The uterus is very voluminoas ancl fills more than half thè body. It lies ventral 
to all thè other organs except thè intestine. It is especially well developed an- 
teriorly where it forms a mass of convolutions spreading towards thè left side 
of thè body and even overlapping thè anterior sucker. Behind thè pharynx it is 
not so densely packed. Its generai tendency is towards thè left side and as a 
rule it does not encroach on tlie space occupi ed by thè ovary and testes. The 
ova are very numerous, light to dark brown in colour and regularly ovai in 
shape. They are rather small, measuring only • 018 - • 024 mm. in length and 
•012 - ‘015 mm. in breadth. The most frequent size is -021 ><*018 mm. 
The cirrus-pouch is comparatively large and lies towards thè left side. It 
extends forwards nearly to thè middle of thè body. It contains a well marked 
pars prostatica. The vesicula seminalis is rather small. The genital aperture is 
median and situated • 15 mm. from thè posterior and of thè body. The only host 
of this species is Gobius jozo and its habitat is thè terminal part of thè intestine 
(Stossich; Trieste). 
The chief distinctive feature of thè species is thè position and arrangement of 
tlie yolk glands, wliicli in most Gasterostomata are disposed along thè margins 
of thè body. Otherwise its structure is very typical. 
Napoli R. Stabilimento tipografico Francesco Giannini & Figli 
