262 Macrieay Menmoriat VoLuMe. 
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 papille or 
accessory organs is found just in front of the anus. The low post-anal papille 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 proxime cephalated by slight expansion. The two slender accessory pieces 
are parallel to the spicula and two-fifths as long. 
flab.—Among moss and aquatic plants, and in mud and sand near by, Western 
Europe. 
15. M. microstoma, Bastian. 4,35 37°¢ 25mm. The labial papillee 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 papillee, 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. 
Hfab.—F¥ resh soil and fresh water, Holland, common ; England. 
. . 2°79 14:8 50° 93° . . . . ae 
16. M. fovearum, Dujardin. ;;~; 3-7 25mm. This species is insufficiently 
known. 
Flab.—F rance. 
Genus CHROMADORA, Bastian. 
pen 2282s 20" 48") 84° . 
1. C. minima, nsp. 33-33 a3 a8 39 ¢™™. 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 striz resolvable with the highest powers of the 
microscope into rows of dots. The cylindroid neck is capped by a truncate head 
bearing on its outer margin six spreading sete, 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 
