1'.15 



]\Ir. W. II. Leigli-Sharpe on 



Tlie parasites reposed in tlie body-cavity of the worm, in 

 segments 10 and 11, all but one diploid being on the host's 

 right side. They appeared of an opaque china-wliite colour, 

 the largest (fig. 1, A) being 5 mm. in length, the others 

 4 mm. All were laterally bowed in sliaj)e, and curved round 

 the oesophagus of the worm between the calcit'erous glands 

 and the pouch, but attached by their anterior extremities to 

 the seminal funnels. Tlie worm had been killed an hour and 

 a half previous to dissection by immersion in methylated 

 alcohol, and none of the parasites showed any sign of life. 



It is remarkable that such a large number of parasites 

 should occur within one host, and curious that here we have 

 two individuals permanently associating as one, though not 

 conjugating. 



Fisr. 2. 



Moiiocystis Oijilis. Two conjiigiints in polar appositiou. 

 N., nucleus. 



' 'J'he unique presumed conjugation of Monocystis uiacpin, 

 Schmidt, has been described by Cu^not (1900) alone, who 

 gives a figure which, to my mind, is not as satisfactory as 

 might be, since it shows the supposed conjugants so clearly 

 as two separate individuals, instead of being apposed in such 

 a way as to look like one individual (fig. 1), the lines of 

 demarcation between thera superficially resembling the 

 alimentary canal of some single animal. The association in 

 this species alone was said to be longitudinal — a fact which 

 apj)ears to have been known at the earliest to Bosanquet 

 (1894), who mentions it casually in describing another 

 species, and even admits en jiassant into his paper a very 



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