Protozoa and liotifcra at Havana, III. 359 



a firm lorica, which is open at each end, and divided 

 down the back by a fissure whose sides are united 

 by membrane ; two furcate toes always exposed. 



EuchlanicUe. Lorica of two dissimilar plates, one dor- 

 sal, one ventral, united so as to form two confluent 

 cavities, of which the upper is much the larger ; foot 

 jointed, furcate. 



Cathypnidce. Body enclosed in a lorica which is open 

 at each end, and consists of two plates ; the dorsal 

 more or less elevated ; the ventral nearly flat, the 

 two divided by a deep lateral longitudinal sulcus, 

 covered with flexible membrane ; toes two or one, 

 always exposed. 



Coluridce. Body enclosed in a lorica, usually of firm 

 consistence, variously compressed or depressed, 

 open at both ends, closed dorsally, usually open or 

 wanting ventrally ; head surmounted by a chitinous 

 arched plate or hood ; toes two, rarely one, always 

 exposed. 

 Division II. Foot transversely wrinkled, wholly retract- 

 ile, furcate or ending in a ciliated cup ; sometimes 

 absent. 



Pterodinidce. Lorica entire, various ; corona and cili- 

 ary wreath as in the Philodinida; ; trophi malleo- 

 ramate (Fig. 3, E) ; foot jointless, toeless, ending in 

 a ciliated cup or absent. 



Brachionidce . Lorica box-like, open at each end, gene- 

 rally armed with anterior and posterior spines ; foot 

 long, excessively flexible, ending in two toes. 



Anurceidce. Lorica box-like, broadly open in front, 



behind open only by a narrow slit ; usually armed 



with spines or elastic setse ; foot wholly wanting. 



IV. Order Scirtojioda. Swimming with their ciliary wreath, 



and skipping with arthropodous limbs ; foot absent. 



Pedalionidce. Arthropodous limbs six; head truncate ; 

 corona of two concave lobes ; ciliary wreath as in 

 Philodinidce ; trophi malleo-ramate (Fig. 3, E). 



