862 UTRICULARIA MONTANA. [Chap. XVIII. 



to prevent too large animals forcing an entrance through the 

 valve. The many glands of diverse shapes attached to the 

 valve and round the collar in the previous species are here 

 absent, with the exception of about a dozen of the two-armed 

 or transversely elongated kind, which are seated near the 

 borders of the valve, and are mounted on very short foot- 

 stalks. These glands are only the i^sn of an inch (.019 

 mm.) in length; though so small, they act as absorbents. 

 The collar is thick, stiflF, and almost semicircular; it is 

 formed of the same peculiar brownish tissue as in the former 

 species. 



The bladders are filled with water, and sometimes include 

 bubbles of air. They bear internally rather short, thick, 

 quadrifid processes arranged in approximately concentric 

 rows. The two pairs of arms of which they are formed dif- 

 fer only a little in length, and stand in a peculiar position 



Fig. 28. 



( Utrictilaria montano.) 



One of the quadrifid processes ; much enlarged. 



(Fig. 28) ; the two longer ones forming one line, and the 

 two shorter ones another parallel line. Each arm includes a 

 small spherical mass of brownish matter, which, when 

 crushed, breaks into angular pieces. I have no doubt that 

 these spheres are nuclei, for closely similar ones are present 

 in the cells forming the walls of the bladders. Bifid pro- 

 cesses, having rather short oval arms, arise in the usual po- 

 sition on the inner side of the collar. 



These bladders, therefore, resemble in all essential re- 

 spects the larger ones of the foregoing species. They differ 

 chiefly in the absence of the numerous glands on the valve 

 and round the collar, a few minute ones of one kind alone 

 being present on the valve. They differ more conspicuously 

 in the absence of the long bristles on the antenna? and on the 

 outside of the collar. The presence of these bristles in the 

 previously mentioned species probably relates to the capture 

 of aquatic animals. 



