Cobb — Nematodes, mostly Australian and Fijian. 1 3 



is more slender, the posterior two-thirds being cylindrical and only one-sixth as wide 

 as at the anus. A ventral row of eighteen or nineteen equidistant papillae or 

 accessory organs is found just in front of the anus. The low post-anal papillae are 

 arranged as follows : 1, near the anus a pair of ventral submedian ; 2, near the other 

 end of the anterior third of the tail another pair of ventral submedian ; 3, on the 

 middle third of the tail three dorsal ; 4, on the terminus two. The two equal 

 setaceous spicula are about half as long as the tail, their distal halves being arcuate 

 and their proximae cephalated by slight expansion. The two slender accessory pieces 

 are parallel to the spicula and two-fifths as long. 



Hab. — Among moss and aquatic plants, and in mud and sand near by. Western 

 Europe, 



15. M. microstoma, Bastian. 2-6 a-i s-e 34 3- 2-6 mm. The labial papillae of the inner 

 row are the larger. The dorsal tooth is located a little in front of the middle of the 

 elongated pharynx and is opposed by transverse chitinous ridges on the wall of the 

 ventral side of the cavity. There are also small teeth at the base of the pharynx. 

 The intestine is two-thirds as wide as the body and the rectum is one-half as long as 

 the anal body-diameter. The anterior fourth of the tail is conoid ; thence it is very 

 narrow to the slightly swollen terminus. The form of the male is similar to that of 

 his mate. There is a ventral row of twenty pre-anal papillae, and three ventral, as 

 well as some lateral, post-anal ones. The slender spicula are bent at a blunt angle. 

 The accessory piece is slender and much shorter than the spicula. Oblique copula- 

 tory muscles appear to be present. 



Hab. — Fresh soil and fresh water, Holland, common ; England. 



16. M. fovearum, Dujardin. , , ^^'^ ^3] ^\ 2-5mm. This species is insufficiently 

 known. 



Hab. — France. 



Genus CHROMADORA, Bastian. 



1. 0. minima, n.sp. 3^3 — 3-8 4-3 4-8 8-2 ■*°™- is the formula found from the measure- 

 ments of the only two specimens seen, both immature females. The cuticle is 

 traversed by very fine transverse striae resolvable with the highest powers of the 

 microscope into rows of dots. The cyhndroid neck is capped by a truncate head 

 bearing on its outer margin six spreading setae, each about one-sixth as long as the 

 head is wide. The number of lips appears to be twelve, as indicated by the number 

 of longitudinal ribs round the mouth opening. The spiral lateral organs are situated 



