248 Records of the Indian Museum. [Vol. X, 



gradually in the posterior quarter to form a filiform tail. (PI, xxx, 

 figs. 8 and 9.) 



The head bears a low collar of delicate mobile membrane 

 around the mouth. No papillae or bristles. Lateral organs dis- 

 tinct, circular, 0*0038 mm. in diameter; distance of the organs 

 from the head equal to the breadth of the cephalic cone (o"0053 

 mm.). Oral cavity oval, enclosed between the collar and the 

 anterior end of the oesophagus. 



The cuticle bears no rings, marks, or hairs, with the exception 

 of one flagellum on the extremity of the tail. 



Lateral lines not distinguishable from muscle fields in pre- 

 parations of the entire animal. 



The tail decreases gradually in diameter from the level of the 

 anus; conical in shape. No bristles, glands, or papillae, with the 

 exception of the single terminal flagellum. 



Oesophagus simply club-shaped. No bulbs, division, or de- 

 finite colouration; no appendix. Intestine as in the genus; no 

 sign of cellular division; charged with black granules superficially. 

 Rectum short. 



Nerve ring not observed. No ocelli. 



No ventral gland. 



Testis commences 0"0I7 mm. behind the end of the oesophagus 

 and lies on the right side of the intestine. A prostate like mass 

 present at the junction of the testis and vas deferens. Vas 

 deferens opens immediately in front of the anus through a small 

 almond-shaped body. Two spicules in the wall of the rectum, 

 long, thin, simply curved. Ovary in anterior extremity 0102 mm. 

 distant from head ; ovary and uterus single Uterus short, saus- 

 age-shaped, 0064 mm. in length, contains spermatozoa only. 



The immature specimen (PI. xxxi, fig. 10) measures 0'357 mm. 

 in length, possesses a distinct tubular buccal cavity with fine 

 chitinous walls and a pointed anterior extremity, which is per- 

 forated for the mouth. Oesophagus clothed with a cellular coat. 

 An oval hyaline mass situated posterior to the oesophagus repre- 

 sents the gonads. The intestine is composed of loose fibrillar tissue 

 with some black granules. 



The species is most closely allied to Monhystera dispar, Bast., 

 in that it bears no ocelli, possesses a gut with black granules, a 

 smooth unringed cuticle ; lateral organs not spiral ; distance of 

 lateral organ from head equal to breadth of head ; distance of 

 vulva to anus greater than anus to tail. It differs from M. dispar 

 in the following points : — Total length in M. dispar 072 — I'l mm. ; 



in M. uria 0-54 mm, ; ^^e^h"""^" ^^' ^^^^^^ 4^5— 5-5 ^^^ ^' ^^^^ 



— ^i .^.^11 Tu • — ii^ ^^- dispar ^ — in M. uria — . Six oral hairs 



5"8 ' total length ^ 0—7 5'25 



in M. dispar, none in M. uria. '[Short filiform caudal appendage 

 in M. icria, none in M. dispar. Males more frequent in M. uria, 

 unknown in M. dispar. 



