100 ANIMAL PARASITES. 



lips, and two setiform maxillse in its interior, and thin five- 

 pointed palpi either hanging down or bent ; the latter are dis- 

 tinguished by their prominent eleven-jointed antennae, becoming 

 thinner at the apex, and have a projecting proboscis, broad wings, 

 and no ocelli. As, however, they are in general too well known, and 

 only attack men for a time in order to obtain their nourishment, 

 we shall not pay further attention to them in detail, but here- 

 with close our examination of the parasites occurring on the 

 human subject. 1 



Amongst the parasites belonging to the class of Helmintha 

 the reader will miss 1, the Dactylius aculeatus, and 2, the 

 Spiroptera hominis from the urine. The former was placed by 

 Von Siebold with the Naides, and by Henle with his new genus 

 Enchytraeus ; it is undoubtedly only an animal of the family of 

 the Lumbricini which had got accidentally into the urine. 2 (See 

 Von Siebold, 1. c.) The latter, according to Bremser, was a 

 young Strongylus gigas. 3. The Dicer as rude = Ditrachyceras 

 rudis, recognised as the seed of the white mulberry. 4. Diacan- 

 thus polycephalus, as a raisin- stalk evacuated per anum. 5. Sagit- 

 tula hominis, as a fragment of the hyoid bone of some bird 

 passed with the fseces. 6. The Ascaris alata, found in the small 

 intestine of a man, is probably only a young individual of one of 

 the long-known Nematoda, if indeed it be a worm at all. 7. 

 Bushnan's worms, which were found in the blood an hour after 

 bleeding, were the larvae of Tipula oleracea, according to Rhind, 

 and accidentally introduced: red larvse of Chironomus, according 

 to Von Siebold. 8. The Filaria hominis bronchialis of Treutler, 

 as already observed, may be identical with the Strongylus longe- 

 vaginatus of Jorsits (Diesing). 9. The Hexathyridium venarum 

 of Treutler and Delle Chiaje was probably Pisciola geometra, or 

 some other planarian inhabitant of the fresh water, which had 

 got into the vessels with the water employed in bathing the feet, 

 &c. 10. The Polystoma pinguicola, Zeder = Hexathyridium 

 pinguicola t Treutler, an animal 8'" long, 2 3"' in thickness, 

 oval, convex above, impressed beneath, furnished with six pores 



1 See Appendix A. 



2 The history of these animals is given in Appendix C, vol. i. TRANS. 



