530 
HENRY LESLIE OSBORN 
Cotylaspis insignis (Osborn '04) would be a quite unnecessary 
luxury. It would be quite easy to imagine that in Cryptogonimus 
the wastes of the body find their way into the large anterior cav- 
ities and thence to the posterior cavity. We must suppose that 
Cryptogonimus is descended from large sized ancestors and that 
its diminutive dimensions are secondary, just as we should suppose 
in the case of Cyclops among the Crustacea and Diemyctylus 
among the urodeles, and we are justified in recognizing simplicity 
in organization as possible and adaptive in all these cases, as it 
evidently is in the case of the lungless salamanders. 
REPRODUCTIVE SYSTEM 
The ground plan of the reproductive apparatus is shown in 
fig. 1. The parts of the apparatus are confined to the middle 
and last thirds of the body. The spermaries and ovary are oppo- 
site, the former being dorsal and the latter ventral. There is a 
very large seminal vesicle, no cirrus organ, a small ejaculatory 
duct. The terminal passage common to the male and female 
apparatus, opens to the exterior between the two ventral suckers. 
The coils of the uterus are confined entirely to the hinder bod}^- 
third. No Laurer canal opening has been recognized. The vitel- 
laria are composed of numerous small glands restricted in loca- 
tion to the central regions of the body. 
The spermaries, fig. 2, lie almost on the same level directly be- 
low the dorsal body wall. Fig. 2 shows that one is placed on the 
left side and the other on the right, and the right is slightly in 
advance of the left. They are oval and compact, measure 0.2 mm. 
and 0.3 mm., respectively. No cellular wall can be seen in any of 
my sections. Distomes difi'er in this point, in some, e.g., Cotylas- 
pis (Osborn, '04, fig. 38), a wall of nucleated cells can be dis- 
tinctly seen. A surface layer of cells ^'parietal cells" can be 
seen in sections while the interior is made up of cells showing more 
or less evidence of activity in the direction of spermatogenesis. 
The parietal cells are somewhat smaller than the central cells, 
each one possesses a relatively large nucleus which is very granu- 
lar and deeply stained. The central cells are larger than the pari- 
