444 SECTIONAL TRANSACTIONS.— D, E. 



The Tetrapods were certainly derived from Crossopterygii, and the process 

 involved extensive changes in proportions ; the preorbital region was 

 drawn out while the oti co-occipital region was much shortened. 



The Actinopterygian ' parietal,' ' frontal,' etc., are not homologous with 

 the similarly named Tetrapod elements ; the ' frontal ' is approximately 

 equivalent to the Tetrapod parietal. The Actinopterygii evolved quite 

 independently. 



Various considerations strongly suggest that the primitive Choanate and 

 Actinopterygian skulls had a large number of dermal bones, some of which 

 were closely related to latero-sensory organs. In primitive forms of all 

 groups these bones become more important at the expense of intervening 

 bones. The latero-sensory canals are therefore of great value in deter- 

 mining bone homologies, but in many later forms new factors modify or 

 invalidate this primitive key. 



Dr. W. H. Thorpe. — Respiration in parasitic insects (3.45). 



SECTION E.— GEOGRAPHY. 



Thursday, August 18. 



Presidential Address by Prof. Griffith Taylor on Correlations and 

 culture ; a study in technique (lo.o). (See p. 103.) 



Symposium on The Scientific Delegation to India, 1937-8 : geographical 

 impressions (11.30). 



Prof. A. G. Ogilvie, O.B.E. — The Chota Nagpur plateau. 



The Chota Nagpur Highlands, almost bisected by the furrow used by 

 the Bengal Nagpur Railway, exhibit several distinct erosion surfaces, now 

 tentatively described. The river net, with its three dominant trends 

 (N.W.-S.E., E.N.E.-W.S.W., and W.-E.), suggests great captures by the 

 rivers Brahmani, Baitarani and Subarnarekha following the formation of the 

 Bengal Bay and Lowland. Westward recession of the plateau edges results 

 in abundant inselbergs on the eastern fringes. The relation of forests 

 (chiefly second growth sal) and agricultural land to surface relief is dis- 

 cussed, the position of mines indicated, and the distribution of population 

 surveyed in outline. 



Prof. H. J. Fleure, F.R.S. — The aborigines of the Chota Nagpur 

 plateau (12.0). 



Mr. J. McFarlane. — Jamshedpur ; an Indian industrial centre 

 (12.30). 



Prof. C. B. Fawcett. — South India (2.15). 



Some typical landscapes — tank and village, paddy field, hill country, 

 coastal forest — and the people and occupations in them. 



