THE WHEEL ANIMALCULES (ROTATORIA) 595 



44 (43) Lorica broader Cathypna Gosse. 



Several species. 



Representative species (Fig. 892). . . Cathypna luna Ehrenberg. 



45 (42) The two plates not connected by membrane. . Euchlanis Ehrenberg. 

 Large, conspicuous, clear species; lorica not sculptured or otherwise marked. Many species. 



Representative species (Fig. 893) . . Enchlanis macrura Ehrenberg. 



46 (41) One toe Monostyla Ehrenberg. 



Many species. 



Representative species (Fig. 894) . . Monostyla limaris Ehrenberg. 



47 (32) Lorica undivided, of a single piece 48 



48 (51) Lorica somewhat pipe-shaped, often unsymmetrical. 



Family Rattulidae . . 49 



Lorica closed all around, cylindrical, fusiform, ovate, or conical, with an opening at each end 

 for head and foot; often unsymmetrical and with oblique ridges or furrows. Toes bristle- 

 like; sometimes equal, then short; sometimes very unequal, so that but one is noticeable, this 

 then very long. 



49 (50) Toes equal, or, if unequal, the shorter one more than one-third the 



length of the longer Diurella Bory. 



Many species. 



Representative species (Fig. 895) Diurella sulcata '^enmn^s,. 



(Fig. 862, page 562) D. tigris Miiller. 



50 (49) Toes unequal. The smaller less than one-third length of longer. 



Rattulus Lamarck. 



Many species. 



Representative species (Fig. 896). . . . Rattulus cylindricus Imhoi. 

 (Fig. 897). . ... R. latus Jecmings. 

 (Fig. 898) R. longiseta Schrank. 



51 (48) Lorica not pipe-shaped. Symmetrical 52 



52 (59) Foot and toes not exceptionally long. No spines. 



Family Coluridae . . 53 



Lorica of a single piece, either covering both dorsal and ventral surfaces, or only the dorsal. 



53 (58) Head surmounted by a chitinous shield 54 



