480 Geological Society. 



the whole of life, the author announces the dental formulae of the 

 four Proboscidian genera of Pachyderma to be 



O A O Q 



Elephas,Inc. ■*-, can. -r-, mol. g _ H , = 34. 



** 2 ,6-6 n , 



Mastodon, Inc. -tt, can. -rr, mol. fi _ fi ? = 26. 



Tetracaulodon,Inc.-^-, can. -rr, mol. fi _ fi , = 28. 



q q 5 5 



Deinotherium, Inc. — , can. -^r-, mol. -= r» = 22. 



For the determination of the dental formulae of Mastodon and Te- 

 tracaulodon, Dr. Grant relied entirely on the splendid collection of 

 jaws, crania, and teeth in Mr. Koch's possession, which afford ample 

 means for the solution of that problem. For the dental formula of 

 Deinotherium he has been indebted solely to the casts and fragments 

 of that genus in the British Museum. After explaining the uncer- 

 tainties and fallacies to which naturalists have been exposed in the 

 identification of species, from not having ascertained the entire dental 

 series in any Mastodon, the sixth section of the memoir describes the 

 distinctive characters and the distribution of the Mastodon angusti- 

 dens, M. latidens, M. Elephantoides, M. minutum, M. Tapiroides, M. 

 Andium, M. Borsoni, M. Humboldtii, M. Turicense, M. Avernense, 

 M. giganteum, M. Cuvieri, and M. Jeffersoni. The seventh section 

 of the memoir is devoted to the examination and description of the 

 generic characters of Tetracaulodon, as established by Dr. Godman, 

 and as founded on the number and form of the teeth, the peculiarities 

 of their microscopic structure, the form of the jaws, the tusks, the 

 alveoli of the tusks, the intermaxillary fossa, the infra-orbitary fora- 

 mina, and other influential characters. The eighth and last section 

 of this paper is occupied with an account of the distinctive characters 

 and the distribution of the known species of this genus j viz. Tetra- 

 caulodon Godmaniy T. Collinsii, T. Tapiroides, T. Kochii, T. Haysii, 

 and T. Bucklandi. 



June 29. — " Notice on the Discovery of Insects in the Wealden of 

 the Vale of Aylesbury, Bucks, with some observations on the distri- 

 bution of these and other Fossils in the Vale of Wardour, Wiltshire." 

 By the Rev. P. B. Brodie, F.G.S. 



In a former notice Mr. Brodie announced the discovery of insects 

 as well as a new genus of Isopods in the Wealden beds of the Vale 

 of Wardour, and in this communication he gives an account of ad- 

 ditional localities in the same Vale, where he has found both the in- 

 sects and crustaceans, and of the strata belonging to the Wealden se- 

 ries, in which he has obtained fossil insects, in the Vale of Aylesbury. 



Vale of Wardour. — The precise spot noticed in the former paper is 

 a quarry at Dallards, and the first point to which the author now calls 

 attention, is situated about two miles to the south-east of it. The fol- 

 lowing section is given of the beds at the new locality, the dip being 

 slightly to the south : — . 



