602 



Microscopical Essays, 



268. Kerona Vannus. 



Kerona ovalis, fubdeprelfa, margine altero flexo, oppofito cili- 

 ato, corniculis anticis, fetifque pofticis. Oval and rather flat 

 kerona, one edge bent, the oppofite edge ciliated, the front fur- 

 nifhed with horns, the hinder-part with briftles. 



269. Kerona Pullafler. Fig. 24 and 25, Plate. XXVI. 



Kerona ovata, antice fmuata, fronte creftata, bafi crinita. 

 Oval, the fore-part finuated, a creft on the front, the bafe hairy. 



It agrees with the trichoda pulex in many particulars, but the 

 upper part is pellucid, without any black molecules, the front 

 truncated, the whole fuperflcies of the head covered with hair, 

 and the fore-part fmuous. a the horns, b the hairs at the hinder- 

 part, c the cilia of the front* 



270. Kerona Mytillus. Fig. 29, Plate XXVI. 



Kerona fubclavata, utraque extremitate latiori, hyalina ciliata. 

 Rather clubbed, broad at both extremities, clear and ciliated. 



A large animalculum, the fore and hind-part rounded, very 

 pellucid and white, dark in the middle, with black inteftines, in- 

 termixed with a few pellucid veficles. Both extremities feem as 

 it were compofed of two thin plates. The fore-part is ciliated, 

 the hairs fhort, lying within the margin; it is alfo ornamented 



' , with 



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