XXXVI. LAND PLANARIANS. 



By Richard H. Whitehouse, M.Sc, Professor of Biology, Agra 

 College, late of Queen's University of Belfast. 



(Plates xxix, xxx.) 



Introduction. 



The collection of land planarians to be described will prob- 

 ably rank as one of the most interesting of ^Ir. Kemp's many- 

 collections from the Abor Country. I particularly wish to express 

 my indebtedness to Mr. Kemp for the privilege of working at these 

 planarians ; the task has been made much easier by his excellent 

 series of sketches and notes on colour made from the living 

 animals. These notes have been incorporated in the descriptions, 

 the reliability of which has thereby been greatly increased. 



The present accounts are the result of external examination 

 only, but it is hoped that at least some of the species will be 

 subjected to full anatomical investigation as soon as possible. 



I wish to express my gratitude to the Belfast Natural His- 

 tory and Philosophical Society for assistance which enabled me 

 to examine the land planarians in the British Museum collec- 

 tion; my best thanks are also tendered to Mr. H. A Baylis for 

 providing me with opportunities and accommodation for the 

 examination of the Museum material. 



Bipalium dihangense, n. sp. 

 (Plate xxix, figs, i — 3.) 



Nine specimens of this species are included in the collections. 

 It appears to be the commonest Bipalium in the Abor and 

 surrounding country, it having been procured along the whole 

 of the valley of the Dihang River. The animals were found 

 attached to a variety of objects including stones, logs and leaf- 

 stems of plantain, and in districts varying from 600 ft. to 2000 ft. 

 in altitude. 



In shape the animals conform to the t5''pical Bipalium outline 

 with broadly spread semicircular recurrent head-lobes, which in 

 some cases curve so far inwards as to meet the sides of the neck 

 (see fig. 3). The trunk, rather stoutly built, tapers gradually to 

 a pointed extremity. The smallest specimen measured 53 mm. 

 in length and 4 mm. in breadth, while the largest was 92 mm. 

 and 7 mm. in length and breadth respectively; they present a 



