248 Transactions of the 



the integument, Fig. 2 ; but uncompressed, they were too dense or 

 opaque to give a fair view of the structure, so that by compression 

 the outline of the figure is altered. The addition of acetic acid 

 rendered the opacity rather less, without any kind of effervescence. 

 Besides the parts of the ovarium, or may be vitelligene organ, a 

 considerable mass was seen much denser than the rest, and appa- 

 rently lobulated, though the compression that had been used might 

 have caused this. Near to it, and connected to a very thin tissue or 

 membrane (if such it may be termed, for it appeared to be composed 

 of almost transparent irregular non-nucleated little bodies held toge- 

 ther by some common adherence), was noticed a small well-defined 

 truncated tube, with two sharp spicules exserted for a short distance 

 beyond the open end, one of these spicules being continued back for 

 the entire length of the little tube ; this was supposed to be the 

 intromittent organ, Fig. 9. After long and patient search continued 

 through several days I was rewarded by finding the head of the 

 parasite ; it was however so opaque that it seemed very doubtful if 

 its particular features could be recognized, especially as the previous 

 compression had evidently displaced several of the parts of which it 

 consisted. The addition of acetic acid availed little, hence I decided 

 on trying to mount it in Canada balsam, by first dehydrating it with 

 chloroform followed by alcohol, then soaking in absolute alcohol, 

 draining the slide, covering the specimen with oil of cloves, and 

 finally with cold Canada balsam. This enabled me to obtain the view 

 given in Fig. 1, Plate XIX., x 85 diameters. This with what was 

 noticed previously to mounting, showed a double row of hooks and 

 hooklets. Three of the small ones seemed somewhat different in 

 shape and density, and besides these, four suckers were visible, though 

 their exact relationship and structure had been disturbed by the com- 

 pression used before finally mounting the specimen. A count of the 

 hooks and hooklets gave the number, including the four separate 

 hooks on the slides, as 12 large and 16 small, but as these m the 

 double-crowned taenia are generally, when perfect, alternate, it 

 would perhaps be more correct to fix the number of large ones as 

 equal to the small ones, giving thus 32 in all, though even here 

 it is very possible some of the small ones also may be missing. 



Besides the various points enumerated amongst the so-called 

 calcareous corpuscles which had been set free, some of which are 

 figured with their dense covering at 360 diameters in Fig. 10, is 

 one with the granular contents escaping under pressure; also a 

 peculiar delicate cell-like body, enclosing very pale, scarcely percep- 

 tible cells in the interior, which apparently was attached to one of 

 these ruptured corpuscles, which even appeared operculated or 

 perhaps broken at one point, and the delicate mass to have advanced 

 a stage towards some developmental condition, Fig. 11. The 

 corpuscles varied considerably in shape and size. Likewise were 



