680 REPORT — 1891. 



On returning to Tonga I had the opportunity of visiting Falcon Island, -which 

 was thrown up hy volcanic eruption in 1885, and some of the other less accessible 

 islands of the group. 



After the departure of the Egeria in November, I paid two visits to the Vavau 

 Islands in the northern part of the Tonga group, and owing to the courtesy of 

 Mr. S. Parker of Eua I stayed two weeks with him on that island. 



I finally left Tonga on April 24, 1890, and returned to England at the end of 

 the following September. My collections have been disposed of as follows : — 



The geological specimens have been placed in the Woodwardian Museum at 

 Cambridge. Specimens of the skins and eggs of the rarer birds and my collections 

 in other groups of animals, in the British Museum of Natural History. The 

 collections of dried plants, in the Herbarium of the Royal Gardens at Kew. A 

 small collection of the skulls of the natives of Fakaofu and Tonga in the Museum 

 of the Royal College of Surgeons. 



The examination of the material is still in progress, but the following papers 

 have appeared : — 



'Woodwardian Museum Notes, Sections IV. and V.' by Alfred Harker, 



M.A., F.G.S., ' Geological Magazine,' April 1891. 

 * Hocks from the Tonga Islands,' ' by the same author, ' Geological Magazine/ 



June 1891 ; 



together with the following by myself: — 



' A Visit to the newly-emerged Falcon Island, Tonga Group,' ' Proceedings 



of the Royal Geographical Society,' March 1890. 

 ' Notes on the Natives of Fakaofu,' read before the Anthropological Society, 



March 1891. 

 ' Notes on the Birds of the Phoenix Islands,' read before the Zoological 



Society, April 21, 1891. 

 ' Notes on the Geology of the Tonga Islands,' read before the Geological 



Society, June 24, 1891. 



FRIDAY, AUGUST 21. 



The following Report and Papers were read : — 



1. Report of the Committee nominated for the purpose of arranging for the 

 Occupation of a Table at the Zoological Station at Naples. See 

 Reports, p. 365. 



2. On some Species of Diatoms ivith Pseudo'podia. 

 By J. G. Gkenfell, F.G.S., F.U.M.S. 



The diatoms are two small species of MeJo-nra and Cyclotella Kiitzingiana, 

 which occur mainly as isolated frustules and are non-motile. They have been 

 found in London, Hertfordshire, and "Wiltshire. The pseudopodia are delicate, 

 often invisible till the material is dried on a cover glass. Comparatively thick ones 

 are occasionally found. Gentian violet and methylene blue are good stains for 

 them. The pseudopodia are apparently non-retractile, generally straight, some- 

 times branched, but those of the earliest gathering in April were often repeatedly 

 branched. Their number is fairly constant. Most of them are placed fairly sym- 

 metrically round the edge of the valves. The length varies from two-and-a-balf 

 to nine times the diameter of the frustule. The diatoms are sometimes connected 

 by broad bands which seem to be anastomosed pseudopodia. Very similar bands 



' This paper includes the description of the specimens collected by Captain C. F. 

 Oldham, R.N., in his survey of 1890. 



