78 J. E. LORD ON TWO NEW ROTIFERS. 



microscopists will be in a position to compare the forms. It will, 

 however, be advisable to characterise my C. cataracta rather more 

 fully than is usually necessary. 



About three miles from my residence, in a narrow gorge, there 

 are some almost perpendicular rocks, from 80 to 90 ft. in height, 

 clown which flow, at several points, considerable streams of water. 

 Here the rocks are covered with golden saxifrage, mosses, and 

 confervoid Algse, and it is chiefly from the latter that I procure 

 the new Callidina. It is one of the larger forms of the Bdelloida 

 and very Philodina-like ; indeed, I at first took it, or rather 

 mistook it for P. aculeata, but a short examination proved that 

 it could not be that Kotiferon, and as there are no eyes, it is 

 technically a Callidina. It is an extremely sluggish animal, — it 

 may be under observation for hours without everting either its 

 anterior or posterior parts, and these may be exserted for a 

 similar period, and yet no disposition be shown to evert the 

 corona. However, on being kept in confinement for a day or 

 two, some of this shyness disappears, and it then feeds with 

 tolerable freedom. From several observations made under these 

 favourable conditions, I am able to say that in feeding, the foot 

 is fairly extended, but the neck is much retracted — so much so 

 that very frequently the antenna is protruded between the two 

 medio-dorsal spines, exactly as in Brachionus. The lobes of the 

 corona are wider than the neck ; there is a rather deep, square 

 sulcus between them, and a considerable thickening of the neck 

 immediately below. The antenna was two- jointed, slender, and 

 about as long as the wndth of the neck at its juncture with the 

 trunk, and set with diverging setae at the tip. The foot was 

 rather long and tapering, at full extension of, I think, 5 joints, 

 although at times it is difficult to see more than 4. The spurs 

 are small and conical, with a quite perceptible interval between 

 them. The toes are very seldom everted, and then as usual 

 instantly covered by the penultimate segment of the foot; but 

 there were 4 toes, in two unequal pairs, each pierced by several 

 pores. The most striking peculiarities, however, were in the 

 trunk, and by these it may the most easily be recognised when 

 seen. This was brownish, the integument of thick, leathery 

 texture, with 14 longitudinal ridges, the 8 dorsal ones acute and 

 strongly marked, the latero-ventral ones fainter, the outer pair 

 occasionally very indistinct. The four central ridges are not 



