1870.J GEIESBACH — GEOIOGT OF NATAL. 63 



Description of Species. 

 Genus Ammonites, 



There are four species described iu Mr. Baily's paper, to which I 

 have to add two more, both of which are found in the Cretaceous 

 series in Southern India. 



One of the commonest species in this formation is 



Ammonites tjmbolazi, Baily. PI. III. fig. 1. 



A fi.ne and characteristic form, which is not quite distinctly 

 figured in Mr. Baily's paper. The fiexuous ribs on the well-preserved 

 shell are not so strongly marked as in the figure, and do not show the 

 least tendency to form tubercles near the back, but gradually die 

 away in all the specimens I have seen. ]S"umber of specimens 26. 



Locality. Umtamfuna river, South Africa, from bed d. 



Ammonites kembda, Forbes. PI. III. figs. 2, 3. 



The whorls are higher than wide ; it possesses a remarkably 

 shaped keel. The shell is well preserved. It has distinct furrows, 

 which are about 6 to the whorl, and are sKghtly bent near the keel, 

 towards the mouth. The suture is easily detected ; 6 lobes and 6 

 saddles can be made out. The dorsal saddle is bipartite, the next two 

 lateral saddles bipartite, and the next three only siugle saddles. The 

 dorsal saddle is double the height of the dorsal lobe ; the lateral lobes 

 are very deep ; the lateral saddle is of the same height as the dorsal 

 one ; but the succeeding ones decrease very rapidly in size. Porbes's 

 figure of this Ammonite is very indistinct ; so also is the fragment 

 which is figured in the ' Memoirs of the Geological Survey of India.' 



Ammonites rembda, from Pondicherry, is in every particular like 

 our African specimen. The shell is perfectly smooth, and shows in 

 some places beautiful colours. There are some small specimens 

 amongst the collection, which seem to me to be only young indi- 

 viduals of A. rembda. Number of specimens 3. 



Locality. Cliffs on the sea-shore, between the rivers Umtamfuna 

 and Umzambane, in Kafiirland, from bed d. Pondicherry, in India. 



Age. Probably Cenomanian. India, Valudayur group. 



Ammonites Kayei, Forbes. 



An excellent specimen, with flexuous ribs, and a few furrows 

 parallel to the ribs. The ribs are very fine and narrow, and ge- 

 nerally divided into two or three at about the middle of the whorls. 

 There cannot be the slightest doubt about the identity of the African 

 specimen with Ammonites Kayei, as it shows all the remarkable pecu- 

 liarities of Forbes's original specimen in the Collection of the Society. 



Locality. Umtamfuna river, from bed d. Pondicherry, west of 

 Penangoor, and north of Odium, in the Trichinopoly district. 



Range. Cenomanian. In India, the Valudayur and Ootatoor groups. 



Anisoceeas ktjgatum, Forbes. PI. III. fig. 4. 



My specimen shows sharper ribs than the Indian form ; and as 

 it is only a fragment, it does not allow a very distinct specification. 



Locality. Umtamfuna river. Bed d. 



In India. The Valudayur group. 



