CEPHALOPODA. 7 



of more than five low, flat whorls, which increase very slowly in height and are 

 separated by a deep suture. The base is flat, the umbilicus narrow. 



Locality and stratigrapUcal position. — Mazdr Drik, Polyphemm-\\mB&ioue, 

 Remarks. — In the absence of any distinguishing features I refrain from any 

 references to species hitherto known. 



3. Class: CEPHALOPODA, 

 1. Sub-class: NAUTILOIDEA. 



Eamily: NAVTILIB^. 

 Genus: NAUTILUS, Breyn. 

 Nautilus wandaensis, Waagen. Plate II, fig. 1-la. 



1875. Nautilus wandaensis, Waagen, Palseontologia Indica, Jurassic Fanna of Kutoh, Vol. I, p. 17. 



Dimensions. L II. 



Diameter of shell , . 135 100 



„ of umbilictis ......... 14 12 



Height of the last whorf from the umbilical suture .... 77 54 



„ „ „ from the preceding whorl .... 54 45 



Thickness of last whorl 77 F 



Tiyhorls rather low, but broad ; general shape very involute with very narrow 

 umbilicus. The whorls ai?e thickest near the umbilical margin, and have flat sides 

 which slope very gradually towards the ventral side ; the latter is flattened, with 

 obtuse edges. The septa are simply curved and cut out on the ventral side. The 

 siphunole is eccentric and nearer the ventral side. 



Locality and stratigrapMcal position. — Mazdr Drik, Polyphemus-limestone. 



Bemdrks. — In general shape this species closely resembles Nautilus giganteus, 

 d'Orb., but it can be easily distinguished from this species by its smaller umbili- 

 cus ; the position of the siphuncle forms also a distinguishing feature, as in Nautilus 

 giganteus it is closer to the dorsal, whereas in Nautilus wandaensis it is nearer to the 

 ventral side. 



Professor Waagen founded this species on two specimens, of which only one, 

 however, the original of pi. IV, fig. 3a, 6, can be traced in the collection of the Geo- 

 logical Survey Department. The sutural lines are not visible on this specimen, 

 the drawing of which is considerably restored ; the whole of the upper part of the 

 right side of fig. 3, b, is restored, so that the cross section is therefore by no means 

 so clearly seen as one might be led to believe from the figure. 



The specimens from Baluchistan, although considerably larger than one of 

 Professor Waagen's type specimens, agree so well with that form that I have no 

 doubt that they are identical. They are alike not only in general shapej but also 



