Ix EXPLANATION OF PLATE 53. 



Fig. 39. Side view of same embryo. 



Figs. 40 42. Drawings by Professor Balfour of three transverse sections through 

 the embryo from which fig. 36 was taken. (Zeiss c, Camera. ) Figs. 40 and 42 pass 

 through the region of the blastopore. 



61. Blastopore. ep. Epiblast. hy. Hypoblast. me. Mesenteron. mes. Meso- 

 blastic somite. 



Fig. 43. Male generative organs of Peripatus capensis, viewed from the dorsal 

 surface. (From a drawing by Miss Balfour.) 



a. g. Enlarged crural glands of last pair of legs. F. 16, 17. Last pairs of legs. 

 f. Small accessory glandular tubes, p. Common duct into which vasa deferentia 

 open. #. r. Prostate, te. Testes. v. c. Nerve-cord, v. d. Vas deferens. 



