826 



UTRICULARIA NEGLECTA. [Chap. XVII. 



thin and flexible valve would be liable to be distorted, and 

 in this case would not act properly. 



Altogether the entrance into the bladder, formed by the 

 transparent valve, with its four obliquely projecting bristles, 

 its numerous diversely shaped glands, surrounded by the 

 collar, bearing glands on the inside and bristles on the out- 

 side, together with the bristles borne by the antenna;, pre- 

 sents an extraordinary complex appearance when viewed 

 under the microscope. 



We will now consider the internal structure of the blad- 

 der. The whole inner surface, with the exception of the 



Fio. 21. Fig. 22. 



( inHcularia negUda.) ( Ulrieularia negleela. ) 



Rmnll portion of inside-of bladder, One of tho qiia<lrifid proMflBM 

 much ciilarRed, showing quad- greatly enlarged, 



rifld processes. 



valve, is seen under a moderately high power to be covered 

 with a serried mass of processes (Fig. 21). Each of these 

 consists of four divergent arms; whence their name of 

 quadrifld processes. They arise from small angular cells, at 

 the junctions of the angles of the larger cells which form 

 the interior of the bladder. The middle part of the upper 

 surface of these small cells projects a little, and then con- 

 tracts into a very short and narrow footstalk which bears the 

 four arms (Fig. 22). Of these, two are long, but often of not 

 quite equal length, and project obliquely inwards and to- 

 wards the posterior end of the bladder. The two others are 



