56 THE ROTIPEEA. 



set just as they are in F. trilobata, the larger row stretching outwards, and the smaller 

 inwards ; and the same rapid flicker may be seen on occasions to run all round the edge. 

 of tlic corona] cup. The orifice of the coronal cup alters constantly, now opening in the 

 characteristic way shown in PL II. fig. 5a, and now reduced to a slit ; or even closed 

 in puckers. Two dorsal ridges, as in F. ambigua, run like buttresses from the body to 

 the back of the dorsal lobe, and in the lowest portion of the deep hollow between these 

 lie the two pale pink eyes ; both in the neck, and one close to each buttress. The true 

 ciliary wreath is distinctly visible throughout its whole length. It is a long horse- 

 shoe-shaped and ciliated ridge, sloping sharply down from the bottom of the coronal 

 cup into the vestibule. The contractile vesicle is unusually large and distinct ; close 

 to it, and apparently situated in it, is a cluster of yellow globules, which look black by 

 transmitted light. 



This strange and beautiful Floscule was discovered by Mr. J. Hood in December 

 1882, in a ditch on Tent's Muir, Fifeshire. 



Length, ^ inch. Habitat. Marsh pools ; Fife (J.H.) : rare. 



F. calva, Hudson. 

 (PL III. fig. 3.) 

 Floscularia calva .... Hudson, /. Roy, Micr. Soc. 2 Ser. vol. v. 1885, p. 010. 



SP. CH. Lobes two, short ; dorsal lobe the larger ; setae very short, radiating from 

 the thickened summits of the lobes, incapable of cilia-like action; body unusually long 

 and narrow, its outline confluent with that of the coronal cup, so that there is no neck ; 

 eyes cervical. 



Mr. J. Hood discovered this species in 1884 on a Sphagnum leaf, in a mossy pool on 

 Tent's Muir, only twelve inches deep, and on another occasion found it in Loch Lundie 

 at a depth of ten feet. I have seen only two specimens of it, and those under disadvan- 

 tageous circumstances ; as each had dropped from the plant on which it was found, and 

 was lying in the sediment at the bottom of the tube. The creature appears to attach 

 itself rather to its tube than to the stem of the plant which bears the tube, and so to 

 be easily detached. I am indebted to Mr. Hood for drawings of the young male and 

 female (PL III. figs. 3a, 3b), each of which he saw hatched from eggs laid in the tube. 

 The male is about 7 {„ inch in length, and resembles that of F. campaunlala. 



Length, ,■.'., to ■-,',, inch. Habitat. Lochs and marsh pools, on Myriophijllum and 

 Sphagnum; Forfar, Fife (J.H.) : rare. 



F. mutabilis, Bolton. 



(PL III. fig. 2.) 



Floscularia mutabilis . . Hudson, J. Roy. Micr. Soc. 2 Ser. vol. v. 1885, p. 609, pi. xii. figs. 1-3. 



SP. CH. Lobes two, veil developed; dorsal lobe decidedly the buyer; setae rather 

 short, set round the whole circumference of the disk, and capable of cilia-like motion; 

 eyes near the summit of the dorsal lobe. 



F. mutabilis somewhat resembles F. calva, but is at once distinguished by its 

 larger lobes, moveable seta?, and by its unique habit of swimming. The animal has not 

 as yet been found attached to any water plant. It looks, when resting in its case at 

 the bottom of a live cell, just like an ordinary Floscule that had been knocked off its 

 perch, as the setas are straight and motionless. After a short rest it pulls down the two 

 lobes to a level with the bottom of the depressions between them, and so alters the corona 



