DESCRIPTION OF PLATES. 



FROKTISPIECB. 



This plate represents two different examples of a large fluke {Fasciola gigantea, 

 Cobbold) taken from the biliary ducts of the liver of a giraffe (x 2f diam.). 



The specimen to the left has the anterior surface exposed, so as to display 

 the oral and ventral suckers, and, more particularly, the dendriform digestive 

 apparatus which has been injected from the mouth by artificially prepared ultra- 

 marine. 



The figure to the right exhibits the dorsal aspect of the other specimen, show- 

 ing, more especially, the multi-ramose character of the water- vascular system, the 

 vessels of which have been distended with vermilion. 



The direction of the primary branches of the two canal-systems forms a 

 complete contrast. 



The original preparations and drawings from which these figures have been 

 taken, are in the author's possession. — T. S. C. 



PLATE II. 



FIG. 



1. Eight examples of a small fluke (Distoma conjunctum, Cobbold) obtained 



from the liver of an American red fox (Oanis fulvus) ; the central pair 

 being sexually united. Natural size, 



2. One of the same, coloured to render the parts more distinct (x 36 diam.) ; a, 



oral sucker ; b, acetabulum ; c, oesophageal bulb ; d, d, digestive canals ; e, 

 reproductive papilla ; f, commencement of the uterus ; y, ovary, with two 

 excretory ducts coming from the vitcUigene, or yelk-forming glands ; li, h, 

 primary branches from the main trunk of the water- vascular system ; ^, i, 

 the vitelligenes ; Jc, 1c, testes ; I, contractile vesicle. 



3. Group of ova. Slightly magnified. 



4. Three of the same, showing the opercula, segmented yelks, and granular 



contents escaping from the lowermost specimen (x 150 diam.). 

 6. Mass of glittering corpuscles from the intei-ior of the contractile vesicle 

 (x 250 diam.). 



The above figures are from original sources. — T. S. C. 



