608 
teeth were not all distinetly visible; for this reason only the dorsal 
tooth and a lateral one are drawn. 
Fig. 4. 
Fig. 4. The mouth-cavity and the corpus pharyngis of a female larva, 
viewed from before. The dorsal side lies at the top of the figure. Note 
the teeth on the three pharyngeal sectors. The letters a—e of figs. 3 and 4 corre- 
spond. Catch Scl. 88. >X 250. 
The bulbus pharyngis follows after the corpus pharyngis; its lumen is 
also strongly narrowed and tri-radiate in transverse section. The nerve- 
ring surrounds the bulbus. In the preparations, rendered transparent 
in glycerin or creosote no distinct limit is visible between the nerve- 
ring and the muscles of the body-wall. To the left and to the right 
between the bulbus and these muscles the first two lateral cells 
(Martini 1916, p. 367) are to be found. At its posterior extremity 
the bulbus pharyngis possesses three valves, protruding into the wide 
lumen of the intestine. An oesophagus, composed of some cells in 
the adult Ovyuris, according to Martini, is not visible in our total 
preparations, as they are only rendered transparent and not stained. 
Gonads are not visible in the larva, according to RaArmmer and 
Henry. In our younger specimens they are not distinguishable either, 
