Jurassic MoUusca from Arabia, 19 



;e ribs, showing a definite bifurcation on the lateral 

 into two equally coarse ribs which pass without inter- 

 on over the peripheral area. Unfortunately the specimen 



imperfect that it does not exhibit the whole height of 

 vjiorl, and it is so crushed that it does not show the 

 nal shape of the transverse section of the whorl. The 

 ments appear to be relatively coarser than those of the 

 r examples of Perisphinctes in the collection ; the cha- 

 3r of the bifurcation of the ribs is also slightly different, 

 3 being in this fragment a slight thickening al the point 

 furcation. The ribbing, in fact, agrees very closely with 

 of the earliest portion of the outer whorl of Sowerby's 

 specimen of Perisphinctes poUiageri, with which we have 

 pared it. Sowerby^s type specimen came from the 

 '-sert N.E. of Outch/' According to Waagen, this 

 ies and the closely allied but more coarsely ornamented 



Perisphinctes katrolensis * are in Cutch very common 

 e coarse iron-sandstone of the Katrol range that corro- 

 ds to about the middle of the Katrol Group. Dr. Waagen 

 ided the Cephalopoda of this group as corresponding to 

 : of the Kimeridgian and Upper Oxfordian beds of 

 )pe. The group is divided into two parts, of which 

 (apparent regards the Lower as of Sequaniau and the 

 er as of Kimeridgian age f. 



)c. Valleys between the villages of Al-Kura and Samma, 

 t 15 miles N.E. of Dihala. 



Genus Oppelia, Waagen. 



OppeUa'>&^, (PL III. fig. 4.) 



le flattened remains of a smooth minutely umbilicated 

 about 39 mm. in diameter are probably referable to the 

 s Oppelia, but the fossil is too imperfect to be specifically 

 mined. 



>c. Valleys between the villages of Al-Kura and Samma, 

 t 15 miles N.E. of Dihala. 



C. Belemnoi DE A. 



Genus Belemnites, Lister. 



Belemnites of. hastatus, H. D. de Blainville. 

 (PI. II. figs. la,b,c.) 



1 . Belemnites hastatus, II, D. de Blainville, M6m. sur Ies B6lemn. 

 . 71, pi. i. fig. 4, pl. ii, fig. 4, pl. V. fig. 3. 



V. Waapen, o;;. cit. p. 4, 1875, p. 184, pl. liii. 



L. de Lapparent, ' Trait6 de Geologie/ 5th ed. 1906, vol. ii. pp. 1243 



5. 



o* 



