200 1>. BBYCE ON TWO NEW SPECIES 0>' 



abrupt departure and the type, and I anticipate that ultimately 

 a new genus must be created to receive this species. Biit I have 

 only found one single specimen, and although I kept it for some 

 fourteen days I failed to get any precise observations of the 

 disposition of its ciliary wreaths. The creature was very timid 

 and sluggish, and on the few occasions I saw the wheels pro- 

 truded it baffled my efforts by either erecting itself until one' 

 could see into the mouth, or leaving hold it would swim away to 

 be presently stopped by coming full tilt against some obstacle. 

 Over and over again it was brought to a stop with its horns 

 against the glass forming the bottom of the cell, and there it 

 w^ould continue for some minutes, the wheels in motion and the 

 foot waving directly in the line of sight. Thus standing either 

 upon its foot or upon its head it constantly frustrated my 

 designs, and I could only obtain approximate sketches and 

 cursory notes. 



The lateral edges of the discs are produced forward as two 

 horn-like processes, which at first receding from each other are 

 yet so curved that towards the tips they have begun to 

 approach and do approach as closely as at their bases. For 

 some three-fourths of their length they advance almost in the 

 plane of the body, but from thence they are decurved till they 

 point nearly at right angles to their original plane. I could see 

 no gap between the two halves of the cilia-bearing surface, nor 

 any break in the line of cilia, or in the line of the discs. That 

 portion which most nearly corresponded to the usual trochal 

 discs was here replaced by a somewhat concave surface, the 

 upper margin showing in dorsal view as an approximately 

 straight line joining the bases of the horns. The concavity of 

 this surface seemed to be continued some little way forward 

 along the inner side of the horns, and, as well as I could see, 

 the cilia of the principal wreath were disposed along the whole 

 dorsal margin of the concavity, and, at least, a great portion of 

 the ventral, extending thus not merely across the front, but 

 even some little distance along the inner margins of the horns 

 on either side. I could not define any portion of the secondary 

 wreath nor the form of the mouth cavity. In the act of pro- 

 truding the wheels one horn was pushed forth before the other, 

 as though in retraction it had been folded across and outside it, 

 'jooth being bent inwards from their bases. 



