66 W. MILNE ON THE 



straight setae which quiver, but do not lash, and some shorter 

 ones which were not seen to quiver. 



The antenna is stout and fairly long, and the brain mass is 

 small, far back and without eye-spots. Flocculent matter sur- 

 rounding the vascular canals makes them very prominent in the 

 neck. The jaws are elongated and bear four teeth on each side ; 

 two of these are very broad and large, and two — one on each side 

 of the large ones — smaller but considerably larger than the extra- 

 ordinarily large striae, and with well-defined points. 



There are three ventral nucleated glands under the mastax, 

 probably gastric; Two or three decided lateral ridges can be 

 seen on the trunk, but there is no wrinkling when creeping. 

 Quite characteristic is the shape of the lumbar region with stifi 

 borders, and the anal and pre-anal segments not well marked off 

 from each other. A long and convoluted stomach ends in a round 

 and not very large intestine. The contractile vesicle is large and 

 of fairly short period when feeding, and when it contracts crumples 

 in towards the middle slowly. For so big an animal the foot is 

 narrow ; the spurs on the first segment are flat and triangular, 

 and set very near each other. Somewhat similar to those of M, 

 quadricornifera are the ordinary spurs, but less deeply cut between 

 the tips, and more approaching a straight line. The four toes 

 are short and stubby and not far separated from each other, the 

 front two are the thicker (fig. 46). 



The corona is very wide-spreading and well over one-fourth of 

 the length of the fully extended animal, and nearly as wide as 

 that of P. grandis. The sulcus is slightly narrower than the 

 wheel. A thin ridge or membrane with a V-shaped gap was seen 

 ventrally between the pedicels, similar to that in P. grandis. 

 Corona, collar and neck are to each other as 43, 31, 24. 



The striking upper lip is rather complicated and will be best 

 followed from the figure (PL 3, fig. 4a). No central setae 

 were noticed on the wheels. P. childi is stippled in a manner 

 precisely like P. grandis; the stippling is equally beautiful, with 

 the same honey-comb appearance, and it is never difficult to make 

 out ; the trunk, lumbar region and spurs are the parts stippled. 



An egg, very large, broadly oval, and dark in colour, was 

 deposited on the slide five days after the animal was enclosed, 

 and the division of the cells watched for some time. 



There is another animal almost as large, which I have thought 



