ONYCHOPHORA OR PROTOTRACHEAT. 321 
Coxal or crural glands lie in the legs and open to the exterior. They 
can be in part evaginated, and they probably help in respiration. In 
the male of P. capgenszs the last pair are very long (Fig. 168, a.g.). The 
large mucous glands, which pour forth slime from the oral papillz, are 
regarded as modified crural glands. 
eproductive system.—(a) Female (of P. edwardszz).—From the 
two ovaries, which are surrounded by one connective tissue sheath, and 
arise, as usual, from the coelomic epithelium, the ova pass by two long 
ducts leading to a common terminal vagina opening between the second 
last legs. These ducts are for the most part uteri, but on what may be 
called the oviduct portions adjoining the ovaries, there are two pairs of 
pouches—a pair of receptacula seminis (for storing the spermatozoa 
slg. 
| 
>: Use 
sid. 4 08 vw.| co ewe 
wae ph. Z s.0.17] cl 
at, : A A_A oh Dr 
tat taal Suited, p 
5.0.4 i 
5.0.5 oe 
“06.60 eT ag as 
Fur Fa 
Fic. 168.—Dissection of Perdpatus.—After Balfour. 
az,, Antenne; o7.4,, oral papille; c.g., cerebral ganglia; sé.d., 
duct of slime gland (s/.g.); 5.0.8, eighth segmental organ or 
nephridium 3 v.c., ventral nerve connected by transverse com- 
missures (co.) with its fellow; s.o.77, seventeenth nephridium ; 
£.0., genital aperture ; A., anus; 4.d.c., posterior commissure ; 
f.17, seventeenth appendage ; a.g., last crural gland—that of 
the opposite side is marked v.g.; 7.1, 7.2, first and second 
legs; 0¢.co., esophageal nerve commissure ; ve., cesophagus ; 
~A., pharynx—the remainder of the gut is removed. 
received during copulation), and a pair of receptacula ovorum for storing 
fertilised eggs. 
The eggs are hatched in the uteri, and all stages are there to be found 
in regular order. The young embryos seem to be connected to the wall 
of the uterus by what has been called « ‘‘ placenta,” so suggestive is it 
of mammalian gestation. The older embryos lose this ‘‘ placenta,” but 
each lies constricted off from its neighbours. When born the young 
resemble the parents except in size and colour. In P. capemszs the 
period of gestation is thirteen months. 
(4) Male (of P. edwardsiz7).—The male elements are produced in 
small testes, pass thence into two seminal vesicles, and onwards by two 
vasa deferentia into a long single ejaculatory duct, which opens in front 
? 
21 1 
