610 Transactions of the Society. 



were some two-lobed Floscule that had dropped off its perch. The 

 setae surrounding the trochal cup are somewhat scanty and short, 

 but do not seem to differ from those of an ordinary species. After 

 a few moments' rest, however, the Floscule pulls down its two lobes, 

 and so alters the aperture of its disk (fig. 2) that it now resembles- 

 that of an (Ecistes. 



At the same time the setae lash the water as cilia do, and the 

 creature sails away, case, eggs, and all, stern foremost. Mr. Bolton 

 thinks that the setae are held stiffly out (as usual) when the 

 Floscule swims, and that the motion is effected by a row of small 

 cilia running round the trochal cup, just under the bases of the 

 setae. In favour of this supposition is the fact, that some species of 

 Floscules have such a row of cilia, and that just such an arrange- 

 ment appears to exist in the male (fig. 3) : but I confess 

 that my own opinion is adverse to this suggestion. I spent much 

 time watching the disk of F. mutahilis as it swam, and it appeared 

 to me that it was the row of setae themselves which set up the 

 apparent ciliary action. It was very striking how each individual 

 seta became instantly visible as the action ceased, though quite 

 invisible before. 



I saw two forms of young, one of which (fig. 3) I have 

 little doubt is the male. I did not, however, succeed in catching 

 it, and in viewing its internal organs. 



Floscularia calva n. sp. mihi. 



This is a rare Eotiferon, and was found last year by Mr. J, Hood 

 in the lochs and marsh-pools of Fife and Forfar, on Myriophyllum 

 and Sphagnum. 



It is a very bad traveller, for it appears to withdraw its foot 

 from the plant it is on, and to fix it in the tube itself. In con- 

 sequence of this the tube and the Eotiferon are easily knocked off the 

 stem they were originally on ; and every specimen, that came to me 

 alive, was lying at the bottom of the tube mixed up with debris of 

 all kinds. Under these circumstances it was difficult to observe it 

 well ; still I made out distinctly that it had only two lobes, a 

 dorsal and a ventral one, and that the setae were remarkably short. 

 The dorsal lobe, as usual, was the larger, and was a little swollen at 

 its highest point, so as to give it rather a knobbed look when seen 

 sideways. The body too was unusually slender for its length, so 

 that the whole outline from the junction of the foot to the top of 

 the trochal cup was almost cylindrical. 



It resembles F. mutahilis in having only two lobes, but differs 

 from it in its cylindrical shape, in the position of the eyes (which 

 is normal), and in the inability to alter its disk and swim. 



It is the first two-lobed Floscule that has ever been found. 



