62 THE ROTIFERA. 
I can give little information about this species, which yet seems distinct. I have 
seen but a single example, and that was moribund, if not actually dead. I met with it 
in June 1885, in water from Woolston Pond, Hants, courteously supplied by Miss 
Davies. Spontaneous motion had not ceased, particularly in the toe-spines, and the 
structure of the abdominal viscera was still perfect ; yet all the foreparts were one mass 
of dissolving flesh and air-bubbles, protruding from the front and spreading around. An 
eye-spot could be detected in the mass; but of the trophi not a trace. 
The form recalls MW. rattus ; but greatly produced in length, and without discernible 
carina. I hesitate whether it should not be placed in the genus Celopus ; for it appears 
to have two unequal toe-spines, the smaller fitting beneath the other, and about one- 
fourth of its length. But the longer is straight, the shorter curved. So that, in defect 
of fuller observation, I assume that the shorter is but one of the supplementary styles 
common in this family ; though I could detect other minuter spinelets at the base. 
The specimen I unfortunately neglected to measure ; but the total length to the toe- 
point was, approximately, ;}5 inch.—P.H.G.] Habitat. Woolston (P.H.G.). 
M. nLoneata, Gosse, sp. nov. 
(Pl. XX. fig. 8.) 
[SP. CH. Body nearly cylindric, slightly larger before than behind ; lorica smooth- 
edged in front; ridge long, low, medial; toe as long as the lorica; sub-styles one- 
twentieth the length of the toe. 
This seems a very distinct species. Its smooth, hyaline, arched lorica, with a widely 
truncate front edge, quite smooth, but tapering in a graceful curve to the hinder end, 
where a small tubular orifice, also abruptly truncate, allows emission of the foot; is very 
distinctive from the preceding two species, to which, however, its remarkable length 
allies it. It is nearer to M. carinata than they; yet sufficiently remote from this by 
conspicuous characters ; in particular, by the dorsal ridge, which is low throughout, and, 
as I believe, medial. The greatest depth of the lorica (viz. just behind the front edge) 
is just one-fourth of its length. This front edge, destitute of points, is apparently 
attenuated to thin membrane, thrown into minute transverse folds, inverted and everted 
with the motions of the head-mass. The foot is of one minute joint, exterior to the 
lorica. It bears one toe, a spine of great length and slenderness, almost quite straight, 
nearly uniform in thickness to the fine point. Its length about equals that of the lorica. 
Two accessory styles, very minute, are appressed to its base. The mastax is ample, and, 
as in MW, carinata, having two mallei, unequal and dissimilar. 
I owe my acquaintance with this charming species to Mr. Hood of Dundee, whose 
keen eye had already detected its specific distinctness. He sent me, in November 1885, 
water from one of the pools near Dundee, contaming a number of living specimens. 
They are sprightly and active, swimming elegantly through the clear water, with a 
smooth but swift gliding movement.—P.H.G.] 
Length. Total, .4, inch; of toe, +}, inch; of sub-styles, +75, inch; depth of lorica, 
gly inch. Habitat. Loch near Dundee (J.H.); Birmingham (P.H.G.): not rare. 
M. natrus, Hhrenberg. 
(Pl. XX. fig. 9.) 
Monocerca rattus 6 C : Ehrenberg, Die Infus. 1838, p. 422, Taf. xlviii. fig. 7. 
[SP. CH. Body ovate, truncaie in front, pointed behind ; ridge reaching to two- 
thirds, evenly arched ; toe longer than body-and-head together ; sub-styles, very minute. 
The lorica is elegantly ovate, subtruncate before, where a thick head protrudes, with 
a rounded front, on which numerous pimples are beset with bristle-like cilia, making 
