SYSTEMATIC 
ARRANGEMENT 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. 
Orper I. Sterelmintha s. Parenchymatosa. 
Intestinal canal wanting in some, vascular in others, surrounded 
by the parenchyme of the body. 
Family I. Cestoidea. Body elongate, depressed, soft, conti- 
nuous or articulate. Mouth none; head usually furnished with 
fossettes or suctorial oscules. All the individuals hermaphrodite. 
Caryophylleus GMEL., Caryophyllus Buocu. Body continuous 
(not divided into segments), depressed, with head dilate, lobate or 
laciniate, mutable. 
Sp. Caryoph. mutabilis Rup., Entozoor, Hist. nat. Tab, vit. figs. 16—18, 
BremseER, Jcon. Helminth. Tab. x1. figs. 1—8 ; this species lives in fresh- 
water fishes (Cyprinus, Cobitis). Caryophylleus 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 Buocu. 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 
