Jurassic Fauna from Central Arabia. 391 
(2) Hl Hish, also near Sadus, is stated to be 2800 feet 
above sea-level. An eroded and cream-coloured example of 
Isastrea, without matrix, has been found here, so that we 
would be justified in assuming that its associated limestone 
would be of similar colour. 
(3) Ashaira (long, 46°, lat. 22° 50').—The fossiliferous 
limestone of this region is cream-coloured. ‘This locality and 
the following—Hamar—are about 200 miles south of Sadus. 
(4) Hamar (long. 46° 10’, lat. 22° 30’).—The limestone of 
this locality is of ferruginous colour and frequently contains 
minute grains of peroxide of iron; it is, besides, of great 
hardness, being siliceo-caleareous, and has much the appear- 
ance of a coarse sandstone. 
The specimen from Quoin Island in the Persian Gulf is 
not organic, but is merely an example of a stalagmitic rock. 
It is of interest to mention that Mr. Philby has generously 
presented this collection of Arabian fossils to the Geological 
Department of the British Museum, and that the report 
thereon has been drawn up at the request of the Directors of 
the Anglo-Persian Oil Company, Limited. 
NOTES ON THE FOSSILS. 
CEPHALOPODA. 
Lytoceras (?). 
Under this group is included a fragmentary Ammonite 
represented by a matrix impression of part of a whorl bearing 
simple and closely-set costations. Mr. L. F. Spath, M.Sc., 
informs me that this specimen may belong to the geuus 
Lytoceras which is widely distributed, its range extending 
trom Liassic to Cretaceous times. 
Locality. Bachain. 
GASTROPODA. 
Nerinea, cf. desvoidyt, Orbigny. (Pl. XI. fig. 1.) 
Nerinea desvoidyi, Orbigny, Pal. Frangaise Terr. Jurassiques, Gastero- 
podes, 1850, pl. cclxi. p. 107. ‘ 
Nerinea cf. desvordyi, KX. B. Newton, Ann. & Mag. Nat. Hist. 1908, 
ser. 8, vol. ii. pp. 9, 10, pl. i. tig. 10. 
This form of molluse is represented by some fragmentary 
natural casts of whorls, which appear to belong to two 
individuals and which show resemblances to the specimen 
previously described by me from the north of Aden. ‘he 
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