﻿Vol. 6 I.] TERTIARY FOSSILS OE SQMALILAND. 169 



present imperfect material, especially as the specimen here figured 

 is without hinge or internal characters. It might even represent 

 the upper valve of a Gryphcea, similar to the larger form referred 

 to in this paper. 



Dimensions in millimetres. 

 Umbono-ventral =58 | Antero-posterior (about) =37 



Locality. — Garrasgooi Mountain, about 5200 feet above sea- 

 level, south-west of Sheikh. 



Collector. — Major R. G. Edwards Leckie. 



Matrix. — Cherty limestone, coloured reddish-brown externally. 



Spoxdylus xEOYptiacus, R. B. Newton. 



Spondylus cegyptiacus, R. B. Newton, Geol. Mag. 1898, p. 536 & pi. xx, figs. 4-6 ; 

 Cossmann, Bull. Inst. Egyptien, ser. 4, no. 1, fasc. vi (1901) p. 190 & pi. ii, 

 fig. 21 ; P. Oppenheim, Palaeontographica, vol. xxx, pt. iii (1903) p. 63 & 

 pi. iii, figs. 1-2. 



The examples referred to this species are very fragmentary, 

 although showing typical sculpture - details, including the two 

 orders of radial eostse, presenting a more or less zoned appearance 

 caused by the occasional presence of finer costae between the 

 interstitial spaces. The costse also exhibit minute spinous projec- 

 tions, an additional character pointed out by M. Cossmann since 

 the publication of the original description. 



This species was first described from the Eocene of Egypt, and it 

 has since been identified from the same country by M. Cossmann 

 and Dr. Paul Oppenheim, in rocks of similar age. 



Localities. — Hill about 4 miles south of Upper Sheikh at a 

 height of 5000 feet ; top of Garrasgooi Mountain, about 5200 feel, 

 south-west of Upper Sheikh ; Bur Dab. 1 



Collectors. — Major E. G. Edwards Leckie and Mr. E. B. 

 Parkinson. 



Matrix. — Cherty limestone, of reddish colour externally. 



Spoxdylus somaliexsis, sp. nov. (PL XXI, figs. 5, 6, & 6 a.) 



Species of variable size, sub-ovate, regularly convex, and nearly 

 equivalve ; external surfaces ornamented with numerous (probably 

 about 60) well-defined, rounded, longitudinal costa), all of one order, 

 which are covered with frequent infundibuliform annulations having 

 thin and elevated margins : these occasionally protrude beyond the 

 others to form spinous projections, more especially on the lateral 

 regions. The costse are separated by extremely narrow and rather 

 deep grooves; the hinge-line is short, with its umbono-lateral areas 

 obliquely ribbed. No internal characters are seen. 



Dimensions in millimetres. 



(Imperfect specimen with con- 

 tiguous valves.) 

 Umbono-ventral =42 



Antero-posterior (about) =28 



Maximum depth =28 



1 Fragments referred to a Cenoinanian age under the name of Spondyhis$$.> 

 by R. B. Newton, in Gregory, Quart. Journ. Geol. Soc. vol. lvi (1900) p. 43.. 



