648 ME. R. B. NEWTON ON [Nov. I9II, 



approaches more nearly, perhaps, that distinguishing L. pharaonis; 

 although the anterior side appears to be more compressed than in 

 that species, and therefore it resembles Dr. Oppenheim's type, which 

 was founded upon an internal cast from the Lower Eocene deposits 

 of Egypt. The markings on the valves, both pallial and adductor, 

 are fairly distinct, while parts of the surface exhibit concentric 

 and radial striations ; moreover, the left valve is minutely pitted, as 

 shown in Oppenheim's figure. 



Dimensions (with closed valves): — Length = 60 millimetres; 

 height = 60 mm. ; diameter=30 mm. 



Occurrence. — Specimen associated with a compact cream- 

 coloured limestone weathering yellowish or light red, which appears 

 to contain no Nummulites. 



Locality. — Wadi, first camp, west of Derna. 



Cokbis lamellosa (Lamarck). (PI. XLV, figs. 12 & 13.) 



Lucina lamellosa Lamarck, Ann. Mus. Hist. Nat. (Paris) 1806 & 1808, 



vol. vii, p. 237, & vol. xii, pi. xlii, fig. 3. 

 Corbis lamellosa Schauroth, ' Verzeichniss Versteinerungen ' 1865, p. 208. 

 Fimbria lamellosa Frauscher, Denkschr. K. Akad. Wiss. W ien, 1886, vol. li, 



pt. 2, p. 172. 

 Corbis lamellosa Cossmann, Ann. Soc. Roj r . Malacol. Belg. 1887, vol. xxii, 



p. 15 ; Oppenheim, Palaeontographica, 1903, vol. xxx, pt. 3, No. 1, p. 152. 



Remarks. — The specimen referred to this species exhibits an 

 external view of a fragmentary valve, attached to the matrix, 

 having imperfect marginal terminations. It is probably a left 

 valve — although this is uncertain, on account of the dorsal charac- 

 ters being very obscure. The sculpture is, however, important, as 

 it resembles in every way that characterizing this well-known 

 species. The equidistant, prominently concentric laminse are well 

 seen, together with the closely- arranged vertical striations which 

 occur between them. 



According to M. Cossmann, this shell ranges through all the 

 stages of the Eocene formation. Schauroth has determined it 

 from the Bartonian Beds of Ronca in Northern Italy, Frauscher 

 has recognized it in the Lower Eocene deposits of the Northern 

 Alps, while Oppenheim refers to its occurrence in the Mokattam 

 Beds of Egypt. Corbis pseudolamellosa of the last-named author, 1 

 from the Priabonian formation of Northern Italy, shows also some 

 striking resemblances to the specimen from Cyrenaica. 



Occurrence. — In a cream-coloured limestone weathering 

 reddish, associated with Nummulites. 



Locality. — Near Slonta. 



Mactea cf. fourtatji Cossmann. 



Mactra fourtaui Cossmann, Bull. Inst. Egyptien, 1901, p. 184 & pi. iii, figs. 18, 

 20; Oppenheim, Palaeontographica, 1906, vol. xxx, pt. 3, No. 2, p. 189 & 

 pi. xix, figs. 7-8. 



Remarks. — This specimen, although only a cast, has much the 



1 P. Oppenheim, ' Eivista Ttaliana di Paleontologia ' vol. vi (1900) p. 32 & 

 pi. i, figs. 3-3 a. 



