SEA-FISHERIES LABORATORY. 323 



The ventral sucker is spherical and is rather less in 

 diameter than the mouth; it projects considerably from 

 the general line of the body. The testes are large, oval 

 bodies situated far back, near the pointed posterior end 

 of the worm; the ovary is smaller than the testes, is 

 oval in shape and is situated at about the posterior third 

 of the body. The uterus is very voluminous, is crowded 

 with ova, and obscures greatly the relationship of the 

 vitellaria and their ducts. The latter glands are situated 

 on either side of the body as two broad bands of glands, 

 the edges of which bands are turned towards the observer 

 in the view presented. At the posterior extremity are 

 two small, clear vesicles, which are doubtless dilatations 

 of the excretory duct or ducts. 



All the body is covered very densely with small, 

 straight spines ; these are represented in fig. 23 A, which 

 shows the mouth, coronet, and the beginning of the 

 oesophagus. 



Molin's species appears to be smaller than those 

 which I have described, but I have no hesitation in 

 regarding the Piel specimens as identical with the worm 

 described by him. 



III.— FUNGI. 



I describe here an entomophthoran fungus, which 

 is apparently situated near to the genus Conidioholus, 

 but the exact identity of which is in the circumstances 

 indeterminable. This organism occurred in the viscera : 

 the liver, kidney, and mesenteries of plaice (Pleuronectes 

 platessa) living in the open-air spawning pond at the Port 

 Erin Biological Station, and has been associated with a 

 serious mortality among these fishes. The description and 

 figures of this fungus given here are based on the 



