PHOTOZOA OK M>n'Li:.ST ANIMALS. 



19 



Fig. 15. 



polymorphus, the Truinpet PulypiLS (Fij(. 14), has a fimucl-shapetl High Wall 



l)ody of gi'CL'D colour, cil)out ^j'- of an inch in lenj^th, and is usually *-;^'^ 



to be found singly or in t^roiips attached by the narrow eml to (jaUery? 



duck-weed, sticks, &c. ; when swimniini^, the ortranism ehau<re.s its 



shape cousideral^ly, becoming ovoid or 



pear-shaped. The cilia are uniformly 



distributed over the Avhole surface, but 



form a spiral fringe of long cilia round 



the anterior edge. See Plate Xllv.. 2. 



in the Case. 



Paramecium aare/ia, the Slipper 

 Animalcule (Plate XIIa., 1, in the 

 Case), has an oval flattened body with 

 cilia uniformly distributed over the 

 whole surface. Siyloni/chia (Fig. i:») 

 has ciliu only on the under surface of the 

 flattened body; the thick spine-like oruaiis 

 are peculiarly modified cilia by means of 

 which the organism can stalk about. 





ACINETARIA. 



The body, in this group of Corticata, 

 is provided with tentacle-like organs in 

 place of cilia and flagella. Ikndrosoma 

 radians (Plate XIII. in the Case) is a 

 fresh-water Infusorian of rather large 

 size, attaining a height of iV of ^^ \niA\. 

 A fixed stolon gives rise to branching 

 ti'unks ; each branch terminates in 

 numerous suctorial knobbed tentacles, 

 which act by plunging into the bodies 

 of tluii' prey and sucking up the protoplasm. In the young stage, 

 Dendrosoma is free and provided with cilia, which disappear when 

 the animal becomes flxed. 



Uijlontjchia mijlihi", the Musst-l- 

 Animalcule. Mnguified loO 

 (liaiuiters. a, laoutli; b, con- 

 Iractile vacuole; c, nucleus. 



C. 1' 



