436 



SANGU1FEROUS SYSTEM. 



annexed view, from Nordmann, of the internal structure of 

 the diplozoon paradoxum, (Fig. 132.) which is frequently 

 found attached between the inner laminse of the gills of the 

 bream, (cyprinus brama), the circulation is observed to be 

 conducted in distinct arteries and veins, without the aid of 

 pulsating cavities or vessels, as in other species of this order ; 

 and not only is the same plan of the sanguiferous system 

 repeated in the two halves of the animal, but also on the two 

 sides of each half of the body. The two halves of this tre- 

 matode entozoon communicate freely by the digestive canal, 



FIG. 132. 



and have each a distinct genital apparatus, as we see also in 

 the several segments of the tania and other cestoid forms, 

 and dicephalous individuals are occasionally found in the 

 tricenophori and cysticerci, as abnormal forms. At the ante- 

 rior extremity of each of the long free tapering divisions of 

 the body is seen the transverse crescentic buccal orifice (132. 

 #,) of the digestive organs, (132. e. d. c. r.) with two lateral 

 suctorial disks, (132. /*,) and a salivary follicle (132. /.) ; and 



