CATHYPNADiE. 48 



capable of being retracted tvitJmi the lorica ; brain loncj, and cyliiidrical ; foot very 

 short ; toes straight, ending in small, sharp, unshouldered claivs. 



The above characteristics, which I have taken from Ehrenberg's figure and descrip- 

 tion, remove this animal from the genus Euchlanis to that of Distyla. Ehrenberg says 

 that, when fully extended, it looks like a Notommata. The mastax is oval ; the oesophagus 

 very short ; the stomach simple ; the gastric glands spherical ; the brain long and 

 cylindi'ical, with a red eye on its hinder end. 



length, f^ to if^ inch. Habitat. Near Copenhagen (Ehr.). 



Distyla Ludwigii, Eckstein (,41), (PI. XXXIII. fig. 36). 



SP. CH. Lorica ovate, drawn out into a point behind, and slightly holloivcd out in 

 front, between tivo sharp points ; dorsal plate sommohat stvollen, tesselated, scabrous ; 

 ventral pilate flat ; toes long, scythe-shaped, ioide apart at the base; claws not shoul- 

 dered, short ; brain tri-lobed. 



The fore part of the body is soft and flexible, and of the shape of a truncate cone. 

 The corona is feebly developed. The brain has one long central lobe, bearing at its 

 hinder end a red eye just above the mastax ; and two shorter club-shaped lobes, each 

 carrying, cm the inner side of its hinder end, a clear cell, coloured red on the inner 

 border. The small upper ends of these two lobes terminate on the corona, in two 

 minute red points.' 



Four vibratile tags are seen on each side (with the lateral canals), in a rather 

 advanced position. The rest of the organisation is normal. 



The creature has a habit of constantly twitching its oesophagus from side to side. It 

 generally carries its toes wide apart, but sometimes draws them together and bends them 

 up to the ventral surface. 



Length, -^^^ inch. Habitat. Near Giessen (Eckstein). 



Distyla stbiata, Gosse (169), (PI. XXXI. fig. 40). 



[SP. CH. Lorica as in D. Gissensis, but covered with longitudinal stilci ; the front 

 margin projecting in two lateral points (ivhieh, Iwicever, are lost in the pirotrusion of 

 the head, by the evolution of flexible membrane) ; toes slender, straight, more tha7i half 

 as long as lorica, pointed, not sliouldered. 



The lateral infold is narrow and nearly closed. The dorsal sulci are about eight in 

 number, slender and superficial : foot a long large bulb, not divisible into joints; toes 

 long, nearly straight, rods. The dorsal surface is corrugated, besides the sulci ; there 

 is a minute eye, difficult of detection. Two examples occm-red in water sent me by Dr. 

 F. Collins fi-om the pool at Sandhurst MUitary College. 



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



Distyla lipaea, Gosse (171), (PL XXXI. fig. 39). 



[SP. CH. "Lovicdi, skin-like, flexible, plicate: body Jlask- shaped, soft aiid very plump, 

 not pointed behind : toes large, blade-shaped, not shouldered : brain simple ; eye 

 minute, occipital. 



This differs, at sight, from its known congeners by its round, manifestly soft, body, 

 properly egg-shaped, specially in its hind parts, scarcely at all flattened, and destitute 

 of the usual inangulation ; the edges of the dorsal and ventral plates approaching close 

 in the middle, and diverging at both extremities, so that the rounded surface is scarcely 

 broken. The soft integument is constantly thrown into deep irregular plicae, which do 

 not appear to be permanent. A great foot bears, on a condyliform joint, two toes which 

 are widely blade-shaped, longer than the mastax, acute, but not in the least shouldered 



' See note, vol. ii. p. 37. Both Mr. Gosse and myself have failed to see many of Herr Eckstein's 



red spots. 



