a 78 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXIIi. 



earpieces at the mouth which appear to run straight, not inclined up or 

 down as in Waagen's omphalodes and dhosaensis. There are so many of these 

 specimens fiindable and the differences are so marked that a monograph 

 might well be written on them alone. I rather gather that this sub-genus (or 

 .section) of Pensphinctes has been differentiated off into a new genus since 

 Waagen's day ; but any ammonitist who may read this with any interest 

 will probably know the style of ammonite to which I refer. Some are 

 depressed, some compressed ; ribs number about 15 in the 4th whorl, and 

 are broad and rounded ; some have branch ribs running straight, some 

 curved forwards more or less strongly; some are more involute than others. 

 In these same beds occurred a specimen of what looked like Waagen's 

 0])pelia orientalis. 



The D. O. beds bear much the same appearance as that of the same beds 

 along Fakirwadi, Bharasar and Samatra, but the tilt being slighter." less 

 of the slab surface is exposed and the scarp is not so high. Still here one 

 <30uld notice the fairly frequent occurrence of Ferisph, Rota — too much 

 engrained in the rock for extrication and certain identification. A new 

 Fensphinctes of similar pattern and shape, but of much denser and finer 

 ribbing turned up in good preservation. The mouth piece seems approach- 

 ing the uncoiling stage of decline. The section is not high enough to 

 class it with Waagen's Obliqiceplicatus . Again these beds produce good 

 specimens of Stephanoceras. One looks much like Waagen's illustration 

 of ^tepli. pxjlypliemus, except that its section is not so squarish. In Dr. 

 Noetling's work on the Fauna of Mazar Drik in Beluchistan, we find that 

 the original of Waagen's larger polyphemus has disappeared : and 

 Dr. Noetling hopes that some equivalent of it may turn tip. I daresay 

 "this is an equivalent but its lobes are not visible. Its diameter is 

 237 mm. Another Steplianoceras of flattened globular shape reminds one 

 of tumidum but has quite a different suture. An Aspidoceras with clean 

 double row of tubercles on high ribs reminds one of Babeanum or Athleta. 

 Its shape is more like Babeanum : its suture more like Athleta : but the 

 inner whorls are blocked. The discovery of an Oppelia from the D. O. 

 beds close to the polyphemus (?) was of much interest. Oppeliee of the 

 Trachynota group abound in Katrol beds close above D. O. : butD. O. is very 

 reticent about their ancestors. Hence the interest : however the specimen 

 was very fragile and broke up too easily : the fragments show (or seem to 

 show) a clear inner half of the whorl : outer half with regular evenly-sized 

 low i-ounded ribs ending in tubercles on the siphonal edge. 



But the Katrol beds are the distinctive feature here. 150 yards South- 

 East of the tank you will strike a shallow nullah running West along the 

 Katrol lines. It is a marvel of wealth. Every step you take you '11 see the 

 outer casts or fragments or protruding edges of some of Waagen's sub-genus of 

 Perisph. evoluti. From reading Dr. Uhlig's book on the Spiti shales I conclude 

 that classfication has somewhat changed since Waagen wrote : but here is an 

 excellent field for studying the Cutch varieties of the Virgatosphinct and 

 Aulacosphinct sub-genera. Most specimens picked up seem to belong to 

 Waagen's bathyplocus and torquatus types. I see that it is now recognized 

 that Waagen's torquatus is not the same as Sowerby's ; but as no new name 

 has yet (it seems) been given to Waagen's, I must still call it by that name. 

 However the specimens are so numerous and the divergences so minute 

 that I cannot feel sure of having certified any : nor can one certify any 

 without comparison with the type. Waagen was not able to give the 

 sutures of any of those four similar sorts, bathyplocus, torquatus, katro- 

 lensis and pottinyeri. The hard brown rock of which these Ler specimens is 

 composed shows up the suture of many quite clearly. The lines are 

 very similar to those of Uhlig"s Vivgato sphinctes, the auxiliaries forming a 



