390 Mr. R. Bullen Newton on a Marine 
(N. of Aden) containing fossils which were submitted to 
Stoliczka for determination, his opinion of which was formu- 
lated in the following statement :—“ The limestone is full of 
sections of a long turreted Nerinea, a species of Cryptoplocus ; 
of a Pelecypod, probably a Corbis; and large numbers of 
Spongites, generally dichotomous. ‘The limestone is evidently 
ot Mesozoic age, and the few fossils appear to resemble most 
Upper Jurassic forms, though the same genera occur in 
Lower Cretaceous beds.”” ‘The next account of Arabian 
Jurassic fossils was furnished by the late G. C. Crick and 
the present writer *, from a series of Molluscan remains 
collected by Major H.8. Hazelgrove in the districts of Nobat 
Dakim and Dihala, both being situated to the north of Aden. 
They comprised specimens of the groups Cephalopoda ( Belem- 
nites, Nautilus, Perisphinctes, and Oppelia?) ; Gastropoda 
(Nerinea and Trochus); avd Pelecypoda (Parallelodon and 
Nucula). Our studies of this fauna enabled us to recognize 
affinities with that characterizing the Jurassic rocks of 
Somaliland (the Bihin Limestone), the Himalayas (Niti and 
Spiti), and Western India (Cutch). Mr. Crick was of opinion 
that the Cephalopods indicated a Kimeridgian age, while the 
other Mollusca were considered by myself as originating 
somewhere between the Oxfordian and Kimeridgian, and 
therefore belonging probably to Corallian (or Sequanian) 
times. 
A more recently published paper by Mr. G. H. Tipper + 
contains a notice of some Jurassic fossils from the Aden area 
(Diala or Dihala region), in which he describes very similar 
Mollusca as referred to by G. C. Crick and myself, including 
Belemnites and different torms of Pertsphinctes ; a Gastropod 
of doubtful determination, some Pelecypoda of the genera 
Parallelodon, Pinna, Trigonia, Syncyclonema, and Cardinia? ; 
and remains of Pentacrinus stem-joints. The author re- 
garded this fauna as bearing ‘a distinctly Upper Jurassic 
Facien tt 
Mr. Philby’s fossils were obtained from four localities :— 
(1) Bachain, in the neighbourhood of Sadus (long. 46°, 
lat. 25°), which is some 3200 feet above sea-level, where the 
rocks are fawn-coloured limestones of considerable harduess, 
being more or less siliceous, with occasional associations of 
‘« Beekite,” and sometimes showing oolitic structure. 
* “On some Jurassic Mollusca from Arabia,” Ann. & Mag. Nat. Hist. 
Bee, ser. 8, vol. ui. pp. 1-29, pls. i.-iii. 
+ Tipper, G. H., “Notes on Upper Jurassic Fossils collected by 
Captain Ry Ee Lloyd near Aden,” Records Geol. Surv. India, 1910, 
vol. xxxvill, pp. 836-341, pls. xxxv., Xxxvi. , 
