282 Geological Society. 



tudinal ribs. In the oral parts HaphphtJiahnus differs from 

 Trichoniscus in the structure of the maxillipeds, the terminal 

 part of which is 5-articulate, while the epignath is simple 

 and lanceolate. 



Other species belonging to the Tn'choniscidce taken at 

 Kew on that date were Trichoniscus pusillua, Brandt, 

 T. pygmceus, G. O. Sars, T. roseus (Koch) , Trichoniscoides 

 alhidus (B.-Lund), Haplophlhalmus dauicus, B.-Lund, and 

 H. mengii (Zaddach). 



Note. — A preliminary description of T. linearis was read 

 to the Glasgow Natural History Society on January 28th, 

 1908. 



EXPLANATION OF PLATE XI. 



(5 . Male specimen of Trichoniscus linearis, about 3 mm. 



a'. Antennula. 



A. Antenna. 



Jl. Flagellum of antenna. 



??i' . First maxilla. 



mp. Maxilliped. 

 prp. 7 (5" . Seventh peraeopod of male. 

 pip. 1 c? ■ First pair of pleopoda of male. 

 pip. 2 S • Second pair of pleopoda of male. 



T. Last segment of metasome with uropoda. 



m^ is magnified on a higher scale than mp. 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



November 6th, 1907.— Sir Archibald Geikie, K.C.B,, D.C.L., Sc.D., 

 Sec.R.S., President, in the Chair. 



The following communications were read : — 



1. ' On a Collection of Fossil Plants from South Africa.' By 

 Prof. Albert Charles Seward, M.A., F.R.S., F.G.S. 



The material on which this paper is based was, for the most part, 

 collected by members of the Geological Survey in Cape Colony from 

 the Molteno and Burghersdorp Beds, The Molteno Beds are placed 

 at the base of the Upper Karroo, or Stormberg Series ; the Burghers- 

 dorp Beds constitute the uppermost strata of the Middle Karroo, or 

 Beaufort Series. Mr. A. L. Du Toit, who has contributed accounts 

 of the stratigraphy of the plant-bearing and associated rocks. 



