644 EEPOET — 1891. 



granites trawled in the English Channel. There is thus no recognised source of 

 pre-Deyonian tourmaline in the neighbourhood of South Devon, yet the source of 

 derivation of the rocks under discussion could not seemingly he remote, or the 

 tourmaline, quartz, and mica could scarcely have kept together. The tourmaUne 

 granites of Cornwall would meet the case, if any of these are of pre-Devonian age ; 

 but on this point the author has no information. 



Besides the tourmaline observed in the rocks at Street Gate and Start Point, 

 the author has noticed the same mineral, occurring in the same way, in a sandstone 

 from near Tinsey Head in Start Bay, and in a sandstone from near Charleton, on 

 the Kingsbridge estuary, both of Devonian age. 



SATURDAY, AUGUST 22. 



The following Reports and Papers were read : — 



1. Beport of the Committee on the Circulation of Underground Waters. 

 See Eeports, p. 300. 



2. Note on the Discovery of Estheria Minuta {var. Brodieana) in the New 

 lied Sandstone. Ihj C. E. De Range, F.G.S., of H.M. Geological 

 Survey. 



This minute crustacean was first discovered by the Rev. P. B. Brodie, F.G.S., 

 in the Rhretic, at Wainlode Cliff, Gloucestershire,' and was named after him by 

 Professor Rupert Joucb. It was afterwards found in a band of fine sandstone 

 occurring in the Keuper marls, at several localities in the Midland counties. Still 

 later it was discovered in tlie Letten Kohl of the Baden Trias, which is the lowest 

 horizon of the German Keuper. 



In September of last year I discovered a small assemblage of these shells in 

 the lowest member of the Cheshire Keuper, viz. the Lower Keuper building 

 stones ; they occurred in a pebble of marl, of a deep purple colour, enclosed in a 

 pale yellow sandstone, at Broadhurst's quarry, Alderley Edge. The majority of the 

 specimens are now in the British and Jermy'n Street Museums, and they have been 

 described by our President, Professor Rupert Jones, in the ' Geological Magazine.' 

 I have failed to find any more, after the most careful search. 



It is worthy of note that the oldest-known mammal, Microlestes Moorp.i, Owen, 

 occurs in the German Letten Kohl ; but in England, where it was discovered by 

 Mr. Charles Moore in 1858, it is not known below the Rhajtic. The small mammal, 

 and the minute crustacean, occurring both above and below the Keuper marls, 

 may it not be hoped that the mammal may also be found in England, and support 

 the views of the late Professor Forbes, that the beds now called Rhaetic are really 

 part of the Trias : a view also held by the late Sir Philip Egertou, on the 

 evidence of the fish remains. 



3. Ileport of the Committee on Geological Photographs. 

 See Reports, p. 321. 



4. Notes 7ipon Colobodus, a Genus of Mesozoic Fossil Fishes. 

 By Montagu Browne, F.Z.8., F.G.S. 



Colobodus appears to have been first constituted a genus in the vear 18.37 by 

 Louis Agassiz (see 'Poissons Fossiles,' Tome II., ii^ partie, p. 237), who gave this 

 name to some Lqndofits-Yike teeth {Colobodus hoyardi) from the Muschelkalk, 



