C. L. Boulenger 343 
viewed from tlie dorsal or ventral surface (Text-fig. IB), they are usually 
better developed in the females than in the males. 
Submedian head-papillae small, lateral papillae very inconspicuous. 
The anterior region of the oesophagus measures 0*6-0*85 mm. in length, 
whilst the posterior region has a length of 6*5-7*3 mm. 
Male: 40-46mm. in length with a maximum thickness of about 0*6mm. 
The tail region is coiled in a close spiral, the cloaca situated 0*19-0*23mm. 
from the posterior extremity. The latter is provided with a rounded terminal 
Fig. 1. Setaria labiato-papillosa (Aless.). A. Head in lateral view. B. Head in dorsal 
view. C. Lateral view of caudal extremity of female, x 220. 
knob close in front of which are situated a pair of conspicuous lateral appen¬ 
dices (Text-fig. 2). There are four pairs of preanal and four pairs of post- 
anal papillae. 
The spicules are very unequal, the larger measuring 0*33-0*37 mm. in 
length and consisting of a long cylindrical anterior region followed by a much 
shorter terminal region which is largely membranous. The shorter spicule 
(Text-fig. 2) is stout, slightly curved and terminates in a sharp point. 
Female: 62-94 mm. in length, with a maximum breadth of 0*7-0*8mm. 
The caudal region is coiled in a loose spiral and terminates in a knob-like 
extremity surrounded by an irregular ring of pointed spines, the latter very 
