20 THE ROTIFEEA. 



covering which is generally present on Ehrenbergii. C. pachyurus, when its auricles 

 are extended, has also a great resemblance to this Copeus ; but the transparent bag- 

 like membrane which hangs behind in folds, and seems to do duty for a tail, is very 

 unlike the stiff tail of Ehrenbergii : the lumbar processes, too, of the former are mere 

 stumps ; * and its size only half that of the latter. 

 Length, -^- c - inch. Habitat. Berlin (Ehr.). 



ALBEETIA VEEMICULUS, Dujardin (40), (PL XXXII. fig. 21). 



SP. CH. Body uniformly cylindrical, slightly tapering to a large, conical, undivided 

 foot. 



The genus Albertia is due to Dujardin, who formed it to contain A. vermiculus, 

 which he had found in the intestines of garden slugs and earthworms. The corona is 

 reduced to a few cilia on a sort of hood, which is protruded from the front of the body. 

 The mastax is forcipate. Four pedunculated bodies are attached to the alimentary 

 canal : the two anterior, sac-like ; the two posterior, kidney- shaped. Dujardin says 

 that " they empty their contents into the intestine, and are refilled by it." The ovary is 

 a long straight sac, with seldom more than four eggs at once. Foetuses, more or less 

 developed, are seen in the largest individuals. Contractile vesicle and four pairs of 

 vibratile tags are plainly visible. 



Length. From T ' T to ^ inch. Habitat. In the intestines of slugs and earthworms. 



TAPHEOCAMPA SELENURA, Gosse (109), (PL XXXI. fig. 5). 



[SP. CH. Body thick towards the head, tapering towards the foot; marked with 

 strong articulations like T. annulosa ; brain opaque, with a distinct red eye on its 

 inner side ; caudal fork a luide crescent ; trophi as in Notommata aurita. 



Since the note in vol. i., p. 17, I have made repeated examinations of this form, 

 which, 1 am now convinced, has specific value. The crescent behind is glassy clear 

 throughout, continuous with the body, not articulated ; its form is that of the new moon 

 when first visible. Cf. Balatro calvus, Claparede (15). 



Length, ^ 1$ inch. Habitat. Lacustrine. P.H.G.] 



NOTOMMATA LIMAX, Gosse (171), (PL XXXI. fig. 6). 



[SP. CH. Body vermiform, integument soft; alimentary canal ample, thrown into 

 apparent annulation by alternate constrictions and swellings ; brain having a globose 

 terminal bulb partly filled with opaque chalk masses, and partly with a large eye ; 

 foot-bulb contained within the body ; toes long, slender, acute, decurved. 



The slug-like softness of the skin gives this species some resemblance to Diglena 

 permollis ; but it is less versatile in outline. The brain recalls N. aurita, the ample 

 sac having a slender tube running through it occupied with opaque specks, and termi- 

 nating in an ovate expansion. This is, in part, opaque with chalk deposits, and its 

 rounded extremity is filled with a large crimson eye (fig. 6 c). There is a likeness to 

 N. cyrtopus in the toes ; but the general facies is very diverse. Swimming, it will 

 suddenly augment its speed, by pushing out for an instant a pair of auricles. There is 

 a distinct tuberculous tail. The whole animal is tinged with pale yellow. 



Length, T i T inch. Habitat. In Utricularia, from a lough near Carrick-on- Shannon, 

 P.H.G.] 



NOTAMMATA ovuLUM, Gosse (169), (PL XXXI. fig. 7). 



[SP. CH. Very small ; body globose, plump ; dorsum gibbous ; venter flat ; brain 

 clear ; eye wanting ; foot short ; toes rather long, acute, decurved. 



1 Mr. W. Chapman and Mr. G. Western have called my attention to the presence of a bunch of setae 

 on the lumbar processes of pachyurus. 



