Vol. 67.] KAINOZOIC MOLLTJSCA FRO.V CYRENATCA. 639 



exhibits an inflated body-whorl with an oval aperture of considerable 

 width, and moreover furnished with a well-rounded external margin. 

 The dorsal aspect shows an extensive basal whorl with a promi- 

 nently tabulated and oblique sutural area, above being a fairly deep 

 penultimate whorl, with a rather compressed surface. The columella 

 is obliterated by matrix. 



Dimensions. — Length = 60 millimetres; width = 57 mm. 



The specimen also shows some resemblance to Lamarck's Natiea 

 hybrida l from the European and Egyptian Eocene deposits, in 

 the possession of a tabulated suture and compressed sides to the 

 earlier whorls, but that has a comparatively shorter spire and is 

 generally of more globose contour. 



Occurrence. — This cast is associated with a cream-coloured 

 limestone, weathering reddish- brown, which is largely composed of 

 Nummulites. 



Locality. — East of Ain Hafra, east of Cyrene. 



Amptjllina crassatina (Lamarck). 



Ampullaria crassatina Lamarck, Ami. Mus. Hist. Nat. (Paris) 1804, vol. v, 



p. 33 ; and ibid. 1806, vol. viii, pi. Ixi, fig. 8. 

 Natiea 'crassatina Deshayes, 'Descr. Coq. Foss. Paris' 1832, vol. ii, pi. xx, 



figs. 1-2 & p. 171. 

 Natiea (Amjpullina) crassatina Schauroth, ' Verzeichn. Versteinerungen ' 1865, 



p. 252. 

 Natiea crassatina Fuchs, Denkschr. K. Akad. Wissensch. Wien, 1870, vol. xxx, 



p. 159. 

 Megatylotus crassatinus Sacco, ' Moll. Terr. Terz. Piemonte ' 1891, pt. 9, p. 13 ; 



and Cossmann, Journ. Conchyl. [Paris] 1892, vol. xl, p. 355. 

 Natiea (Ampullina) crassatina Mayer-Eymar, Bull. Inst. Egyptien, 1893, ser. 3, 



no. 4, p. 373. 

 Natiea crassatina Blanckenhorn, Zeitschr. Deutsch. Geol. Gesellsch. 1900, 



vol. lii, pp. 466-67. 



Item arks. — This fossil is a moderately large limestone-cast, 

 which has suffered more or less a dorso-ventral compression. In 

 general form it is transversely subovate ; the body-whorl, from the 

 dorsal aspect, is extensive and only moderately convex, and it is 

 surmounted by two earlier whorls having deep and depressed sides ; 

 otherwise, the further elements of the spire are not preserved. The 

 suture is canaliculated and slightly tabulate, and the aperture is 

 ample with a semicircular labrum, but the columelloid details are 

 mostly obscured by matrix, so that the presence or otherwise of an 

 umbilical cavity is a little uncertain. Compared with Deshayes's 

 figures, the cast in question exhibits a greater breadth, as it possesses 

 a wider aperture and a more produced curvature to the outer lip. 



Dimensions. — Length (approx.) = 75 mm. ; breadth = 70 mm. 



This species is chiefly characteristic of Lower Oligocene rocks 

 ( = Tongrian), being known from England, European countries 

 (France, Italy, etc.), and Egypt, as recorded by Mayer-Eymar and 

 Dr. Blanckenhorn. The species also extends to the Stampian stage 

 of the same period, having been identified from the ' Gomberto- 

 Schichten ' of Italy. 



1 See G. P. Beshiyes, 'Descr. Coq. Foss. Paris' vol. ii (1832) p. 172 & 

 pi. xix, figs. 17-18. 



