170 



ZOOLOGY. 



while the male is unknown. The worm lives in the con- 

 nective tissue under the skin, especially of the extremities. 

 As the body of the female is full of young, the worm has to 

 be carefully and slowly extricated, so as not to be broken and 

 cause the embryos to be scattered under the skin of the host. 

 Cai'ter regards a small worm ( Urolabes palustris) frequent in 

 brackish water, as the immature form of the Guinea-worm. 

 It is also believed that the embryos enter the bodies of water- 

 iieas (Cyclops, etc.), and there moult, and that consequently 

 they may be introduced into the body by drinking standing- 

 water ; but this has not been proved. Other species live in the 

 peritoneum of the horse and ajies, and an immature species- 

 {Filaria lentis) has been found in the lens of the human 

 eye. Filaria sanyuiiiis-lwniinis is a worm of microscopie 

 size found living in the blood of the mosquito in India and 

 China. It is said that the eggs are swallowed in the water 

 drunk by man, are hatched in his intestines, and obstruct 

 the smaller blood-vessels, causing, it is claimed, various 

 forms of elcpliantoid disease, perhaj^s even lej)rosy. The 

 mosquito sucks ujd the parasite iu the blood of leprous j)a- 

 tients, voiding the eggs in the pools it frequents. Filaria 

 hmnatim has occurred iu the blood of the foetus of a dog 

 whose heart was tilled with them. Ears of M-hcut are 

 often infested by a mimito Xematode {Tylenchns scandens 



Schneider, Angvil- 

 hda tritici of Xeed- 

 ham, Fig. 118). 

 Other species live iu 

 flowei-s, moist earth, 

 aud sour decaying 

 substances. AnyuiJ- 

 hda aceti Elireu- 

 berg is from one to 

 two millimetres in 

 length, and lives in 

 vinegar. 



The genus Chmto- 

 soma lives free iu 

 the sea, and has a broad swollen head beset with fine haii-s. 

 It apparently connects the ti-uc Nematodes with Sar/itta. 



Fig. 118.— Tmmg Wlioat Worm, greatlj- magnified, 

 a, section of "chi'iit'' exliiliiling some worms and molti- 

 tndes of eggs, magnified ; b. an egg contamiug a worm 

 ready to batch.- From Curtis, after Bauer. 



