292 Transactions of the Society. 



lip high, meeting in middle. Antenna short. Jaw with very tin b 

 bolder, teeth 3 3. Rump usually wider than central trunk, rounded 

 posteriorly. Foot short, spurs small, acuminate, divergent, no inter- 

 space. 



Length, when feeding, 450 yu, width of corona and collar about 

 70/jl, neck DOfi, trunk 90//, rump 70/t, across spurs 25//. The 

 characteristic form of the head is that shown, but the discs are 

 sometimes held further apart, and the lobes of the upper lip 

 slightly separated. The bulging anterior trunk and contracted 

 central trunk are habitual, though 1 am unwilling to make such 

 things specific characters. Central trunk and pre-aual closely 

 plicate ; pre-anal and anal not distinguishable in the outline, but 

 perhaps separated by dorsal fold. 



Nearest M. symbiotica, it differs more in general form than in 

 detail. It lacks the red colour of symbiotica. The rump and 

 upper lip are of different form. It is not stout. It often swims 

 free. 



Habitat. — lioeky Mountains ; abundant. 



Habrotrocha microcephala (Murray). 



Habitat. — Lake of the Woods. The first time the species lias 

 been found outside of Britain. 



Habrotrocha maculata sp. n. Plate VIII. figs. 12a-12d. 



Specific characters. — Small, whitish ; trunk stippled with large 

 pellucid dots ; corona small, less than collar and neck ; prominent 

 flaps at side of mouth ; lamella? large ; antenna very short ; teeth 

 three or four in each jaw ; foot short, 3-jointed ; spurs small, 

 acuminate, divergent, no interspace. 



Length, when feeding, 250 //, width of corona 28 //, mouth flaps 

 40/*, neck 30//, trunk 90//,, across spurs 24//. Discs close together; 



KXPLANATTON OF PLATE VIII. 



Fig. 11a. — Callidina asx>crula sp. n. Feeding. 



,, 116. Ditto. Creeping. 



,, lie. Ditto. Jaw. 



„ lid. Ditto. Egg. 



,, He. I >itto. Side view of foot. 



„ 11/. 1 >itto. End view of foot. 



,, Via. — Habrotrocha maculata sp. n. Feeding. 



,, 126. Ditto. Creeping. 



,, 12c. I >itto. Side view of head. 



,, 12d. Ditto. Jaw. 



,, 13a. — Mniobia obtusicomis sp. n. 



., 136. Ditto. Jaw. 

 13c. Ditto. Foot. 



,, V3d. Ditto. Spurs and disk. 



,, 14a. — Mniobia montium sp. n. 



,, 146. Ditto. Jaw. 



