Jurassic Fauna from Central Arabia. 397 
Distribution. Upper Sequanian (Astartian) to the Kime- 
ridgian: Britain, Europe, and Africa (Shoa and Somaliland). 
Loeality. Bachain. 
Ithynchonella sp. (Pl. XI. fig. 11.) 
This form appears to come nearest to Dacqué’s * FR. sp. ind. 1 
from the Sequanian (= Malm) of Somaliland. It is attached 
by the ventral or pedicle valve to a hard limestone-matrix, so 
that only the dorsal or brachial valve is exposed, with a part 
of the projecting beak of the opposing valve. The deltidial 
characters are much obscured, although the foramen appears 
to be well above the umbonal line. There are rather more 
than twenty acute coste present, whilst the measurements of 
the valve are similar in width and length, viz. 23 mm. The 
shell evidently belongs to the type of R. obsoleta of J. 
Sowerby F from the British Bathonian, as alluded to by 
Dacqué in his Somaliland memoir. The Arabian specimen 
shows also a considerable resemblance to H. Douvillé’s ¢ 
interpretation of AR. edwardsi of Chapuis and Dewalque §, 
from the Shoa limestones of Abyssinia, a shell originally 
described from the French Bathonian, and which the present 
writer thinks is distinct from that depicted by Douvillé’s 
figures, 
Locality. Bachain. 
Rhynchonella ef. subvariabilis, Davidson. 
Rhynchonella subvariabilis, Davidson, Mon. Pal. Soc. 1852, vol. i. 
(British Oolitic Brachiopoda), pp. 80, 81, pl. xv. fig. 7, and pl, xviii. 
fig. 11. 
This form of Brachiopod is represented by a single speci- 
men with closed valves, which from its structural details 
appears to show affinities with Davidson’s R. subvariabilis 
from the British Kimeridgian. Hach valve possesses about 
twelve well-sculptured costee with sharp and elevated summits ; 
the pedicle-valve is depressed in the centre, but projecting 
laterally, while the brachial valve is very convex, although 
abruptly sloping at the sides and exhibiting an elevated 
* Dacqué, Beitr. Pal. Geol. Ost.-Ungarns Orients, 1905, vol. xvii. 
pp. 127, 128, pl. xiv. fig. 11. 
+ Sowerby, Min. Conchology, 1815, vol. i. pl. Ixxxiii. figs. 7, 8, p. 192. 
t Douvillé (H.), Bull. Soc. Géol. France, 1886, sér. 3, vol. xiv. p. 236, 
1, xi. fig, 5. 
r § Chapuis and Dewalque, Mém. Cour. Acad. R. Belgique, 1853, 
vol, xxv. pl. xxxvii. fig. 9, p. 255. 
