96 ANIMAL PAEASITES. 



" Parasiten," in Rudolf Wagner's ' Handvvorterbuch der Physio- 

 logic/ ii, p. 683, note 1, and 684, note 2. It appears only to be 

 possible for these animals to reach the human intestine indirectly, 

 and indeed by the use of vegetables which have stood for some 

 time, and to which the female Anthomyice could have access. 

 As vegetables of this kind, Von Siebold particularly refers to 

 cabbages ; I think any farinaceous food which has been kept and 

 which is eaten cold is sufficient for the purpose. The eggs of 

 Anthom. (Hyalemyia) canicularis measure \" , and are uniformly 

 rounded at both poles. The dorsal surface is even covered with 

 two parallel folds bent inwards, which suddenly cease at the end 

 with an obtuse angle. The ventral surface with hexagonal facets 

 and punctures. The inner surface of the dorsal folds and of the 

 back exhibits broad, rafter-like elevations, by which the facets are 

 rendered smaller ; it is also punctured. The micropyle is situated 

 upon a large smooth space at the anterior pole without any dis- 

 tinctive mark (mouth-piece, points, or the like). In the true 

 Anthomyia the pores have become real pits, and the transverse 

 ridges between the facets are tubercular. The micropyle is 

 funnel-shaped. The larva probably escapes at the anterior pole, 

 on which a blunt process is sometimes found. 



2. Creophila = Flesh-Flies. 



Corpus compactum, abdomen rotundum, thorax latus, caput 

 transversum squamae (= alulets) halteribus majores. Nonnulla 

 vivipara. Injuventute (statu larvali] parasita. 



a. The great Bluebottle = Musca vomitoria = M. erythrocephala 



(Aut. recent). 



Leuckart describes the eggs of this fly as follows : Eggs tole- 

 rably compressed, V". long, uniformly truncated at both ends; 

 upon the very flat dorsal surface a white stripe (a peculiar apparatus 

 of longitudinal ridges, a duplicature of the chorion) extending 

 from one pole to the other, or even a little beyond the superior 

 pole. The delicate, pale, limpid vitelline membrane, which 

 folds readily, may be easily separated from the brittle chorion, 

 which is beset with delicate, hexagonal facets, ^" in diameter, 

 with small, close points, which are rather pits or pores than ele- 

 vations. The little points may be very distinctly recognised as pits 



