Tlie family Koellikeriadae. 147 



K. (D.) exocoeti Parona et Peeugia. 



This paper is also inaccessible but the form is the same as 

 Monostomum filum Düj. and lives in the liver and in the eye of 

 Exocoetus exüiens. It possesses a long- thread-like body attached to 

 the cyst wall, a mouth sucker and pharj-nx. 



K. (D.) henedenü Monticelli. 



A new and interesting species ot Didymosoon found on the gills 

 of Orihagoriscus probably same as that found b}' van Beneden but 

 given this name. Nothing can be determined of the nature of this 

 worm, especially since Maclaren who thought it identical with his 

 properly described Nematohothrium molae was persuaded by Monti- 

 celli that it was a diiferent worm. At any rate it is probably a 

 Nematohothrium. 



K. {D.) ßicolle RuD., 1819. van Beneden, 1858. 



Syn. for Distomum fiUcoJle van Beneden, Monost. fdicolle Rud., 

 D. oJcenii Köll., 1849, Köllikeria fllicolle. 



Two diflferent individuals in each cyst in the gills of Bratna 

 raja. The sac is not really a cyst as it opens into the branchial 

 cavity. One individual is füll of eggs, the other thin and delicate. 

 The anterior part of body is narrow, slightly swollen anteriorly. 

 Rest of body very large and rolls on itself. Buccal and abdominal 

 suckers easily recognized. Intestine bifurcated — between the coeca 

 a canal which opens behind the buccal bulb, This is the Uterus 

 partly filled with eggs and convoluted in posterior part of bod}-. 

 There are other tubes not yellow but milk white all belonging to 

 the female apparatus. The other individual is like this in the 

 anterior part but the body narrows behind and is elongated. There 

 is a long tube beside the intestine but no eggs. Probably the male 

 Organs atrophy in one, the female in the other. Wagener has seen 

 spermatozoa and eggs in the same individual and two of this kind 

 in a cyst. There are worms which are more or less female or more 

 or less male (van Beneden). 



K. (B.) tenuicolle Rudolphi, 1819. 



Syn. Monost. tenuicolle Rud. Bist, affine Dies. Dist. decorynum 

 Dies, and probably Bidymosoon lampridis Lönnberg. Worm encysted 



