168 
the cells are arranged in meshes or thinwalled tubes, which are 
most numerous behind. There are many different stages of these 
cells; some of them are round and provided with an oblong nucleus, 
others, certainly spermatozoa, consist of an irregular terminal nucleus 
and a kind of a tail. In well preserved material it would most likely 
be easy te follow the development of the spermatozoa in details. 
The ,,testes" are probably directed downwards in front and discharge 
into a bifurcate ringed sac before the ,,vestibule" (fig. 3 & 8v) 
which is filled with spermatozoa (fig. 2 & 8 pe; fig. 16). Besides 
in this one there is only found spermatozoa in the hindmost part of 
the testes. The relation between the oviduets and the testes and 
their structure must be referred to the investigation of those who 
have better material at their disposal. 
The Accessory (7lands. The accessory glands (fig. 2, 3, 4, 9, 
10, 18 & 19) are very well developed and are placed just under 
the skin behind the genital opening, filling a great part of the 
abdomen, There are two pairs of glands and a single undivided 
one which all seem to debouch into the ,,vestibule”. The median 
unpaired gland (g) is a long hollow sac, chiefly in front com- 
bined with the ventricle, the lateral and median paired glands. 
The upper part of this sac is by a fold from its upper wall divided 
into a right and a left part. The lateral parts of the lumen are 
somewhat flattened in front in contrast to the median raised one, 
as these lateral parts are below and above covered by the median 
and lateral paired glands (fig. 9). This unpaired gland is connected 
behind with a pair of round glands, always visible through the skin. 
These the hindmost paired glands have very thick walls and a narrow 
cavity in connection with that of the median gland (fig. 2, 3 & 105). 
The walls of- these glands consist of several layers of cells, mostly 
only marked by distinct nuclei. Just below the foremost part 
of the unpaired gland there is on each side an elongated body 
with narrow lumen, the anterior median paired glands (fig. 3, 9 4)- 
It seems most probable to me that all these organs are glands, 
though their histological structure is not completely convincing. 
