70 
JURASSIC, OK 
BELEMNITES SULCATUS- —Miller. 
Plate 10. 
-Belemnites sulcatus, Miller, Trans. Geol. Soc., 2nd Ser., vol- ii., pi. 8, f. 3. 
„ canaliculatus, Schloth. 
„ „ Sow., Trans. Geol. Soc; 
„ sulcatus Blanford, Spiti fossils, Journ. As. Soc. Beng. 
The guards of this species, of which the collection contains 
a large number of various sizes, are identical with those from 
the Spiti Valley and Cutch. The sulcation is broader and 
deeper than in European specimens, and is continued to the 
apex. With slight variations, the Indian specimens are 
generally less depressed than those figured by M. D'Orbigny 
(Pal. Francaise), Zieten, &c., the antero-posterior diameter 
being nearly equal to the transverse diameter. The largest spe¬ 
cimen in Colonel Stracliey's collection measures as follows :— 
Length .3*6 in. 
Antero-posterior diameter ... ... .. ... 09 „ 
Transverse . ... ... 0*9 „ 
Some specimens of phragmocones found with the above, 
probably belong to the same sjjecies. Some of them are 
figured PI. 10, figs. 0, 7. 
AMMONITES ALATU S—Strackey, MSS. 
Plate 18, figs. 3 a , b. 
A. testa convoluta, discoidea, striata, lamellosa; anfractibus 
rotundatis, depressis, haud celatis, lente accrescentibus, transversim 
striatis, intervallxxn lamellatis: lamellis rectis, ad basin undulatis, 
apud umbilicum antrorsum curvatis. Apertura transverse elliptica. 
Diameter of fragmentary whorl 1*2 in. Spiral ratio ... . 2:1 
Thickness ... ... ... 1*4 „ Immersion of whorls ... 
Thickness: diameter ... x 
6 - 
This is an Ammonite of the “ Fimbriatigroup, haviim 
rounded depressed whorls, increasing slowly in size, and scarce¬ 
ly overlapping. The whorls are transversely striated, and bear 
at short distances thin prominent lamellae, frilled at their base 
X 
