332 Correspondence — R. M. Deelcy. 



In the lower jaw, owing to the difficulty of interpreting the 

 conditions, it was not certain whether there were representatives of 

 five or six teeth in front of the premolars. Presuming there were 

 five, the large functional incisor of the adult was the fourth of the 

 series. As in the upper jaw, there were four premolars and one 

 molar, the second premolar not fully developing. There were 

 evidences of vestigial predecessors to the large lower incisor and 

 to pm. 4. 



The following points of histological interest were noted : — 



(1) The heaping up of the epithelium along the alveolar margins, 



a character often supposed to be peculiar to the Ungulates. 



(2) The precocious development of the enamel. 



(3) The compactness of the stellate reticulum of the enamel-organ. 



(4) The abundant evidence of blood-vessels within the enamel-organ, 



thus confirming the observations of Poulton and Howes in the 

 Rodents. The opposite opinion is usually held. 



(5) Some slight evidence in support of the fusion of enamel-organs. 



Such fusion has been recorded in the fishes and reptiles, but 

 not hitherto in mammals. 



2. Professor J. P. Hill, D.Sc, communicated a paper by Dr. P. Broom, 

 C.M.Z.S., " On the Structure of the Skull in Cynodont Eeptiles." 

 The author, after a study of all the available material contained in 

 the British and South African Museums, gave a detailed comparative 

 account, illustrated by a series of figures, of the morphology of the 

 skull in the chief genera of the Cynodontia, including Banria, 

 Nythosaurus, Cynognathus, Trirachodon, Gomphoynathus, Biademodon, 

 Sesamodon, and Melinodon. He also discussed in some detail certain 

 peculiarities of the Mammalian skull, apparently derived from 

 a Cynodont ancestor. 



3. Dr. C. W. Andrews, F.B.S., F.Z.S., read a paper "On a New 

 Species of Binothermm from British East Africa". The specimens 

 described were sent to the British Museum by Mr. C. "W. Hobley, 

 Commissioner of Mines for British East Africa. They included 

 portions of the mandible with teeth, a calcaneum, and a patella of 

 a small species of Binotherium nearly allied to B. cuvieri, from the 

 Lower and perhaps Middle Miocene beds of France. The new species, 

 which he proposed to call Dinotherium hobley i, differed from B. cuvieri 

 in several particulars — e.g., the inner anterior column of pm. 3 was 

 more distinctly developed, and the talon of m 3 had a distinct tubercle 

 on its inner side. Remains of Phinoceros, a giant Tortoise, Trionyx, 

 and Crocodiles also occurred. The bones were well preserved in 

 a tough clay, and further collecting would no doubt yield important 

 results. 



GOEEESPOnSTDEnSTCE. 



LAND-ICE HYPOTHESIS. 

 Snt, — In the May number of the Geological Magazine, p. 238, the 

 Rev. Osmond Fisher calls attention to the evidence he has seen of 

 disturbances in the rocks below boulder-clays, and suggests that the 



