532 R. Bullen Neivion — Egyptian Lower Tertiary Shells. 



MOLLUSCA: GASTEEOPODA. 

 Genus MITRA, Chemnitz. 

 Conchylien -Cabinet, vol. iv (1780), p. 205, pi. cxlvii, fig. 1,360. 

 Type. — Valuta episcopalis, Linna9us. 



MiTRA TURRICTJLATA, Scliafhiiutl. (PI. XIX, Fig. 1.) 



Milra turriculata, Schafhautl, " Siid-Bayerns Leth. Geogn. Kressen- 

 berg," 1863, p. 209, pi. lii, fig. 5 ; Fraas, " Aus dem 

 Orient," 1867, p. 149. 

 Description. — Species narrow, elongate, fusiform ; whorls deep, 

 flattened, turriculate, and canaliculated at the suture ; aperture 

 elongate and narrow ; columella slightly oblique. 

 Dimensions. 



Largest specimen — Length ... ... ... ... 55 mm. 



Diameter ... ... ... ... 23 mm. 



Remarks. — The Egyptian specimens referred to this sppcies appear 

 to be in every way analogous to the type from the Kressenberg 

 Eocene, examples of which in the British Museum have been 

 available for comparison. Like the type they ai'e mere casts, 

 showing rather long and prominent turriculate spires with depressed 

 whorls and a sutural canaliculation. The matrix is a light yellowish 

 foraminiferal limestone. 



Horizon. — Middle Eocene (Mokattam Series). 



Distribution. — Kressenberg. Egypt: Mokattam (Fraas) ; Minyeh. 

 Coll. Geol. Surv. Egypt (No. 848, Box No. 50c). 



Genus HIPPOCHRENES, Montfort. 

 Conch. Syst., vol. ii (1810), pp. 522, 623. 

 Type. — Stromhiis ampins, Brander. 



HippocHRENES, sp. (PI. XIX, Fig. 2.) 

 Remarks. — This genus is represented by four specimens in 

 a somewhat worn condition, without aliform expansions or complete 

 anterior canals. An attachment line is, however, present on the side 

 of the spire, which denotes the position either of a former decumbent 

 canal, as in M. columharins, or a large expansion such as characterizes 

 H. ampins. The first-named species, already recorded from Egypt 

 by Bellardi,^ is a perfectly smooth form without any spiral striations. 

 A spiral sculpture is observable on the present Egyptian specimens, 

 the lines being almost horizontal, though becoming more oblique and 

 closer together at the anterior prolongation. Such ornamentation 

 would suggest affinities with H. am-plus, but in the absence of other 

 details it is not desirable to attempt a specific determination of 

 remains so incomplete. They are of fusiform shape, having a short 

 conical pointed spire and an inflated body-whorl. 

 Dimensions. 



Chief specimen — Length ... ... ... ... 40 mm. 



Diameter 22 mm. 



1 " Cat. Foss. Nummiilitid d'Egitto" : Mem. R. Ac. Sci. Torino, 1854, p. 178. 



