7Q PROFESSOR O. BUTSCHLI, 



is seen the flagellum, which is sometimes vibrating (fig. 11, a). 

 On either side of the flagellum is seen, though with great 

 difficulty, a faint line, which resembles the optical section 

 of the collar in Salpingseca. Frequently neither the flagel- 

 lum nor collar is visible (fig. 11, c), or the latter appears to 

 be shrivelled, in which case the organism is remarkably like 

 a rhizopod. A nucleus lies within the more or less granular 

 protoplasm, and near it are (fig. 11, a), one, and in some cases 

 three contractile vacuoles («), lying at the hinder end of the 

 body (fig. 11, c). 



Bicosceca, Clark (' Ann. and Mag. Nat. Hist.,' 4th ser., 

 vol. i, p. 139). 



Stylobryoji, Fromentel (' Etudes sur les Microzoaires).' 

 Small organisms with a single long flagellum at the 

 anterior end, together with a large lip- or beak-like pro- 

 minence for the ingestion of food. A contractile vacuole is 

 present, and a nucleus doubtfully so. Each individual, like 

 Dinobryon, inhabits a calyx-like case, into which it can 

 retract itself with the assistance of a very elastic thread which 

 springs from the posterior end of the body. Occasionally, 

 as in Dinobryon, colony-building forms are observed. These 

 organisms are found both in salt and fresh water. 



Bicosoeca lacustris, Clark (?), (op. cit., p. 188, pi. v, 

 figs. 33, 33 c). 



This species is very frequent in ponds, where it attaches 

 itself to Algse and other water plants, and often to the main 

 stem of Antophysa. Solitary individuals are generally 

 observed, whose calyx is attached to a delicate stem. In 

 the forms observed by Clark this stem reached at the most 

 only half the height of the calyx, but in those seen 

 by Biitschli the stem far exceeded the calyx in length 

 (fig. 12, a). Occasionally colony-building forms have been 

 noticed (fig. 12, a b.) The young calyces are produced from 

 the mouths of the older forms, just as they are in Dinobryon. 

 A dark supporting line has several times been seen to extend 

 from the posterior end of such a young specimen to the older 

 one (fi^. 12, b), and consequently it must be asserted that 

 the young calices are provided with stalks, which extend 

 from the inner wall of the older ones. 



The shapes of the calyx are seen in the figures. The 

 openings are either rapidly enlarged as in fig. 12, b, or as 

 rapidly narrowed (fig. 12, c and d),and it can sometimes be 

 clearly seen that the opening is nearly closed, when the 



