370 Mr Cobb, On Free-living fresh-water 



millimetre long, and are half as wide as long. The ovaries are 

 reflexed. 



2- 5-5 20- M 50 85-5 nc ^ ,_ 



o"5 to 7* mm. 



1-5 19 21 2-3 1-5 



The tail of the male is shaped like that of his mate. In front 

 of the anus it is armed with a ventral row of seventeen prominent 

 papillae, extending forward from the anus a distance equal to half 

 the length of the tail. There is no bursa. The spicula were not 

 plainly seen, but are believed to be of the form usual to the 

 genus. They are about twice as long as the anal body diameter. 



Habitat, Lakes Manapouri and Wakatipu, New Zealand, at 

 depths of 200 to 1150 feet. The species is a near ally of the 

 writer's M. gymnolaimus, of Fiji. 



Dorylaimus Novae Zealandiae, n. sp. 



•0 5-5 20- '45-2' 95- ' 

 5 lb 2 5 28 8 



is the formula of a somewhat immature female, the largest seen. 

 The smooth yellowish skin is destitute of transverse markings so 

 far as can be seen with moderately high powers. Longitudinal 

 markings (internal), due to the muscles, are plainly to be seen. 

 The skin, especially near the head, is innervated, but the nature 

 of the connected external organs was not made out ; there are 

 however no setae anywhere on the body. Very likely the inner- 

 vations indicate the presence of sensory papillae. 



The conoid neck becomes a trifle convex-conoid at the head 

 end, where it is simply truncate, the lip region being neither con- 

 tracted nor expanded. There appear to be six very inconspicuous 

 lips each bearing a single minute papilla. The width of the head 

 may be gauged by the fact that the lip region is about twice as 

 wide as the spear. It seems that lateral organs are present in the 

 shape of U-shaped markings immediately behind the lips and 

 opening backwards. The spear is of the usual form and slides 

 in a ring located a short distance behind the lips. 



The oesophagus is of the form typical for the genus, being 

 however simply conoid in form, enlarging gradually from two-fifths 

 as wide as the corresponding part of the neck in front, to three- 

 fifths as wide as the corresponding part of the neck behind. 

 The lining is rather conspicuous in the posterior part. The oeso- 

 phagus is set off from the intestine by a shallow but distinct 

 constriction. 



The dark coloured intestine is one-half to three-fifths as wide 

 as the body. The cardia is inconspicuous and the cardiac cavity 

 is nearly obsolete. 



The rectum and pre-rectum vary in the two sexes, being longer 



