1914-] R- H. Whitehouse : Land Planarians. 461 



umber stripe, which in turn merges into a broader band of dark 

 chestnut colour ; outside this, and sharply defined at both edges, 

 is a broad black stripe ; beyond this, and at the extreme edge of 

 the body, most specimens show a very narrow pale buff stripe, 

 which, however, may be regarded as an encroachment of the 

 ventral colouration. In general, the posterior end of the body is 

 darker than the rest, the paler bands being much suppressed; 

 the relative breadths of the colours between the broad and narrow 

 black lines also vary frequentl}- ; occasionally, too, the inner pale 

 umber is absent and its place taken by the dark chestnut colour 

 which pales on reaching the outer black band. 



In the region of the neck all the bands merge into a dusky 

 area, but the head itself has a distinctive colouration, consisting 

 of two semicircular bands, well defined from one another, a black 

 border piece and an inner pale buff band (see fig. 17). 



Ventrally, the ambulacral surface, scarce!}' raised above the 

 general level, is very pale yellow — almost white — its width being 

 about a quarter that of the body. On either side the colour may 

 be described as a warm straw shade, sUghtly paler anteriorly. 

 The mouth is situated at about the middle of the under surface, 

 though occasionally it is a little beyond the middle. The genital 

 aperture is three or four millimetres behind the mouth. 



Appendix I . 



It has been thought advisable to include a separate description 

 of one specimen {ZEV'--f''-) on the ground of a striking difference 

 in the form and colour pattern of the anterior extremity, as well as 

 minor differences in colour. Future investigation of the internal 

 anatomy of this specimen will finally decide its position, but in 

 the meantime it is probably better to include it here. 



The specimen is 52 mm. long with an almost uniform breadth 

 of 24 mm. ; its thickness measures only i mm. against the 3 mm. 

 of the 24 mm. specimens ; and the mouth and genital aperture 

 are respectively 21 mm. and 36 mm. from the anterior end. 



The patterns of the dorsal surface of the trunk are almost 

 identical with the other specimens so far as the longitudinal black 

 lines areconcerned, except that the inner black stripes are propor- 

 tionately a very little thicker. The real colour difference in the 

 trunk is that between the inner and outer black lines is a pale 

 lemon shade, chestnut-brown being entirely absent. Such com- 

 paratively insignificant a variation is not sufficient justification 

 for separate treatment, but there is a striking difference in the 

 form and colour of the anterior end. Here the specimen conforms 

 to the Geoplanid type ; no head-lobes are present and there is 

 no sign of a neck ; the eyes are placed laterally and are sparsely 

 distributed (see figs. 18 and 19). In colour there is a complete 

 absence of the broad black seam round the anterior end, and 

 nothing but a general dusky tone indicates the clearly defined head 

 of the other specimens (see fig. 16). It is possible that the 



