644 MR. R. B. NEWTON ON [Nov. I9II, 



that he had seen some indeterminable fragments resembling Ostrea 

 cyaihula var. fimbriata, and Pecten (Neithea) araiatus, both forms 

 characteristic of the Lower Tongrian, about 10 miles west of Cairo, 

 at Xum el Kashab, an area where the fossil trees occur. 



Occurrence. — Some of the specimens are associated with a 

 cream-coloured, more or less compact, limestone weathering reddish- 

 brown ; the example from Messa is in a yellowish, sandy-looking, 

 calcareous matrix ; and another from near Bint, east of Derna, is 

 found in a rather fragmental limestone varying from reddish brown 

 to somewhat of a straw-colour. All the matrices contain an 

 abundance of Nwnmulites. 



Localities- — After Merj, the plateau to the south-west ; wells 

 at Merj ; near Slonta ; east of Slonta ; Messa ; Kuff Narbea, north 

 of Wadi Eiryah ; Mersa Susa ; near Bint, east of Derna. 



vEquipecten cf. deletus (Michelotti). 



Pecten deletus Michelotti, ' Etudes sur la Miocene Inferieur de ritalieJSepten- 

 trionale' 1861 [Mem. Soc. Holl. Sci. Haarlem], pi. ix, figs. 1-3 & p. 77. 



JEquipecten deletus and varieties, ' Sacco, Moll. Terr. Terz. Piemonte' 1897, 

 pt. 24, pi. vi, figs. 1-7 & p. 19. 



Remarks. — A single valve in the matrix showing only the basal 

 area is, on account of the structure of the costce, thought to be 

 related to P. deletus of Michelotti, from the Tongrian of Northern 

 Italy. These costae, of which about eight are preserved in the 

 specimen, are fairly broad, rounded, and furnished with somewhat 

 coarse annulations ; they are separated by deep sulcations of equal 

 width with the costae, the interiors of which are ornamented with 

 four or five longitudinal rows of minute granulations. 



Occurrence. — The specimen is associated with a cream- 

 coloured limestone made up of Lithothamnion, Nummulites, etc. 



Locality. — Derna. 



iEQUIPECTEN CYRENAICTJS, Sp. nOV. (PI. XLVI, figS. 1 & 2.) 



Description (lower or right valve). — Shell fan-shaped, inequi- 

 lateral, shallow, covered with about eighteen straight radial costae, 

 medially angulate, laterally oblique, aud divided by widely open 

 V-shaped furrows ; grooves and ribs ornamented with narrow, 

 closely-set, equally-banded annulations, which show a thickening 

 or tuberculation on each side at the bases of the sulcations ; 

 posterior expansion (only partly preserved) with three or four 

 oblique rows of small contiguous granulations. 



Dimensions: — Length = 55 mm. ; height (about) =50 mm. 



E em arks. — The suborbicular or fan-shaped contour of this valve 

 would associate it with the P. -opercular is type of pectinoid shells, 

 and therefore it should be regarded as belonging to Fischers genus 

 Mquipecten. The ornamentation of the costae and furrows is 

 singularly different from that seen in other forms of this genus. 

 There are no striations radiating from the umbonal region, the 

 sculpture being entirely composed of the closely-fitting, equally 



