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

 be muscular, both longitudinal and circular fibres being distinctly 

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

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

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

 on being cut across, the ova immediately flow out, and the parietes 

 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 walls of the organ. 



At the upper point of its attachment to the abdominal parietes 

 are two oblong bodies of a dull white colour (PI. XLVI. fig. 4,//). 

 These bodies open directly into tbe 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 (PL 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 ^ mm. in length, and a few were even 

 longer still. 



A. question of great interest and importance 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 testicles or 

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

 consideration of this important point until after I have terminated 

 the description of the animal. 



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

 speak of as testicles, are attached to the parietes 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, 

 which gracefully curve round the digestive canal, pass behind the 

 two great nerve cords, and after getting between them, reunite to 

 form the ovary (PL XLVI. fig. 4, gg). The ovary is of a ferru- 

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

 aspect of the animal, and continued downwards between the nerve 

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

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



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

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

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

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

 closely strung together (PL 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 (PL XLVI. fig. 6d.). 



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

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



