Terrestrial Planarians from Japanese Territories. 



23 



Text tig. 10. Distribution of eye- 

 spots in Bipalium hilgendorji (von 

 Graff). 



into the ground colour of the head, which is much darker than the 

 rest of the dorsal surface. The ventral surface is much lighter than 

 the dorsal, except on the sole, where the colour is nearly white. 



The eye-sopts are arranged in one 

 or two rows along the margin of the 

 head, except on the lappets, where they 

 occur in loosely scattered distribution. 

 In addition there are present the eye- 

 spots around the body, at the sides of 

 the neck they are especially dense, ex- 

 tending over more ventral than dorsal. 



The mouth-opening lies somewhat 

 behind the centre of the body, opening 

 into tlie peripharyngeal chamber. In 

 the preserved specimen the pharynx 

 was protruded through tlie mouth-opening as a frill. 



The common genital aperture is situated at the commence- 

 ment of the second third of the distance between the mouth-open- 

 ing and the hind end of the body. 



The epidermis consists of a layer of columnar cells, which are 

 a great deal higher on the dorsal than on the ventral side. The 

 cilia are present on tlie surface of the sole only. Evidently wedged 

 in between the cells, except on the sole, are spindle-shaped rhab- 

 dites, which arise from their mother-cells, embedded in the 

 parenchyme ])elow th(; superficial muscular system. Numerous 

 glands, deeply situated in the body along the median line, make 

 their way to tiie surface of the sole. 



r)irectly below the fine basement membrane is the superficial 

 muscular system composed of two layers, outer circular and inner 

 longitudinal. The deep muscular system, separated from tlie 

 superlieial by a zone of tissue, forms a thick and continuous slieet, 

 and consist of two distinct sets of fibres, longitudinal and circular, 

 which occur intermingled in the same sheet, without being arranged 

 in definite layers. The longitudinal fibres are more strongly de- 

 veloped than the circular. 



Tile mouth-opening is situated near tlie centre oï the peri- 



