FRESHWATER TRICLADS FROM THE BASIN OF 

 THE INLE LAKE. 



By ToKio Kaburaki, Rigakushi, Science College, 

 Imperial University, Tokyo. 



(Plate XXVII). 



In the present paper a record is given of three new species of fresh- 

 water planarians from the basin of the lule Lake, Southern Shan States, 

 Burma, which were collected by Dr. N. Annandale and Dr. F. H. Gravely 

 of the Zoological Survey of India, in the latter part of February, 1917. 

 The specimens were sent to Professor Oka of the Higher Normal School 

 of Tokyo, who kindly gave them over to me for examination. To the 

 gentlemen named I beg to express my thanks for the opportunity of 

 studying these interesting planarians. I deem it my duty to mention 

 my indebtedness to Professor Ijima for kind assistance in many respects, 



Flanaria burmaensis, n. sp. 

 PI. XXVII, figs. 1, 4, 5. 



This new species is represented by six individuals (W. ^\~) in the 

 collection. They were obtained from the middle of the Inle Lake, 

 Southern Shan States, from a muddy bottom in about 12 feet of water. 



The head in the preserved state presents a triangular shape and 

 merges behind in the trunk without being marked oii by a neck-like 

 narrowing. The trunk gradually widens backwards to the region of 

 the genital end-organs and then begins to taper rather abruptly, to end 

 with a point at the posterior body-end. The mature specimens measure 

 5 — 7 mm. in length and TS — 2 mm. across the widest part of the body. 



The ground colour of the dorsal surface is usually light drab. There 

 exist no pigments. One of the individuals with well-developed genital 

 organs presents on the dorsal side a light grayish-olive colour due to the 

 gut contents, the positions of the pharynx and copulatory organs being 

 marked by clear brownish colouration (fig. 1) ; the ventral surface is 

 of a much lighter colour, except the genital end-organs which appear 

 of a blackish colour. 



The crescentic eyes exist at about the level of the tips of the lateral 

 lappets ; the distance between them is somewhat less than that of either 

 eye from the tip of the lappet of the same side. Only in the grayish 

 individual mentioned above the eye is surrounded by a colourless area. 

 The eye consists of a pigment cup and of numerous retina cones, just 

 as in PI. gonocephala. The species is wholly destitute of colourless areas 

 corresponding to the auricular sense organ. 



Th ; epidermis is somewhat thicker on the dorsal than on the ventral 

 side. The complete absence of rhabdites in both the epidermis and 



