66 THE ROTIFERA. 
Rs crrorius, Gosse, sp. nov. 
(Pl. XX. fig. 14.) 
[SP. CH. Body arched, parallel-sided ; skin flexible; brain opaque; toes short, 
blade-like, decurved ; no sub-styles. 
The brain, descending far into the occiput, is furnished at the end with a large and 
opaque chalk-mass. This I have signified in the specific name, from xiywAdca = chalk. 
Its component cells are very distinct at the lower margin, which is sub-truncate. When 
the fore-parts are retracted forcibly, as is frequently the case, the conspicuous chalk- 
mass will sometimes reach to two-thirds of the entire length, displacing the 
viscera. A pair of small auricles are occasionally thrust out (fig. 14), without any 
sensible augmentation of speed, while the animal pushes through sediment. I have 
looked in vain for an eye, though it may have been concealed by the opaque cells. The tro- 
phi (figs. 14, c) exhibit the virgate pattern common in the family. The toes are short 
compared with those of tigris, decurved ; set side by side, and widely expanded (fig. 14). 
This seems a quite distinct little species, there being no other with which it can be 
confounded, on examination. The specimen described was in the bottle with which 
Dr. Collins favoured me in June 1885. Its movements were by no means rapid, but 
persevering, forcing its way incessantly through the leaves of water-moss and sedimentary 
floceose. I have lately found a second in water from Mr. Bolton.—P.H.G.] 
Length, ,}, inch. Habitat. Sandhurst, Berks; Kingswood Pool, Birmingham 
(PABEG:): 
R. cALyptus, Gosse, sp. nov. 
(Pl. XX. fig. 16.) 
[SP. CH. Body and toes as in cimolius; brain clear ; face furnished with pendent 
veil-like lobes of flesh. Marine. 
This has much resemblance to F. cimolius, but it is larger, and the brain-sac is clear, 
not opaque. No eye has been visible: the toes are of like dimensions, pattern, and de- 
curvation. A remarkable peculiarity is that m the front a thick and broad veil of trans- 
parent flesh hangs down, apparently bilobed, meeting another great lobe of like appearance 
from below. ‘The function of these lobes Ido not know. The body is cylindric, with 
no visible dorsal ridge. The mastax and trophi conspicuous, but ill-defined. An ample 
brain descends with a point into the occiput, with neither chalk-deposits, nor eye. A 
long and slender cesophagus leads to an ample alimentary canal. The ovary occupies 
the ventral recion of the cavity; and a moderate contractile vesicle is behind all. 
A single example of this charming little Rattulus I found in October 1885, with many 
other species of Rotifera, in sea-water, procured for me by Mr. Hood from the tide-pools 
of the Firth of Tay. In manners it was sluggish, contracting and lengthening itself 
with uniform persistence without changing its place. It was of hyaline transparency 
and colourlessness.—P.H.G.] 
Length, ;3, inch. Habitat. Tide-pools on the Scottish coast (P.H.G.). 
R. SEJUNCTIPES, Gosse, sp. noy. 
(Pl. XX. fig. 15.) 
[SP. CH. Body projecting much above and behind the foot; toes two, coequal, 
slender, decurved, set side by side, wide apart. 
Of this remarkable species Dr. F. Collins has made several graphic sketches in his 
Note-book. It is of the lunaris form, stout, plump, and curyed; the foot consists of a 
great basal bulb, wholly internal, and a second joint, thick and short, to which are arti- 
culated two toes; these are acute slender styles, so curved as to continue the outline of 
the body, mutually equal, set on the same plane, but (which is most unusual) wede apart. 
