SYSTEMATIC 

 AREANGEMENT OF ENTOZOA. 



CLASS V. 

 ENTOZOA. 



ANIMALS mostly elongate, without peculiar organs of respira- 

 tion, parasitic, occurring in various internal parts of other living 

 animals, sometimes destitute of nervous system, or having a nervous 

 ring surrounding the mouth and a single ventral or double lateral 

 cord. 



ORDER I. Sterelmintha s. Parenchymatosa. 



Intestinal canal wanting in some, vascular in others, surrounded 

 by the parenchyme of the body. 



Family I. Cesto'idea. Body elongate, depressed, soft, conti- 

 nuous or articulate. Mouth none; head usually furnished with 

 fossettes or suctorial oscules. All the individuals hermaphrodite. 



GaryophyllcBus GMEL., Caryophyllus BLOCK. Body continuous 

 (not divided into segments), depressed, with head dilate, lobate or 

 laciniate, mutable. 



Sp. Caryoph. muiabiUs HUD., Entozoor. Hist. not. Tab. vin. figs. 16 18, 

 BREMSER, Icon. Helminth. Tab. xi. figs, i 8 ; this species lives in fresh- 

 water fishes (Cyprinus, Cobitis). Caryopkyllceus is distinguished from the 

 rest of the tape- worms by the occurrence of the genital organs only once, 

 whilst in the rest, on the contrary, they occur repeatedly behind each other 

 in the length of the body. 



Ligula BLOCK. Body continuous, depressed, extremely long, 

 in the imperfect state with neither head nor genitals conspicuous, 

 with a median or two lateral furrows running lengthwise ; in the 



