I9I4-] ^- H. vStewart : Free-Liviiig Nematodes. 249 



Cobb's Formula — & 



(PI. xxxi. figs. II — 14.) 



Indian Museum, No. ZEV . 6142/7. 



xvlanikpatna, outer channel of Chilka Lake, on the i6th of 

 September 1903, from algae an an oyster shell. A single male 

 specimen, mounted in glycerine jelly-formalin. 



Head rounded. Diameter of the body increases in the first 

 0'34 mm. of the length to 0"0703 mm., thereafter increases very 

 gradually to 0088 mm. at a distance of 0185 mm. from the tail. 

 The tail is curved ventrally. 



lyips none. Papillae none. The mouth is surrounded by a 

 membranous ring. A cap of yellow cuticular substance lies under 

 the cuticle of the head, the base of the cap reaching to a distance 

 of 0'022 mm. from the anterior extremity. The cap when seen in 

 optical section presents the appearance of distinct skeletal pieces. 

 A circle of very scant (4) short and stout hairs surrounds the head. 

 Lateral organs are present — spherical capsules opening by an oval 

 pore to the exterior; breadth of the capsule 00074 mm. (The 

 lateral organs are described by Bastian as the apertures of the 

 excretory glands.) Buccal cavity not present. 



No rings or markings of the cuticle. No hairs except around 

 the mouth. 



Tail rounded obtuse. Anus slightly prominent. A papilla 

 situated in the midline o 071 mm. before the anus. No caudal 

 bristles. Oblique muscles in front of the anus as in Dorylaimus 

 Three tubular caudal glands opening at the posterior extremity. 

 The duct of the caudal glands, while traversing the substance of 

 the cuticle, is dilated to form a peculiar biscuit-shaped ampulla. 



Alimentary System. — The oesophagus is of uniform breadth 

 throughout the greater portion of its length. It measures 0'022 

 mm. until within 0*29 mm. from the posterior extremity of the 

 organ. At this level it commences to expand slightly and reaches 

 a maximum of 0*033 mm. 



The oesophagus is not divided into sections nor dilated to 

 form bulbs : colour of a dull yellow ; not markedly muscular. A 

 nipple-like appendage of the oesophagus projects into the com- 

 mencement of the lumen of the intestine. 



Intestine of the usual form ; it does not exhibit tesselation 

 on the outer surface, which is rough and irregular in appearance. 

 Rectum not observed. 



Nervous System. — Nerve ring o"02 mm. in breadth, distant 

 0*289 mm. from the head. Cellular collar commences 0-05 mm. 



