Peridinaea.] THE infusoria. 249 



three short, straight, horn-like processes, as shewn in 

 Jiff. 221. A proboscis is not visible. Found in phospho- 

 rescent sea-water. Length 1-5 70th. 



379. Peridinium fusics. The spindle-shaped Peridi- 

 nium is of a yellow colour, intensely phosphorescent, and 

 brilliant at night. The lorica is ovate, oblong, and smooth. 

 The two horns are straight and opposed, giving the 

 creature the form of a spindle, as shewn at figures 222 

 and 223 ; in the latter the proboscis is in the usual 

 vibrating state. Ehrenberg states that he has seen the 

 cilii of the furrowed zone, and the proboscis single and at 

 rest; also an opening or mouth in the lorica, near the 

 insertion of the proboscis. Length, with horns, 1-1 20th 

 to l-90th. 



380. Peridinium furca. The forked Peridinium is oi 

 a yellow colour, and very phosphorescent ; the lorica is 

 urceolate, with three horns ; two in front short, and in the 

 form of a fork ; the posterior is longer. Found in phos- 

 phorescent water, at Kiel. Length l-120th. 



Genus LXXXVL Glenodinium, The wreath Animal- 

 cules, with eyes. — Peridinea with mobile cilii, placed in a 

 transverse furrow, or zone, and provided with an eye. 

 The organization is much the same, in other respects, 

 as those of the preceding genus. In G. cinctum only 

 is a filiform proboscis seen; this emanates from the 

 middle, and, like the wreath of ciUi, vibrates. This organ, 

 though hitherto unobserved, is probably present in the 

 other species. The lorica is combustible. The stomach- 

 cells and minutely-granulated ova are visible in all the 

 species, but the former are very distinct in G. apicula- 

 tum. The red eye is in the form of an elongated or 



