458 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 18, 



Shell discoidal ; spire small ; whorls 5, rounded, transversely 

 striated, and partially reticulated by encircling lines. The tranverse 

 striations are strongest at the upper part of the whorls next the 

 suture, and form crenulations at the umbilicus, which is small ; 

 mouth round. 



This beautiful little Solarium appears to be not uncommon in this 

 deposit, three very perfect specimens ha\'ing been extracted from 

 one small piece of the soft greenish sandstone in which they are 

 imbedded. 



Locality. — Cliffs of the coast of S. Africa, near the Umtafuna and 

 Umzambani Rivers. 



Genus Turritella, Lamarck. 



TURRITELLA BoNEI, nOV. Sp. PI. XII. fig. 7. 



T. testa conica; anfractibus 12, convexis, transverse 3-costatis ; 

 costis simplicibus ; suturis profundis ; apertura subquadrata ; 

 basi convexo. 



Length, 2 inches. 



Breadth of last whorl, y^^ths of an inch. 



Shell moderately elongated, tapering, with about 1 2 rather ventri- 

 cose whorls, divided by a deep suture. The whorls have three large 

 ridges, not granulated, and are numerously striated spirally ; the base 

 is convex, and the aperture round. 



It is allied to Turritella difficilis of D'Orbigny, from the Craie 

 Chloritte of France, but differs in having fewer ribs, and in being 

 striated in the interspaces ; it also bears a considerable resemblance 

 to Turritella monilifera from Pondicherry. 



Named after Mr. C. Bone of the Geological Survey. 



Locality. — Cliffs of the coast of South Africa, near the Umtafuna 

 and Umzambani Rivers. 



Turritella Meadii, nov, sp. PI. XII. fig. 6. 



T. testa conica; anfractibus 12, transversim insequaliter striatis, 

 longitudinaliter plicatis ; plicis flexuosis j suturis profundis ; aper- 

 tura, ovali. 



Length, yV^^^ ^^ ^^^ inch. 

 Breadth of last whorl, y^o ^^^ ^^ ^^ inch. 

 Shell conical ; whorls 1 2, unequally and faintly striated by trans- 

 verse and longitudinal flexuous plications ; aperture oval. 



Found associated with Ammonites Umbulazi in compact siliceous 

 grit. 



Named after Mr. Mead of the Geological Survey. 

 Locality. — "White-men's Houses," near the Umzambani River, 

 S. Africa. 



Turritella Renauxiana, D'Orbigny, Ter. Cret. pi. 1.52, figs. 1-4. 

 A much-worn specimen from Umpahlanayani River, included in 



