552 
ENTOZOA. 
of equal thickness; greatly elongated; mouth orbicular; simple 
organs of generation. 
Filaria medinensis. — The Guinea Worm. 
Plate CII. fig. 8. 
Animal extremely long ; the head attenuated; the tail some¬ 
what subulate and indexed. 
Filaria sub-compressa. — The Sub-Compressed Humularia. 
Plate CII. fig. 9. Fig. 10. head of do- magnified- 
Oblong, round, compressed on both sides; dark-brown, and 
studded with black spots, tapering towards the anterior extremi¬ 
ty; head obtuse, and furnished with two hooks. Found in the 
human body. 
/ 
Genus T RIC H O CE P HA L US. —Rudolphi. 
Generic Character.— Body long, elastic, the anterior part with 
a capillary, filamentary, elongation, and gradually thickening to¬ 
wards the posterior extremity; mouth orbicular; organs of gene¬ 
ration simple •, having a sheath in the female. 
Trichocephalus dispar. — The Long Thread Worm. 
Plate CII. fig. 13. male. Plate CIII. fig. 1. female. 
Anterior part small and capillary, terminating in an acute 
point, in which the mouth is situated; the posterior part swells 
out to a considerable size, and in the male is spiral and provided 
with a funnel-shaped tube. Inhabits the human body. 
Genus OXYURUS.— Bremser. 
Generic Character. —Body long, elastic; the anterior part of 
tlje female subulate; mouth orbicular; organs of generation 
vaginated. 
Oxyurus vermicularis. — The Maw or Thread Worm. 
Plate CII. fig. 4. male, natural size; fig. 3. magnified ; fig. 2. female, natural 
size ; fig. 1. magnified. 
Head obtuse, and the body gradually thickening towards the 
tail; the female is subulate towards the tail. Inhabits the hu¬ 
man body. 
