20 THE ROTIFERA. 



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

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

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

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

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



Length, gV inch. Habitat. Berlin (Ehr.). 7.^^,><- 



Albebtia veemiculus, Dujardiii (40), (PI. XXXII. fig. 21). 



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

 foot. 



The genus Alhertia 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. Dujardm 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. ^ ," i> ^ J c^ 



Length. From yV to ^o inch. Habitat. In the intestines of slugs and earthworms. 



Taphbocampa selenuba, Gosse (1G9), (PI. XXXI. fig. 5). 



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

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

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



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

 which, I 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, j^i^ inch. Habitat. Lacustrine. P.H.G.] 



Notommata limax, Gossc (171), (PI. XXXI. fig. 6). 



[SP. CH. "Bo&Y vermiform, integument soft ; alimentary canal aiwjjZc, thrown into 

 apjMrent annulation hy alternate constrictions and sioellings ; brain having a globose 

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

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



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

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

 sac having a slender tube ruiming 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 genei-al 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, -i4g^ inch. Habitat. In Utricularia, ixova slough near Carrick-on-Shannon, 

 P.H.G.] 



NoTAMMATA ovuLUM, Gossc (1G9), (PL XXXI. fig. 7). 



[SP. CH. Very small ; hodij U^obose, plinnp ; AorsvLm gibbotis ; venter fiat ; brain 

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



' Mr. \V. Chapman and Mr. G. Western have calletl my attention to the presence of a bunch of setae 

 on the huiibar processes oi i^(whyurus. 



