147 
concerning the prostatic organ. The original text, which may be 
compared with my text-figure 29 and 30 and Plate IV, Figs. 24 and 
31 runs as follows; 
„The male aperture leads into a nearly vertical antrum, the 
epithelium of which is thickened and raised into ridges. Here are 
situated the unicellular giands corresponding to the prostate giands. 
Into the antrum projects the penis in the form of a short muscular 
papilla entirely devoid of chitinous parts. The ejaculatory duet, 
formed by the union of the lateral vasa deferentia, is a sinuous 
tube which presents no appearance of becoming thickened or dilated 
to form a vesicula seminalis. 
The antrum femininum is a vertical chamber with a fairly thick 
muscular wall. The ootype curves forwards and upwards from the 
antrum and bends sharply downwards and backwards to form the 
dorsal limb of the vagina. The ootype is characterized by the deve- 
lopment of a peculiar spiral ridge of its epithelium. The dorsal 
limb of the vagina, after receiving on its ventral side the common 
duet formed by the union of the lateral uterine duets, runs back¬ 
wards as a narrowing tube, which opens behind into the median 
posterior branch of the intestine — a genito-intestinal passage 
being thus established.“ 
This description agrees, indeed, rather well with the conditions 
found in my material. But granular giand cells are not observed 
in the antral epithelium. „The median posterior branch of the 
intestine“ is the hinder part of the main gut. In my series of 
sections it has no bead-like appearance as the true coeca. 
When I made my revision of the Acotylean Polyclads in 1913, 
I had of course to relie solely on Haswell s description, cited 
above. It was evident that the genus belonged to my new group 
Craspedommata, As to the ranking in family, the absence of a prostatic 
vesicle, the singular development of the female apparatus, no notices 
about tentacles or tentacular groups of eyes, of alimentary system, 
etc. brought serious difficulties. Anyhow, the proposed close rela- 
tionship to Discocelis {Thalamoplunci is by me included in that genus) 
seemed to me dubious, and I then placed EntcTOgOfiiu together with 
Microcelis in the family Cryptocelidae. The presence of giand cells 
in the antral epithelium was regarded by Haswell as a substitute 
for a prostatic organ. But Discocelis^ supposed to be allied, is 
10 * 
