630 Dr. A. C. Stokes on some 



foot-glands large, elongate-ovate ; muscle-bands slender, 

 conspicuous, numerous. 



Length about j^q inch. 



Movements rapid. 



My artistic skill is not great enough to enable ine to draw 

 this creature so as to give any idea of its crystalline trans- 

 parency and brilliancy. The figure, therefore, is little more 

 than a diagram to present the Rotiferon's contour as accu- 

 rately as possible, with some indication of the position and 

 proportionate size of the internal organs. A professional 

 artist of great skill would be needed to do more. 



Diglena contorta, sp. n. (PI. XIV. fig. 5.) 



Body elongate-subcylindrical, gibbous posteriorly, the 

 front usually neck-like, the entire animal capable of consider- 

 able elongation and narrowing, when the gibbous region 

 becomes flattened ; front rounded, usually convex, bearing a 

 small hook-like proboscis, beneath which the frontal border 

 is conspicuously emarginate; ventrum flattened; dorsum 

 rounded, suddenly but evenly depressed posteriorly, thence 

 continued as a subcylindrical prolongation, the termination of 

 which overhangs and almost completely surrounds the short 

 rounded foot which projects from it as a small subglobose 

 papilla ; toes two, small, short, conical, divergent ; cilia fine, 

 short, numerous, filling a narrow elongate-obovate field, 

 entirely prone and about one third the length of the animal ; 

 auricles present, small, apparently represented when retracted 

 by a flabelliform or irregularly oval and conspicuously ciliated 

 region on each lateral border of the head, although it is 

 difficult to determine positively whence the organs are pro- 

 truded, as the Rotiferon's movements are then rapid and 

 erratic ; dorsal antenna two ; lateral antennas two ; eyes not 

 observed; brain large, long, saccate, extending from the 

 front for about one third the entire length of the body, a 

 small cluster of dark granules near the tip ; mastax large, 

 elongate-ovate, beneath the brain and extending scarcely 

 beyond its tip ; trophi weak, apparently forcij)ate ; gastric 

 glands immediately behind the mastax ; stomach and intes- 

 tine ciliated, not diftercntiated from each other except by the 

 presence within the stomach and immediately next to the 

 walls of a crowded layer-like mass of dark-bordered granules, 

 sometimes grouped into distinctly polygonal areas, and often 

 so numerous that they obscure all the rest of the internal 

 anatomy ; intestine comparatively thin-walled and without 

 the conspicuous granules of the stomach-walls ; ovary poste- 



