1862.] DE KONINCK INDIAN FOSSILS. 15 



in no way resemble those of Carboniferous Ooniatites, which are 

 almost always angular. 



The specimen figured is but 4 centimetres in diameter; the height of 

 the last spiral whorl is 16 millimetres, and the width 8 millimetres ; 

 the diameter of the umbilicus is 15 millimetres. 



37. Nautilus Burtini, Galeotti. PI. VIII. fig. 3. (Mem. couronnes 

 de l'Acad. de Bruxelles, t. xii. pi. 4. fig. 4. p. 140.) 



After comparing this Nautilus with some specimens of the species 

 described by Galeotti, derived from the Eocene sands of the neigh- 

 bourhood of Brussels, I have not been able to find any distinguishing 

 character between them. It is therefore probable that the specimen 

 figured in this memoir has not been derived from the Carboniferous 

 system, but from some Nummulitic bed which occurs in the Punjaub. 

 This is also Dr. Fleming's opinion, who did not find it in situ, but on 

 a heap of carboniferous stones destined for road-repairs *. 



38. Nautilus Flemltstgianus, De Kon. PI. VIII. fig. 2. 



This species is remarkable on account of the lateral tubercles with 

 which the last whorl of its spire is furnished. If I may judge from 

 the dimensions of the single fragment which I have been able to 

 examine, its size must have been considerable. At first sight it 

 presents some resemblance to the N. tuberculatus, Sow., but is easily 

 distinguishable by the shape of its tubercles and by the distance of 

 its chambers. In iV. Flemingianus these tubercles are much elon- 

 gated, and placed on alternate chambers, while in the species de- 

 scribed by Sowerby the tubercles are more rounded at their base, 

 forming a kind of crown round the umbilicus ; they are besides more 

 prominent, and present nothing regular in their distribution with 

 reference to the chambers. They are very perceptible on the first 

 whorls of the spire of the latter, but are there scarcely apparent in 

 N. Flemingianus. The chambers of this species have their lateral and 

 dorsal margins feebly sinuous, and the fragment figured shows four 

 coils of the spire. By completing the last whorl, one is able to prove 

 that it must have been composed of about forty chambers, and that 

 its greatest diameter was about 19 centimetres ; viewed in front, the 

 last visible chamber presented an elevation of 6 centimetres, whilst 

 that of the one behind it was not more than 3 centimetres in 

 height ; their width is a little greater ; their shape in the same 

 position is that of an oval, irregularly compressed on the two oppo- 

 site sides (see PI. VIII. fig. 2 a). The siphuncle is scarcely visible, 

 but appears to be rather large, and is situated towards the upper 

 third of the height. The coils of the spire do not overlap one 

 another. From the Productus -limestone of Vurcha. 



39. Oethoceras vesiculosum, De Kon. 



This species is very remarkable on account of the calcareous 



* The following note was found attached to the specimen : — 

 " This fossil was found among the debris of Carboniferous Limestone. It pro- 

 bably, however, has weathered out of Numinulitic limestone." 



