6 ». 
which the canal cannot be penetrated, the left side coccus soas- 
tir^s is far enough in advance of the right one to penetrate* while 
the ri.ht does not* In that case the left aid* develops a typical 
guber r:ac ilu the rl«fet, a typical round li luaent. 
(l0) There is a sexual difference i the netted aci degree of 
io. en ration cf the steaonephros* “ ; esit takes place ouch more 
uniformly throughout its entire length» and the cranial group of tubuio. 
do not retain a connection with the rete of the gonad an i the olffimn 
duot, an is the case with sales* but the rete of the ovary retains 
•case connection throu h the degenerated a ■sonc-phres to the ostins* 
An epoophorors, tram. the cranial group of tubules, and a paroophoron, 
of a few tubules at tha posterior end of the gonad, frois the? caudal 
group of tubules, reaain at the 80*0 cm, al& o. 
In rsales, the cranial group o? tubules retain their connection 
with both rate testis sad olffian duct as p:rt of th opi idymis, 
and do not degenerate as in females. he caudal group of tubules 
degen rate?? as n the female, but raaaast* forss the paradidymis, and 
a single inol&ied one, the vac or ducto’ sberrans* * Ihe whole neao- 
neohron is slightly slower to degenerate in the sale* ana th:* rote 
testis doe? not connect to the ©'tier* looerali dieapps&r af ter 
1?.0 oa* ata ; e, and before £C.Q cm. stage in both sexes* 
In free-’sartine, in all those studied, except the 11*75 on* 
one, where the Wolffian ducts are absent in the anterior region, the 
era ial arotip of tubules act as u connection ot th- olffian duct tc 
the rate of the gonad m in sales t and, even in that cate, with no 
ant *r or end cf the Wolffian duct, the cranial fere up of tubules; le 
retained. In ihi later stages it far as part of tbe epididymis as in 
miss, but i:; behind the normal mal^, in state of development. In 
early stag -e studied, th^ rate is connected to thi omtiu remnant, 
though not so wall an in females, eh le in later stages it is not, 
and res rubles a younger roils condition* The ohtPWt^riitio paredidynis 
/ 
