CEPHALOPODA. 17 



Remarks. — Macrocephalites lamellosus is easily recognised by the character of 

 the ribs ; while all the former species, eyen Macrocephalites polyphemus, pos- 

 sessed rather fine rounded ribs, this species exhibits thick and sharp ribs, which 

 are very prominent on the siphonal side. 



Professor Waagen compares this form with Maoroeephalites grantanum, Oppel, 

 a form which is readily distiDguished by its still coarser and sharper ribs. 



The original figure of this species has also been considerably restored, parti- 

 cularly fig. 15, in which the right-hand upper portion has been added. As regards 

 fig. la, the ribs are by no means so well preserved in the original as might appear 

 from the figure, I further think that their strength has been somewhat exagger- 

 ated in the drawing, which represents them as being much thicker than the inter- 

 stices, while in the original the ribs are much thinner, ribs and interstices being 

 of nearly the same strength. 



Macrocephalites geantanttm, Oppel, sp. PI. IX, fig. 3-3 a. 



1875. Stephanoceras grantamtm, Waagen, FalsBOutologia Indica, Jurassic Fauna of Kutoh, Vol. I, p. 123, 

 PI. XXXVI, fig. 6«, h. 



Among the specimens from Baluchistan several belong to a form with very 

 low depressed whorls of which the height is about double the breadth, and a very 

 narrow, apparently deep umbilicus. They are covered with very regular, sharp 

 ribs which begin near the umbilical ed^e, and after having divided generally into 

 two, sometimes three, branches, pass straight over the siphonal side. Owing to the 

 bad state of preservation no further details could be observed. 



Locality and stratigraphical position, — Mazar Drik ; Folyphemus-\im.e%touQ. 



Memarks. — ^The specimens which have been examined are with one exception 

 all deformed by pressure. The only one in which the shape is preserved, is however 

 so much weathered, that with the exception of a small portion of the siphonal side, 

 not much can be seen. I have, however, compared these specimens with Professor 

 Waagen's original, and I am convinced that they agree so well with that form, that 

 notwithstanding their imperfect state of preservation, they can be identified with 

 Stephanoceras grantanum, Oppel, sp. Professor Waagen has so clearly stated the 

 difference of this species from other forms more or less related to it, that it is un- 

 necessary for me to repeat them here. 



Maceocbphalites 0PI8, Sowerby, sp, PI. VII., fig. 2-2 a. 



1875. Stephanoceras opii, Waagen, Palseontologia Indica, Jurassic Fauna of Kuteh, Vol. I, p. 140, PL 

 XXXVI. fig. la, I, 2, 3. 



A considerably deformed specimen of Macrocephalites can with all probability 

 be referred to the above species. The shell consists of high whorls, laterally much 

 compressed, which overlap each other to such an extent that only a very narrow 



