139 
a second spøciøs of which is described in this paper, and for 
Bergendalia (Laidlaw 1903, Yeri and Kaburaki 1918). In the latter 
genus there is a well separated aperture for this duet behind the 
female gonopore, while in Cryptophallus the ductus vaginalis opens 
Text-lig. 26. Kabiirakia excelsa. Genital apparatus in sagittal section, 40 x. 
de ductus eiaculatorius; dv, ductus vaginalis; dva, external opening or tue 
ductus vaginalis; e, egg, just entering the median uterine canal; p, penis; 
prv, proståtic vesicle; sdd, sdp, distal and proxmial part respectively of the 
Shell duet (ootvpe). Outline of muscularis is dotted, shell giands indicated as 
short lines, and the presence of extra-capsular prostatic giands, the exits ot 
which traverse the muscular envelope of the vesicula granulorum, is indicated 
through fine dots. 
into the distal part of the vagina. Thus there is formed a small 
but distinet antrum femininum. Here again the ductus vaginalis 
presents a feature that deviates slightly from the conditions in 
Bergendalici and in Cryptophallus. On the one hånd, it is not 
accurate to say that the ductus vaginalis opens into the vagina, 
on the other hånd, the separation from the vaginal opening is not quite 
distinet. To speak of a second female pore does not fully explain 
the condition. In the median, sagittal sections the ductus vaginalis 
appears to open at the hinder border of the vaginal opening. It is 
perhaps too mueh to say that the two duets open together in a 
pitlike depression, but anyhow it is not very far from the truth, as 
a look at text-fig. 26 will show. 
The vagina (text-fig. 26) of the new genus is doubtlessly bettei 
developed than that of the genus Stylochus, but this is only valid 
for its most important part, the shell duet. Almost direetly after 
the beginning the vagina bends forwards; the pars externa is 
extremely short, as the shell giands openings oceur very close to 
