140 Reports and Proceedings. 



(5) Ammonites-taurus bed, (6) Echinoderm-beds, (7) Ammonites-John- 

 stoni beds, and (8) Avicula-bed; in Gotham quarry are seen (9) 

 Rubble-bed, containing Ammonites planorbis, Lima gigantea, and Z. 

 Dunravenensis, (10) Ammonites-tortilis bed, (11) Sutton-beds, (12) 

 Pholidophorus bed, (13) Ammonites-Johmtoni beds, (14:) White Lias, 

 and (15) Gotham marble resting upon the Keuper marls, the Avic- 

 ula-contorta beds being absent. Mr. Stoddart considered that the 

 Gotham section afforded very decided evidence of the Bridgend 

 series being above the Rhaetic beds, and in the Planorbis-zone. He 

 also described an 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 G. 0. Groom-Napier, Esq., F.G-.S. 



The author described in detail sections exposed in two quarries at 

 Gotham, 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 Rhaetic 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 Planorbis-zone of Gotham, 

 namely, Avicula Sandersi and Anatina Cothamiensis ; and one — 

 Hinnites minutus — found in a stratum at Gotham associated with 

 Monotis decussata. 



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

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



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

 of the 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 materials 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 

 coUes, d and e, and the stoutness of the guard o on the anterior 

 aspect. The grinding surface of the crown is deeply excavated, not 

 worn flat as in B. tichorhinus. The horizontality of the guard o, and 

 the height above the cingulum, characterize the whole of the pre- 

 molars, and distinguish this species from all others found in Britain. 



The lower true molars differ from those of B. ynegarhinus in being 

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

 marked. They differ from those of B. leptorhmus and tichorhinus in 

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

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

 area. 



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

 Sewalik Hills), belong to the brachydont section, while all the living 

 Pliocene and Pleistocene species (except Etruscus) belong to the hypo- 



