76 THE ROTIFERA. 
duals, lamellaris and muticus, which he supposed one and the same? I confess I haye 
had suspicions that these are but one species. I have had specimens in my live-box of 
what seemed lamellaris, with the three caudal spines clear enough; yet in a few 
minutes I could find only specimens of muwticus, with no spines at all to be discerned, to 
my great bewilderment. It seemed as if the spines could at will disappear, but I cannot 
conjecture how. This has happened repeatedly. Except the greater development of 
the neck, there is little else to discriminate the two.—P.H.G.] 
Length, +4, inch. Habitat. Fresh waters around London; an aquarium at Tor- 
quay (P.H.G.): scarce. 
S. uniIseTAtTus, Collins. 
(Pl. XXI. fig. 8.) 
Stephanops uniseta ‘ . . Collins, Science Gossip, 1872, p. 11, figs. 9a, b. 
[SP. CH. Lorica ovate, its hinder end without points, but bearing a dorsal spine, 
very slender, straight, as long as the body ; foot with a slender tail and two toes. 
The discoverer of this interesting form has furnished me with a number of examples 
from its original habitat: all inhabiting the leaves of a subaquatic moss. In the “ Jour. 
Roy. Mier. Soc.” 1885, Dr. Hudson has suggested the identity of Mr. Lord’s species! with 
this; but I think its thick fore-parts, the curvature of its spine, and several other pecu- 
liarities, indicate their diversity. Ifso, we have five dorsal-spined species. The spine 
here is so attenuate that it may well be called a seta. According to my observations, it 
vibrates with the tremulous motions of the body, but has no proper separate motion. 
Its base is attached to a shelly knob, level with the bottom of the mastax ; it is quite 
straight, and its point reaches the tips of the toes. The hind edge of the lorica is 
truncate and unarmed, as in mwticus. There are two slender pointed toes, and a minute 
spinous tail at right-angles from their base. 
The species affects concealment, but occasionally comes out to swim with a smooth 
gliding motion in the open interspaces ; often subject to a momentary vibration through- 
out.—P.H.G.] 
Length, ,}, to ;}, inch. Habitat. Sandhurst (Collins; P.H.G.): not rare. 
S. cHLENA, Gosse, sp. nov. 
(Pl. XXI. fig. 9.) 
(SP. CH. Lorica cylindric, forming a semicircular occipital shield, without any 
constriction ; toe single. 
Ehrenberg’s S. cirratus (not yet recognized with us) appears to lead to this, the sides 
being straight without any neck. The face is oblique, wider than any other part, beset 
with irregular fleshy lobes, with a retractile lobe forming a kind of chin. A great sac- 
like brain carries one minute eye, very difficult to be seen. The lorica, without any 
diminution in width, ends behind in three points, and resembles a short cloak reaching 
to the loins. From this descends a thick and long foot, whose penultimate joint carries 
an acute spine at a right-angle, which is a proper tail; thence a stout taper pointed 
toe, along whose middle a line may be dimly seen, suggesting two toes soldered into one. 
The rectum may be traced to a cloaca between the tail and the toe. Its manners are 
those of its fellows. In swimming, its movements, already rapid, are accelerated now 
and then by sudden starts, probably predatory.—P.H.G.] 
Length, ;}, toy}, inch. Habitat. Sandhurst: Woolston (P.H.G.)?; pools: rare. 
' Micr. News, vol. iv. 1884, p. 146, fig. 24. The figure of this Stephanops has one dorsal spine, and 
one short spine, or tail, sloping upwards, just above the toes. 
2 There are differences in form and size between the Sandhurst and the Woolston specimens, so 
considerable that possibly these may be distinct species : the former much larger, more slender, the 
front not sensibly lobular ; the whole animal yellow-tinged.—P.H.G. 

