492 G. C. Crick — Cephalopoih from N.W. Indian Frontier. 



neiglibourliood of the limestone at the locality marked h in the 

 section reproduced herewith. Its greatest length is -14 mm. ; it is 

 depressed, subtrapezoidal in cross-section, and has its greatest width 

 near the margin of the periphery ; its dorso-ventral diameter (or 

 height of tlie whorl) is 24-5 mm., its greatest width being 34mm. 

 including the ribs, or 32 mm. excluding the ribs. Although con- 

 siderably eroded the specimen appears to be not quite symmetrical, 

 one margin of the periphery being much more angular than the 

 other ; consequently on one side the most prominent part of the 

 whorl appears to be close to the peripheral margin, whilst on the 

 other the most prominent part is at about one-third of the height of 

 the whorl from the periphery. 



The shell was almost entirely evolnte, and was scarcely impressed 

 by the preceding whorl ; the sides of the whorl are convex, sloping 



Fig. 1 .— Belemnite from Mesozoic rocks (Xeocomian ?) between Miram Shall and 

 Idak, Tochi Eiver District, N.W. India. The fissure traversius; the 

 specimen longitudinally is of the nature of a crack and not a groove. 

 Drawn from the specimen [register number C. 9296] in the British Museum 

 (Natural History) . 



Fig. 2. — Ammonoid {Crioceras ?) from Mesozoic rocks (Xeocomian ?) between 

 Miram Shah and Idak, Tochi River District, N.W. India, a, peripheral 

 or ventral aspect ; b, lateral aspect ; c, dorsal aspect ; d, transverse section 

 showing as3'mmetry of the whorl. Drawn from the specimen [register 

 number C. 9297] in the British Museum (Natm-al Historj'). 



gradually from near the margin of the periphery into the umbilicus, 

 the umbilical margin being imperfectly defined. The fragment 

 bears six rather coarse prominent ribs, each about 2 mm. wide, 

 separated by interspaces of about twice their own width. The ribs 

 rise at the inner third of the lateral ai'ea, extend rather obliquely 

 forward to the margin of the broad periphery, which the^' traverse 

 in a straight course without interruption or bifurcation, or apparently 

 without any flattening. The base of the body-chamber is preserved, 

 and, though imperfect, gives the general form of the septal surface 

 and of the suture-line. The septal surface is a little asymmetrical; 

 when the surface is viewed posteriorly the siphonal lobe is seen to 

 be a little to the left of the median line. 



