536 RICHARD EVANS. 



PLATE 36. 



Fig. 35. — This figure represents a transverse section passing immediately 

 in front, of the pennltiinate pair of legs of E. Horsti. Tlie left vas deferens 

 (/.«. (^.) is cut across twice, the right one (r.v.d.) passes under the nerve- 

 cord (u. c), and is cut across twice on the right side. Tiie nerve-cords («. c.) 

 api)roach each other below the rectum {>■(.), and present a kind of a ganglionic 

 swelling situated immediately in front of the male genital orifice. In the 

 dorso-lateral part, in cavities of their own, are seen the male accessory glands 

 {m.a.g.). The ductus ejacuiatorius with its much-lhickened wall appears on 

 the left side immediately under the left nerve-cord. In order to understand 

 the topographical relations of the male genital ducts and the nerve-cords. 

 Figs. 35 — 37 should be compared. 



Fig. 36. — An enlarged representation of the male genital organs of Eo- 

 peripatus Horsti. The small numbers (38—48) placed outside the figure, 

 and at the ends of lines crossing the genital ducts in various positions, refer 

 approximately to I he positions of the sections drawn in Figs. 38 — 48. The 

 rectum (//.), which passes between the coils of the vasa deferentia, is repre- 

 sented as having been cut close to the posterior end of the stomach on the 

 one hand, and near the anus on the other. Note that the ductus ejacuia- 

 torius is drawn out into a long loop on the left side, the lines bearing the 

 numbers 44 — 48 cross it at. various places. The male accessory glands 

 {m.a.g.) are shown as two small tubes situated between the terminal end of 

 the ductus ejacuiatorius and the posterior end of the rectum. 



Fig. 37. — This figure shows the relations of the nerve-cords, which are 

 represented in black, to the various organs shown in Fig. 36, which iu the 

 present figure are drawn only in outline. 



Fig. 38. — A transverse section of the testes of Eoperipatus Horsti. 

 See number 38 in Fig. 36. 



Fig. 39. — A transverse section of ihe duct pas;^illg from the testes to the 

 seminal vesicle of Eoperipatus Horsti. See number 39 in Fig. 36. 



Fig. 40. — A transverse section of the vas deferens, close to the seminal 

 vesicle, of Eoperipatus Horsti. See number 40 in Fig. 36. 



Fig. 41.— a transverse section of the much-coiled vasa deferentia of 

 Eoperipatus Horsti. The tube marked s. g. represents one of the branches 

 of the slime-gland. In the tubes on the left of the figure are several loosely- 

 arranged spermatozoa, but in those ou the right they are arranged in a compact 

 and characteristic way round a common centre. See number 41 in Fig. 36. 



Fig. 42. — A transverse section of the vasa deferentia of Eoperipatus 

 Horsti. The ducts have a common sheath, but their lumen are still separate. 

 The spermalophores are completely formed. See number 42 in Fig. 30. 



Fig. 43. — A transverse section of the common genital duct close to the 



