TWO NEW SPECTRS OF ONYCHOPHORA. 537 



union of tlie vasa deferentia. The spermatopliores have not yet, fused. See 

 number 43 in Fig. 3G. 



Fig. 44. — A transverse section of the common genital duct at some distance 

 from that sliown in Fig. 43. The spermatophores have fused together, hut 

 in the arrangement of the spermatozoa tliere are signs of a double origin. See 

 number 44 in Fig. 36. 



Fig. 45. — A transverse section of the descending limb of the common 

 genital duct of Eoperipatus Horsti. The head of the spermatophore has 

 been cut through tvi'ice, and the spermatozoa are arranged in two groups 

 round two centres. The wall of the duct is as vet comparatively thin. See 

 number 45 iu Fig. 30. 



PLATE 37. 



Fig. 46. — A transverse section of the ductus ejaculatoiius of Eoperi- 

 patus Horsti. Tlie wall is greatly thickened; but the lining cells are tall 

 and columnar. See number 46 in Fig. 36. 



Fig. 47. — A transverse section of the ductus ejaculatorius of Eoperi- 

 patus Horsti. The wall is very thick, but the lining cells, though columnar, 

 are much shorter. See number 47 in Fig. 36. 



Fig. 48. — A transverse section of the ductus ejaculatorius of Eoperi- 

 patus Horsti. The wall is extremely thick, and the lumen is correspond- 

 ingly small. See number 48 in Fig. 36. 



Fig. 49. — This figure represents a dissected-out ovary, etc., of Eoperi- 

 patus Weldoni. It shows the ovary enormously spread out, one recep- 

 laculum ovorum (re. o.), and two receptacula seminis {re.s.), as well as the 

 commencement of the two uteri. The ova are also seen suspended in thin- 

 walled sacs, which hang freely in the vascular body-cavity. The lines bearing 

 the numbers 50, 51, and 52 mark the position of the sections shown in Figs. 

 50, 51, and 52. 



Fig. 50. — This tigure represents a section along the line marked 50 in Fig. 

 41). It passes through the receptaculum ovorum {re. o.) and through one 

 oviduct {ovid.). The other oviduct is not cut across, as the section o-oes 

 through the opening passing from the extended cavity [cav.) of the ovary to 

 the oviduct. 



Fig. 51. — This figure represents a section through the receptaculum 

 seminis (?r. 5.) and the proximal end of the uterus {ut.). Note the highly 

 columnar lining of the latter, and the comparatively thin wall of the former. 

 One of the ducts passing to the receptaculum seminis is shown embedded in 

 its wall, and lined by cells with small nuclei. 



Fig. 52. — This figure represents a section across the uterus at the position 

 marked by the line bearing the number 52 in Fig. 49. Note the comparatively 

 thick wall and columnar lining. 



VOL. 44, PART 4. NEW SERIES. M M 



