THE NEMATODE FAMILY GNATHOSTOMIDJE. 



295 



The diameter of the oesophagus immediately beliind the bead 

 is 0*125 mm.; its widest diameter is 0*6 mm. and lies at about 

 0'6 mm. from its termination. 



The cervical papillae (PI. YII. figs. 30, 31) are coarse, rounded 

 knobs with their terminations directed posteriorly, each lying in 

 a small bald area among the spines. 



In the male the four large caudal papillae on each side (PI. YIL 

 fig. 32 ; PI. YIIL fig. 33) lie close together in the caudal alae. 

 No. 1 is the smallest, the others being all of about the same size 

 but varying in i-elative proportions according to the aspect from 



Text-figure 40. 



^natliostoma spinigervm. Body-spiiies : a, from the neck, immediately behind 

 the head-bulb; h, from the (esophageal region; c. from behind the 

 oesophagus (about 4 mm. from the anterior end) ; d, from about the middle 

 of the l)ody. 



which they are viewed. Their nerves are particularly large and 

 obvious- Near the bases of Nos. 1 and 2 of these papillje lie the 

 two pairs of small ventral papillae. The cloacal opening lies in 

 front of these. 



On the greater part of the posterior 0*8 mm. of the ventral 

 surface of tlie caudal extremity the cuticula.r stria? are closely set 

 with small spines (PI. YIL fig. 32 ; PI. YIII. fig. 33), the general 



