1914-] R. H. Whitehouse : Land Planarians. 463 



than at the front where they practically form only a single row. 

 The extreme anterior, in this specimen, is slightly insunken, a 

 feature which is due to contraction (see figs. 22 — 24). 



The living animal has, dorsally, a ground colour of orange 

 yellow (brownish yellow in spirit), with a well-defined thin median 

 black line, and a black line, a little distance removed from the 

 edge, on either side, a little broader, and rather less defined, 

 particularly on its inner border (see fig. 25). At the extreme pos- 

 terior all three merge, forming an almost black extremity (see fig. 

 26). Between the black lines the tone is somewhat dusky compared 

 with the outer edge which is bright orange yellow. This bright 

 zone is carried to the ventral side with very little difference in 

 shade except at the flat ambulacral surface itself which is much 

 paler, and measures a millimetre or less in width. On the dorsal 

 side of the head the longitudinal markings merge into a dark grey 

 pigmentation (see fig. 22) 



The genital aperture is very prominent, but the mouth is 

 much less so. 



In many features, this species resembles P. sondaica (lyornan), 

 but its colour, greater breadth and flat ambulacral surface differ 

 from the latter species. 



Cotyloplana pilleata, n. sp. 

 (Plate XXX, figs. 27 — 31.) 



About thirty specimens of this planarian are included in the 

 collection^ all from the Yembung and Rotung districts. The 

 largest specimen measures 105 mm. in length, even in a con- 

 tracted condition, and the smallest is 50 mm. long; most 

 specimens area little more than 70 mm. long, 4 to 5 mm. Vjroad 

 and 3 mm. in thickness, judging from the amount of wrinkling 

 shown, it w^ould appear that some of these planarians are 

 capable of an extension to quite 130 mm., and probably much 

 more. 



The dorsal surface is rather flat, while the ventral surface 

 may be strongly convex, though in one collection made in 

 Upper Rotung the ventral surface in all the specimens is nearly 

 as flat as the dorsal. The anterior end is raised at a considerable 

 angle (see fig. 29) and bears, on its upper side, the two eyes, 

 and on the ventral side, practically at the extreme anterior, 

 a single sucker (see figs. 28 and 30). Mr. Kemp remarks that in the 

 living animal the head appears slightly swollen, but this is 

 scarcely noticeable in the preserved specimens. 



While the colour-pattern remains constant, the shades of 

 colour vary very considerably. There is a mid-dorsal d ep 

 black fine running from the extreme anterior (in some few 

 cases starting short of this) to the posterior extremity, widening 

 quite perceptibly above the pharyngeal and genital regions. 

 On either side of this line is a narrow strip of bright lemon yellow, 

 which is not always well defined from a broad lateral brown band. 



