Terrt striai Planarians from Japanese Territories. 1 7 



The dorsal surface, in spirit, is of a dark colour with a touch 

 of olive-hke brown and marked with a- black median stripe, ex- 

 tending over almost the whole length of the body. Ventrally, the 

 colour is nearly similar to that of tlie dorsal surface, except for the 

 surface of the sole which is nearly white. 



The eye-spots are thickly set along all the margin of the liead 

 and also occur sparsely scattered over the whole length of the body. 

 At the sides of the neck they are somewhat closely nacked. 



The mouth-opening which leads into 

 the peripharyngeal chamber lies slightly 

 behind the middle of the body. In some 

 preserved specimens examined the phar- 

 ynx was protruded through the mouth- 

 opening as a frill. 



The common genital aperture is placed 

 slightly in front of the middle of the dis- 

 tance between the mouth-opening and the 



J • 1 i? xi 1 1 Text fig. 7. L))stribution of 



posterior end of the body. eye-spots in Bipalium k>soensù. 



The epidermis is somewhat thicker ''•'^■ 

 on the dorsal surface than on the ventral and full of minute 

 spindle-shaped rhabdites, evidently situated between the epidermic 

 cells, except on the sole-surface. Deep below the epidermis, in the 

 parenchyme, are found the rhabdites enclosed in their mother- 

 cells. Numerous glands, deeply situated in the median plane of 

 the body, make their way to the surface of the sole. 



The superficial muscular system consists of the outer circular 

 and the inner longitudinal layer. Separated from this by a zone 

 of tissue is the deep muscular system which is composed of two 

 sets of fibres, longitudinal and circular, these two sets occurring 

 intermingled in the same sheet. 



The mouth-opening lies near the centre of the peripharyngeal 

 pocket with the plicated pharynx. The gut trunks are provided 

 with numerous subdivided lateral branches, which consist, as usual, 

 of high columnar cells. 



In the region of the head the nervous system forms a mesh- 

 work which passes behind into two longitudinal nerve cords, con- 



