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and transparent, and when viewed with the microscope are seen to 

 be rauscular, both longitudinal and circular fibres being distinctly 

 visible. They consist of the non-striated variety of muscular fibre 

 (PI. XLVII. fig. 14). The fuUy developed ova are not attached to 

 the parietės of the uterus by any connecting cellular substance, for 

 ou being cut across, the ova immediately flow out, and the parietės 

 collapse. On the other hand, the imperfectly developed ova found 

 in the upper portion of the uterus have a darker colour, and seem to 

 be adherent by a glutinous material not only to each other, but also 

 to the vyalls of the organ. 



At the upper point of its attachment to the abdominal parietės 

 are two oblong bodies of a dull vvhite colour (PI. XLVI. fig. -i,/ f). 

 These bodies open directly into the uterus. On examination they 

 were found to be filled with spermatozoa in all the various stages of 

 development, from the primitive granule up to the perfectly formed 

 spermatic filament (PI. XLVII. fig. 8). The filaments are of con- 

 siderable length, and are amassed together in bundles of tolerable 

 size (PI. XLVII. fig. 8, a), Some of the fully formed spermatozoa 

 with large heads measured -į^ mm. in length, and a few were even 

 longer still. 



A ąuestion of great interest and iraportance might be here raised 

 regarding the special function of these oblong bodies, which, as I 

 have just mentioned, contain innumerable spermatozoa in various 

 stages of development. Are they the spermatheca or copulatory 

 pouches of a female ; or are they to be regarded as the testieles or 

 malė organs of generation of a hermaphrodite ? I shall defer the 

 consideration of this important point until after I have terminated 

 the deseription of the animal. 



The organs just alluded to, which, for the sake of brevity, I shall 

 speak of as testieles, are attached to the parietės of the entozoon 

 by strong bands of striated muscular fibres. At the upper part of 

 their point of union, the uterus divides into two fallopian tubes, 

 vvhich gracefully curve round the digestive canal, pass behind the 

 tv?o great nerve cords, and after getting between them, reunite to 

 form the ovary (PI. XLVI. fig. A, g y). The ovary is of a ferru- 

 ginous colour, intimately attached in the mesial line to the dorsal 

 aspect of the animal, and coutinued downwards between the nerve 

 cords and behind the alimentary canal to within about .5 lines from 

 the anus, where it suddenly termhiates in a blind sac. 



When viewed through a lens, the coats of the ovary are seen to 

 be thin and transparent, and not closely surrouuding their contents. 

 They are here and there thrown into loose folds, and the ova can be 

 distinctly observed in their interior, likę a series of bunches of grapes 

 closely strung together (PI. XLVI. fig. 5). When the ova are highly 

 magnified, they are recognized to be spherical bodies attached to- 

 gether by little peduncles, and to consist of a tunic or yelk-sac, a gra- 

 nular yelk and a germinal vesicle. I even detected in many of them 

 the germinal spot (PI. XLVI. fig. 6rf.). 



On tracing the development of the ova, I found that the germinal 

 spot disappeąred from them as soon as they had passed out of the 



