Geological Society. 331 



than from the base of the caudal. Pectorals | length of 

 head. Ventrals inserted below posterior tliird of anal. Base 

 of anal ^ that of dorsal. Caudal forked, scaly. Caudal 

 peduncle twice as long as deep. Lateral line straight, along 

 72 scales, separated from the dorsal by 8 rows of scales. 



Total length 290 millim. 



The name chosen for this genus is intended to express the 

 important fact that it completely bridges over the gap believed 

 to exist at the present day between tlie two groups usually 

 designated as Salmoninae and Coregoninae. Whilst agreeing 

 with the former in the large mouth with long and narrow 

 maxillary, the strong and complete dentition, and the man- 

 dibular articulation behind the vertical of the orbit, it con- 

 forms to the second as regards the other characters, and 

 approaches the genus Thymallus in particular — so much so, 

 that I have even for a moment entertained doubts as to the 

 fish here described being distinct from Kessler's Thymallus 

 hrevirostris, from the same district, and which is also stated 

 to differ from the typical Thymallus in the longer maxillary 

 bone, nearly reaching to below the posterior border of the 

 eye. However, nothing is said of the dentition of this 

 T. brevi7-ostrisj an omission which, on the part of so able an 

 ichtliyologist as the late Dr. Kessler, implies practical identity 

 with the species to which it is compared, and the shape of the 

 snout and the number of anal rays (11-12) also point to 

 specific difference. It is, however, probable that an examina- 

 tion of T. hrevirostris would show a certain approximation to 

 the fish here described, and supply a farther link in the chain 

 connecting the extreme types of Salmonoids. 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



November 3rd, 1897.— Dr. Henry Hicks, E.R.S., 

 President, in the Chair. 



Mr. W. W. Watts proceeded to give details of some interesting 

 geological features recently exposed at the new Sewerage Works at 

 Carshalton, Surrey, now being made by the Urban District Council, 

 to which the attention of the Society had been directed by the 

 Surveyor during the autumn recess. 



These excavations are situated at a spot which on the Geological 

 Survey map is coloured as London Clay ; and the features of the 

 ground fully justified this colouring. The excavations, however, 

 have shown that there are loamy and sandy beds of a light yellow 



