129 
sondaicus, in that a spiral-shaped ridge has been caused by the 
different heights of the epithelial cells. In Cr. sondaicus shell giands 
empty into this section of the vagina. These giands have not been 
developed in any great number, but scattered and very long secre- 
tory duets coming from quite a distance are found. The secretion 
contains very small corpuscles, only 1 jn, and has, when stained 
with eosin, assumed the same clear scarlet colour as the rhabditi. 
'rext-fig. 18. Cryptophallus sondaicus. Female apparatus' in longitudinal section. 
Diagram combined from numerous sections. 65 x. dv, ductus vaginalis; ie, wall 
of the main intestine; mu, median uterine canal; rd, rudimentary duet in 
connection with the ductus vaginalis; v, vagina. 
One must presumably agree with Lang in considering these giands 
as genetically derived from the rhabditi giands. The median uterine 
duet enters the vagina at its highest point; that is, shortly after 
it curves. This duet runs direetly dorsally and is longer than that 
of Cr. ivahlbergi. Tbus the ductus vaginalis forms the direct con- 
tinuation of the vagina backwards, meanwhile also approaching the 
ventrah side of the body. It might be mentioned that in my 
specimen the duet in question soon turns slightly aside, because 
at that place the gut is very mueh dilated on account of a ball 
of exerement. This displacement has caused the distal end of the 
duet to curve back here toward the median line. This curve, how- 
ever, reaches the region back of the genital pore first, so that in 
its most distal course the ductus vaginalis again runs in a forward 
direction. Text-figure 18 does not show the sideward bend of the 
vagina and ductus vaginalis; consequently the ductus vaginalis 
appears too short. 
An anomalous formation that might be mentioned in passing is 
Vidensk. Medel. fra Dansk naturh. Foren. Bd. 79. 
9 
