16 INTRODUCTION. II. 



ECTOZOA HOMINIS. 



Plilhirius inguinalis, Leach. (Crab-louse.) 



Pediculus capitis, Nitzsch. (Head-louse.) 



Pediculus vestimenti, Nitzsch. (Body-louse.) 



Pediculus tabescentium, Burmeister. 



Sarcoptes scaliei, Latreille. (Itch-insect.) 



Demodex folliculorum, Owen. 



Dermanyssus Boryi, Gervais. 



Ixodes americanus, De Geer. (Tick.) 



Argas persicus, Fischer. 



Pulex irrilans, Lin. (Common flea.) 



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



Cimex lectularius, Lin. (Bed-bug.) 



Oestrus hominis, Say. South America. 



ENTOPHYTA HOMINIS. 



Alga of the mouth. 



Achorion Schonleinii, Remak. In porrigo favosa. 



Achorion Lebertii, 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 1 Stomach. 



' * I once saw a plant of this kind in great abundance mingled with the Sarcina ventriculi in the liquid 

 ejected from the stomach of a man. 



