394 



ENTOZOA. 



comprising only two separate species, wMcli possess, however, 

 very considerable interest alike for the naturalist and the 

 pathologist. 



1. Pentastoma t^nioides. 



P. tcBnioides, Eud.olphi ; Bremser ; Diesing ; etc. 



P. denticulatum, Eudolphi ; Bremser ; etc. 



F. serratum, Eudolphi ; Diesing ; Miram ; Dujardin. 



P. emarginatwm, Eudolphi. 



P. settenii, Diesing. 



P. zera, Orephn. 



Linguatula toenioides, Lamarck ; Cuvier ; Owen ; etc. 



L. lanceolata, Blainville. 



L. denticulata, Lamarck. 



L. serrata, Froelich. 



L. ferox, Kiichenmeister. 



Poly stoma tmnioides, Eudolphi. 



P. denticulatum, Eudolphi. 



P. serrata, Zeder ; Eudolphi. 



Tetragulus cavice, Bosc ; Kaufman. 



Prionoderma lanceolata, Cuvier. 



Echinorhynchus caproi, Braun. 



Tcenia lanceolata, Chaubert. 



T. rhinaria, Pilger ; Greve. 



T. caprina, Abildgaard ; Glmelin. 



Halysis caprina, Zeder. 



Monostoma settenii, Numan ; Siebold. 



General and Specific Characters. — Aji entozoon belonging to the family of Aoaridse, 

 and having no structural connection witli the true helminths ; in the adult state charac- 

 terized by the possession of a vermiform, lancet-shaped body, flattened at the ventral 

 surface, attenuated posteriorly, and marked transversely by about ninety rings ; cephalo- 

 thoracie segments continuous mth the body, supporting each a pair of strong retractile 

 chitinous claws, these four feet or limbs being biserially disposed on either side of the 

 middle line ; head somewhat truncated or abruptly rounded, mouth broadly oval and 

 armed with a homy Up ; integuments perforated with num.erous so-caUed respiratory 

 openings or stigmata, which are, however, wanting in the cephalic segment : general 



