﻿170 ME. E. B. NEWTON ON THE [Feb. I905, 



This species is represented by fragmentary specimens showing a 

 variation in size, the most perfect of which possesses both valves 

 and is of medium measurement (see dimensions as above) ; two 

 fragments of considerably larger specimens exhibit the sculpture- 

 characters in a good state of preservation. It differs from SjMiidylus 

 cegyjostiacus in its surface-ornamentation, having ribs of only one 

 order, that is, without secondary or intermediate ribs ; in the closely- 

 imbricated character of its costse ; and in its nearly-equivalve 

 condition. The fragment from Bur Dab, referred to by me, in 

 Prof. Gregory's paper, as belonging probably to a new species of 

 Pecten, is, on comparison with the later improved material, found 

 to be a fragment of the Sponclylus now described. 



Localities. — Top of Garrasgooi Mountain, at an elevation of 

 about 5200 feet ; and Bur Dab. 



Collectors. — Major B. G. Edwards Le'ckie and Mr. F. B. 

 Parkinson. 



Matrix. — Cherty limestone, red-stained externally. 



LlTHOFHAGA sp. (PI. XXI, fig. 7.) 



Modiola Ferreti, R. B. Newton in Gregory, Quart. Journ. Geol. Soc. vol. lvi (1900) 

 p. 43; 11011 A. T. de Rochebrune. 



These examples of a Litliophaga are represented by crypts, con- 

 tained in a compound coral which Prof. Gregory has named Prion- 

 astrcea crassisepta. The molluscan part of this fossil was erroneously 

 identified by me in Prof. Gregory's paper as Modiola Ferreti, a 

 species described by Dr. A. T, de Rochebrune 1 from the Antalo 

 Limestones of Abyssinia, and supposed by that author to be of 

 Xeocomian age. Unfortunately, a very feeble description was given 

 of the species, and unaccompanied by figures. It would appear, 

 however, from the obscure nature of the Somaliland specimen, of 

 which the crypts only are seen, that the cavities are more cylindrical 

 than those from Abyssinia, their diameter measuring 12 millimetres. 

 Beyond this there are no decided characters to speak of, although 

 the lithological aspect of the specimens corresponds with other 

 examples of the Lower Limestone fossils in the collections under 

 description. 



Locality. — Dobar, south of Berbera. 



Collector.— Mrs. Lort-Phiilips. [B.M.— L. 14928.] 



Matrix. — Creamy-white limestone, equivalent to the ' Dobar 

 Limestone ' of Prof. Gregory. 



Ltjcina cf. gigantea, Deshayes. (PI. XX, fig. 3.) 



Lucina gigantea, Deshayes, ' Description des Coquilles Fossiles des Environs de 



Pans ' vol.i (1825) p. 91 & pi. xv, figs. 11-12. 

 Pseudomiltha gigantea, Fischer, 'Manuel de Conchy liologie ' fasc. xi (1887) p. 1144. 

 Lucina (Miltha) gigantea, Gregorio, ' Monogr. Foss. Eoceniques (Parisien) de 



Mont Postale ' Ann. Geol. Pal. Palerme, pt. xiv (1894) p. 35 & pi. vii, figs. 208- 



216. 

 i 



1 ' Mission G. Revoil aux Pays Comalis : Observations Geol. & Paleont.' 1882, 

 p. 10 [Lithodomus Ferreti], 



