4)10 ENTOZOA. ELMINTHAPROCTA. 



broken off or displaced in the body that this segment became a complete worm. It is 

 now, however, ascertained that when this is the case, the portions are expelled ; bui 



It is 

 but 



that, if a living head be attached to one or more segments, the animal grows to its 

 usual size by the addition of new joints. It is worthy of remark, that the stomach and 

 intestines of no animal seems to have the power of digesting the Tcenia or its frag- 

 ments, either living or dead ; although their substance appears to be of a nature which 

 would readily be dissolved by the gastric apparatus. The domestic animals are 

 equally subject to attacks of different species of Tcenia. Chabert found two hun- 

 dred and twenty-seven in a dog ; a hundred and eighty-one in a horse ; and twelve 

 in a sheep. 



TRIBE I. ANTHOSTOMA. 

 With four trunks or projecting and retractile suckers. 



I. Trunk spinous. 



Gen. TETRARHYNCUS (Tentacular ia. Lam.) ; RIIYNCHOBOTHRIS (Botrioce- 

 phali proboscidei, Rud.) 



II. Suckers or trunks naked or without spines. 



Gen. TETRABOTHRIS, (Botriocephalitetrdbothrii, Rud.) ; GYMNORHYHCUS, 

 Rudolphi. 



TRIBE II. STEPHANOSTOMA. 



With but one trunk, and the lateral suckers slightly or not at 

 all projecting. 



I. Four osculi or suckers. 



Gen. SCOLEX, T^NIA. 



II. Two osculi, or two three-pointed spines. 



Gen. BOTRIOCEPHALUS, (B. dibothrii, Rudolph.) ; TRICUSPIDARIA, (Trice, 

 nophorus, Rud.) LIGULA. 



FAMILY III. CYSTICA, Rudolphi. 



Animals inclosed in a cyst, sometimes solitary, sometimes in 

 society, and even in many groups ; body either almost entire- 

 ly or posteriorly vesicular ; no ovaries. 



The worms of this family, generally known by the name of Hydatids, are often 

 found in the bodies of other animals ; and till the investigations of Rudolphi and 

 others their nature was but imperfectly understood, as being organized animals or 

 tumours arising from disease. Some species multiply to a great extent in quadru- 

 peds, particularly the Ruminantia ; and one species is well known as particularly 

 infesting swine, penetrating even the heart and eyes. 



TRIBE I. MONOBIA 

 Cyst inclosing but one animal. 



Gen. FLORICEPS, (Anthocephalus, Rudolphi); CYSTICERCUS, (Hydatis, 

 Hydatigera, Lam.) 



TRIBE II. SYNBIA. 



Cyst inclosing many animals and often groups, and which they 

 are capable of leaving or entering. 



Gen. CCENURUS, ECHINOCOCCUS. 



The Ccenurus cerebralis, (Tcenia cercbralis, Gmel.) which is developed in the 

 brains of sheep, is known as the cause of a kind of paralysis which makes them turn 

 round involuntarily. It has been found also in oxen and other ruminating animals, 

 where it produces the same effects. The sac is sometimes as large as an egg. The 

 worms are about half a line long. 



