154 Geological Society. 



Johnstoni beds, and (8) Avicula-bed ; in Gotham quarry are seen 

 (9) Rubble-bed containing Ammonites planorbis, Lima gigantea, and 

 L. Dunravenensis ; (10) Ammonites -tortilis bed, (11) Sutton-beds, 

 (12) Pholidophorus-bed, (13) Ammonites- Johnstoni beds, (14) 

 "White Lias, and (15) Gotham marble resting upon the Keuper 

 marls, the Avicula-contorta beds being- absent. Mr. Stoddart con- 

 sidered that the Cotham section afforded very decided evidence of 

 the Bridgend series being above the Rhsetic beds, and in the Pla- 

 norbis -zone. He also described a horizontal section of the deposits 

 between Ashley Down and Gotham, and remarked on the physical 

 conditions which had combined to produce the phenomena observed 

 in the district. 



2. " On the Lower Lias beds occurring at Gotham, Bedminster, 

 and Keynsham, near Bristol." By C. O. Groom- Napier, Esq., 

 F.G.S. 



The author described in detail sections exposed in two quarries 

 at Cotham, and noticed others seen at Bedminster and Keynsham, 

 He had made an extensive collection of fossils from the several beds, 

 and he now exhibited a table showing the names and ranges of the 

 several species. The conclusions at which he had arrived were : — 

 that the Sutton-stone is a Liassic rather than a Rhse-tic bed, and 

 belongs to the Planorbis-zone ; and that the Planorbis-zone and the 

 Sutton series are subdivisions of the White Lias. Mr. Groom - 

 Napier also described two new species from the Plauorbis-zone of 

 Cotham (namely, Avicula Sandersi and Anatina Cothamiensis) , and 

 one (Hinnites minutus) found in a stratum at Cotham associated 

 with Monotis decussata. 



3. " On the Dentition of Rhinoceros Etruscus," Talc. By W. 

 Boyd Dawkins, Esq., M.A., F.R.S. 



. The number of teeth possessed by R. Etruscus is the same as 

 that of the three species already described by the author. 



The first premolar, if present at all, disappeared very early in 

 life, leaving no trace of its existence. This character separates it 

 from all other known Miocene species. Of the milk-molars the 

 author has not yet sufficient material to attempt a description. 



The upper true molars differ from those of other British species in 

 the lowness of their crowns, the abruptly tapering form of the 

 colles, and the stoutness of the guard on the anterior aspect. The 

 grinding-surface of the crown is deeply excavated, not worn flat as 

 in R. tichorhinus. The horizontally of the guard, and the height 

 above the cingulum, characterize the whole of the premolars, and 

 distinguish this species from all others found in Britain. 



The lower true molars differ from those of R. megarhinus in 

 being smaller, having the crowns lower, and the guard more strongly 

 marked. They differ from those of R. leptorhinus and tichorhinus 

 in the position of the guard, the lowness of the crown, the thickness 

 of the enamel, and the absence of costas from the rounded anterior 

 area. 



R. Etruscus, together with all Miocene species (except those of 

 the Sivalik Hills), belong to the brachydont section, while all the 



