260 Macteay Memorrat Vouvme. 
11. M. muscorum, Dujardin. Ze 25to3mm. The small dorsal tooth 
is near the centre of the pharynx, which is nearly one-half as wide as the head. The 
somewhat conoid cesophagus is three-fourths as wide as the neck, and the intestine is 
three-fourths as wide as the body. The rectum equals the anal body-diameter in 
length. The tail diminishes somewhat more rapidly near the terminus. The reflexed 
ovaries, each containing about a dozen ova arranged single file, extend half-way back 
to the projecting vulva. The eggs are one and one-half times as long as the body is 
wide, and three-fifths as wide as long. The anterior sexual organ is somewhat the 
larger. 
Hab.— Among moss, &c., Western Europe. 
12. M. major, n.sp. ee s4mm. The conoid neck terminates ante- 
riorly in a truncate head bearing two rows of papille arranged as usual. The lateral 
organs are small and are situated near the lips,—slightly further forward than the 
point of the dorsal tooth. The narrow mouth leads into a pharynx as long as the 
head is wide, and two-fifths as wide as long, pointed at the bottom and strongly lined 
with chitin. The tooth, which, though small, is conspicuous, is situated considerably 
in front of the middle of the pharynx. The lateral fields are one-fifth as wide as the 
body. The intestine, which is marked off from the cesophagus by a shallow but 
distinct constriction, is greenish in colour, and composed of rather small cells showing 
an indistinct tessellation ; the rectum is equal in length to the anal body-diameter. 
The conoid tail is ventrally arcuate, and ends in a blunt terminus containing a 
spinneret of the usual form. The eggs are probably less than twice as long as wide.- 
The reflexed ovaries reach about half-way back to the vulva. {g3-39g5—33 34mm. 
The tail of the male somewhat resembles that of the female in general form, but is 
more strongly arcuate. The spicula are elongated, arcuate, tapering toward both 
ends, not cephalated, and twice as long as the anal body-diameter, and are situated 
close together ; the accessory pieces are well developed, and surround the spicula 
behind the middle, their blunt proximal points appearing in front of the ventral 
contour of the spicula. The protruding-muscles of the spicula are attached to the 
body-wall near the middle of the tail. A ventral row of about twelve conspicuous 
innervated mammiform accessory organs occur in front of the anus, and extend over 
a space about twice as long as the tail; each organ is situated on the posterior side 
of a transverse chitinous ridge extending one-fourth the distance round the body. 
The anterior two or three and the posterior one of these organs are smaller than the 
others ; they are equidistantly placed, except the posterior, which is removed some- 
what from its fellows. Oblique copulatory muscles are found co-extensive with the 
accessory organs and the crenate ejaculatory duct. The testicles occupy the 
middle third of the body. There are two pairs of ventrally submedian papille, also 
