428 UTKICULAEIA VULGAEIS. Chap. XVII. 



and more horizontal pair; the four together forming 

 a perfect quadriiid. A trace of the primary division 

 between the two cells on the summits of the papillae can 

 still be seen between the bases of the longer processes. 

 The development of the quadriiids is very liable to 

 be arrested. I have seen a bladder -^ of an inch 

 in length including only primordial papillae ; and 

 another bladder, about half its full size, with the 

 quadrifids in an early stage of development. 



As far as I could make out, the bifid processes are 

 developed in the same manner as the quadrifids, 

 excepting that the two primary terminal cells never 

 become divided, and only increase in length. The 

 glands on the valve and collar appear at so early an 

 age that I could not trace their development ; but 

 w^e may reasonably suspect that they are developed 

 from papillae like those on the outside of the bladder, 

 but with their terminal cells not divided into two. 

 The two segments forming the pedicels of the glands 

 probably answer to the conical protuberance and short 

 footstalk of the quadrifid and bifid processes. I am 

 strengthened in the belief that the glands are de- 

 veloped from papillae like those on the outside of the 

 bladders, from the fact that in Utricular i a amethystina 

 the glands extend along the whole ventral surface 

 of the bladder close to the footstalk. 



Utriculaeia vulgaris. 



Living plants from Torksliire were sent me by Dr. Hooker. 

 This species dififers from the last in the stems and leaves being 

 thicker or coarser; their divisions form a more acute angle 

 with one another; the notches on the leaves bear three or 

 four short bristles instead of one ; and the bladders are twice 

 as large, or about i of an inch (5*08 mm.) in diameter. In 

 all essential respects the bladders resemble those of Utricularia 

 negleda, but the sides of the peristome are perhaps a little more 



