell is recog- 

 nised as a member of the Lotoriidae (or Tritoniidse) on account of the 

 rigid character of the columella, while its narrow ovate aperture and strongly 

 varixed labrum, the varix not proceeding up the spire, links it with Hoernes 

 and Auinger's l genus Hilda from the Miocene of Austro- Hungary founded 

 on their type of Triton (Hilda) transsylvanicum. It differs, however, from 

 this European species, in being wider and of more coniform shape, besides 

 possessing angulate whorls, a deeper suture, and a prominent sutural platform, 

 over the floor of which is continued the equi-distant longitudinal costae and 

 the strong spiral ridges. This shell seems to be quite unknown in Eocene 

 times, M. Cossmann's 2 analysis of the genus Hilda, including a reference 

 only to the type species from Miocene rocks. 



OCCURRENCE. Cuttings Nos. 5, 6, 10, 12, 13. 

 COLLECTOR. Mr. Kitson. 



Family MURICID^E. 

 Pteropurpura cf. tricarinata (Lamarck). 



PLATE 4, figs. 26, 27. 

 Murex tricarinatus. 



Lamarck : Ann. Mus. Hist. Nat. [Paris], 1803. Vol. 2, p. 223 ; Deshayes : Desc. Coq. Foss. Paris, 1835. 

 Vol. 2, pi. 82, figs. 7-10, pp. 597, 598 ; J. de C. Sowerby : Mineral Conchology, 1823. Vol. 5, pi. 416, 

 figs, i, p. 15. 



Pteropurpura tricarinata. 



Cossmann : Essais Paleoconchologie Comparee, 1903, part 5, pp. 18-20. 



REMARKS. This determination applies to a single specimen of moderate 

 size (36 x 1 8 mm.), which is obviously related to Lamarck's Murex tricarinatus, 

 from the European Lutetian, a species regarded by M. Cossmann as belonging 

 to M. Jousseaume's genus Pteropurpura (Revue Mag. Zoologie, 1881, Ser. 3, 

 Vol. 7, p. 334), which was founded on Murex macropterus, Deshayes of 

 recent seas. The Nigerian shell, however, has rounder varices than the true 

 M. tricarinat^^,s with no indication of a postero-lateral spine, the aperture is 

 narrowly oval instead of being widely pyriform, while the columella posteriorly 



1 Die Gasteroppden der Meeres-Ablagerungen der Ersten und Zweiten Miocanen Mediterran- 

 Stufe in der Osterreichisch-Ungarischen Monarchic (Wien), 1884, p. 182, pi. 22, figs. 17-20. 



2 Essais de Paleoconchologie Comparee, 1903. Vol. 5, pp. 106, 107, pi. 5, figs. 4, 5. 



