Terrestrial Planarians from Japanese Territories. 39 



The worm has, clorsally, a uniform deep green colour, except 

 on the head, where the colour is grayish brown. The ventral 

 surface is of a much lighter colour than the dorsal, except for the 

 surface of the sole which is pale. 



The eye-spots are arranged in one or 

 two rows all round the margin of the head 

 and continue sparingly for a considerable 

 distance along the sides of the body. At 

 the sides of the neck they are somewhat 

 closely packed. 



The mouth-opening is placed at a- 

 bout the hind end of the first third of the 



length of the body, leading into the Text % 20. Distribution of 



peripharyngeal chamber. eye-spots in Plaœcephalus glau- 



CU8 n SD 



The common genital aperture is situat- 

 ed at a short distance behind the mouth-opening. 



The epidermis is made up of a layer of columnar cells which 

 are of a greater height on the dorsal than on the ventral side. The 

 cilia are present on the surface of the sole only. Wedged in be- 

 tween these cells, except on the sole, are numerous rhabdites of a 

 spindle-like shape. Deep below the epidermis, in the parenchyme, 

 exist "such rhabdites as are still contained in their mother-cells. 

 Besides the glands, deeply situated in the median line of the body 

 and opening out on the sole-surface, there occur some glands 

 which open in scattered distribution all over the surface of the 

 body. 



Directly inwards to the basement membrane is the superficial 

 muscular system composed of the outer circular and the inner 

 longitudinal layer. The deep muscular system is well developed 

 all round in the parenchyme as a thick and continuous sheet, chief- 

 ly consisting of longitudinal fibres. 



The moutli-opening lies near the middle of the periphar3mgeal 

 chamber, in which is disposed the plicated pharynx from above. 

 The gut trunks give off numerous subdivided lateral branches, the 

 epithelium of which shows no noteworthy features, consisting, as it 

 does, uf high columnar cells. 



