SCIENTIFIC SOCIETIES* 37 



restricting its wanderings to the thickness of the shell. The mollusc had 

 retaliated by depositing fresh layers on the intruder, and the struggle had 

 gone on until the chambers were several times the normal thickness of the 

 shell, and were roofed over by a thin curved layer of secondary shell- 

 substance, while the points at which branches had been pushed further in 

 were represented by thick conical papillae. 



December 4. — Prof. Stewart, President, in the chair. 



Mr. John Watson was admitted a Fellow of the Society ; and the 

 following were elected : — Messrs. A. Barclay, W. Brown, W. A. Clarke, 

 W. Gill, C. M'Kae, W. H. Miskin, E. Bentley, H. Williams, and H. G. 

 Plummer. 



The President exhibited some eggs of the Shell-slug, Testacella halio- 

 tidea, and briefly described the habits and mode of feeding in this mollusk. 

 He also delineated and described the feeding tract of the snail. 



Mr. F. G. George exhibited an autumnal flowering form of Mercurialis 

 perennis, with stems four feet in length, which he had found at Preston, 

 Lancashire. 



Mr. R. A. Rolfe exhibited and made some remarks on a coloured 

 drawing of Cycnoches rossianum, showing both male and female in- 

 florescences on the same pseudo-bulb. 



Mr. J. E. Harting exhibited an immature example of Bonaparte's Gull, 

 Larus Philadelphia, Ord., of North America, which had been shot on the 

 Cornish coast at Newlyn, on the 24th October last. 



Mr. T. Christy exhibited and made remarks on some Coca-leaves which 

 had been forwarded from an East Indian plantation, and which were found 

 to be superior to any received from South America. 



On behalf of Mr. H. N. Ridley, of the Botanic Gardens at Singapore, 

 Mr. B. D. Jackson read a paper on Orchids, genus Bromheadia, on which 

 some critical remarks were offered by Mr. R. A. Rolfe. 



The next paper was one by Messrs. J. H. Lace and W. B. Hemsley, on 

 the Vegetation of British Beluchistan, illustrated by a route-map showing 

 the district in which Mr. Lace had been collecting. Seven hundred 

 species were catalogued, amongst which were eleven new to science. The 

 paper was ably criticised by Mr. C. B. Clarke, and Mr. J. G. Baker made 

 some interesting observations on the peculiar prickly character of the 

 vegetation which predominates in the hot and dry district explored. 



Zoological Society of London. 



Nov. 18, 1890.— Dr. Mivaet, F.R.S., in the chair. 

 Mr. F. Mentieth Ogilvie exhibited and made remarks on a specimen of 

 the Red-headed Flycatcher obtained in Norfolk. 



