16 INTRODUCTION. H. 



ECTOZOA HOMINIS. 



Phlhirius inguinalis. Leach. (Crab-louse.) 



Pediculus capitis, Nitzsch. (Head-louse.) 



Pediculus vestimenti, Nitzsch. (Body-louse.) 



Pediculus tabesceniium, Burmeister. 



Sarcopies scabiei, Latreille. (Itch-insect.) 



Demodex folliculorum, Owen. 



Dermanyssus Boryi, Gervais. 



Ixodes americanus, De Geer. (Tick.) 



Argas persicus, Fischer. 



Pulex irritans, Lin. (Common flea.) 



Pulex penetrans, Gmelin. (Chiggo.) South America. 



Cimex lectularius, Lin. (Bed-bug.) 



Oestrus liominis, Say. South America. 



ENTOPHYTA HOMINIS. 



Alga of the mouth. 



Aeliorion ScTiiinleinii, Remak. In porrigo favosa. 



Achorion Leberiii, Robin. In porrigo scutulata. 



Microsporium Audouini, Gruby. In porrigo decalvans. 



Mycoderm of Plica Polonica. 



Mycoderm of Mentagra. 



Mycoderm of Muguet. 



Mycodermata of ulcerated and mucous surfaces. 



Sarcina ventriculi, Goodsir. Stomach. 



Torulaf^ Stomach. 



^ I once saw a plant of this kind in great abundance mingled with the Sarcina ventricnii in the liquid 

 ejected from the stomach of a man. 



