Jurassic Fauna from Central Arabia. 401 
came from El] Hish. The appended “Chart” (p. 402) will 
serve to show the elements of this fauna and its distribution, 
both geological and geographical. 
Some of the specimens, although mostly imperfect, have 
exhibited structures that have allowed of a fairly close 
determination, and it is certain that they may be recognized 
as belonging to the Sequanian and Kimeridgian stages of 
Upper Jurassic times. Evogyra bruntrutana, however, 
occurs also in the Portlandian, although originating in the 
Oxfordian, whereas Chlamys articulatus ranges from Ba- 
thonian to the Kimeridgian, and the Polyzoan is apparently 
only known in the Bathonian stage. The Nerinea has 
already been noticed as occurring in Upper Jurassic rocks 
north of Aden, the Bachain fragments of this genus being 
associated with equally well-known fossils that present the 
Sequanian—Kimeridgian facies. 
It is interesting to note a faunistic resemblance with Upper 
Jurassic fossils of Somaliland and Abyssinia, described 
respectively by Dacqué* and Futterer f, and which also 
extends to European and British faunas of the same period. 
For the present, therefore, this fauna may be regarded as 
of Sequanian (=Corallian)—Kimeridgian age, although it is 
hoped that future explorations will yield a greater variety of 
better-preserved and more abundant specimens, and so enable 
us to gather further information on Arabian Jurassic 
stratigraphy. 
Finally, congratulations are due to Mr. Philby on his 
obtaining these relics of a marine fauna from an entirely new 
region of Arabia, and therefore materially increasing our 
kuowledge as to the extent of those marine conditions which 
prevailed over so great an area of that country during 
the Jurassic period. 
EXPLANATION OF PLATE XI. 
Nerinea cf. desvoidyt, Orbigny. 
Fig. 1. Natural cast of two of the older volutions, showing the median 
groove. 
Lopha (?) philbyi, sp. n. 
Tig. 2. External view of a lower valve, showing the divided radial 
* “ Beitrige zur Geologie des Somalilandes-Oberer Jura,” Beitr. Pal. 
Geol. Osterr.-Ungarns Orients, 1905, vol. xvii. pp. 119-159, pls. xiv.—xviii. 
+ “Beitraye zur Kenntniss des Jura in Ost-Afrika: Der Jura von 
Schoa (Sud-Abessinien),” Zeitsch. Deutsch. Geol. Ges. 1897, vol. xlix. 
pp. 568-627, pls, xix.-xxil. 
