1855.] BAIL\ — SOUTH AFRICAN FOSSILS. 455 



1. Cristati, D'Orbigny ; a group of which all the species are cre- 



taceous. To this section Ammonites Soutonii and A. Stangei-i 

 may be referred. 



2. Clypeiformes, D'Orbigny ; lower cretaceous and oolitic. Am- 



monites Uinbulazi appears to belong to this group. 



3. LcBvigati, a section established by Prof. Forbes for a Pondi- 



cherry cretaceous form, and in which Ainmonites Gardeni 

 may now be included. 



Number of specimens of each species in this collection : — 

 Ammonites Soutonii .... 2 Ammonites Gardeni .... 3 

 „ Stangeri .... 4 „ Umbulazi .... 2 



Cristati. 



1. Ammonites Soutonii, nov. sp. PI. XI. fig. 1. 



A. testa discoidea carinata ; anfractibus 5 ; costis numerosis flexuosis, 

 internis acute tuberculatis ; dorso utrinque tuberculato, medio 

 carinato ; umbilico mediocri ; apertura ovato-elliptica. 



Diameter, 1 foot 5^ inches. 



Diameter of disk formed by the inner whorls, 7 inches. 



Length of aperture, 6 inches. 



Breadth of aperture, A\ inches. 



Shell discoidal ; whorls 5, with numerous flexuous ribs, each of 

 which bears a small tubercle on the edge of the umbilicus, and two 

 broader ones at its termination on the back ; umbilicus small ; inner 

 whorls partly concealed, flattened, with prominent tubercles upon 

 the centre of the numerous ribs ; back somewhat round, with a 

 distinct keel, and a row of lengthened tubercles on each side. Aper- 

 ture ovate and elliptical. 



This very large and magnificent Ammonite, which is in fine pre- 

 servation, with portions of the shell a quarter of an inch in thickness 

 still attached, is somewhat distantly related to Ammonites 7'ostratus 

 and A. varians from the Lower Chalk. 



It is dedicated to the memory of the late private Thomas Souton, 

 of the Grenadier Company, 45th Regiment, who, whilst acting as 

 Capt. Garden's servant, zealously extracted it, after much perse- 

 verance and labour, from a very hard stratum high up the cliff. 



Locality. — Cliffs of the coast of S. Africa, near the Umtafuna 

 and Umzambani Rivers. 



2. Ammonites Stangeri, nov. sp. PI. XI. fig. 2. 



A. testa discoidea, carinatA, ; anfractibus 6, angustatis ; costis nume- 

 rosis tuberculatis, internis bifurcatis ; dorso utrinque tuberculato, 

 medio carinato ; apertura ovato-elliptica. 



Diameter,' 1 foot. 



Diameter of disk formed by inner whorls, 8 inches. 



Length of aperture, 3^ inches. 



Breadth of aperture, 2^^ inches. 



