t 



Microscopical Essays, 601 



in the hind-part, partly extended ftrait, partly bent down; the 

 motion is retrograde. It k found in water which is covered with 

 lemna. 



265. Kerona Hauftrum. 



Kerona orbiculata, corniculis mediis, antice membranacea 

 eiliata, poftice fetofa. Orbicular kerona, the horns in the middle, 

 the fore-part membranaceous and ciliated, at the hinder-part 

 there are feveral briftles. 



266. Kerona Hauftellum. 



Differs from the preceding only in having the hinder-part with- 

 out any brililes. 



267. Kerona Patella. Fig. 22 and 23, Plate XXVL 



Kerona univalvis, antice emarginata corniculata, poftice fetis 

 flexilibus pendulis. With one valve, orbicular, cryftalline, the 

 fore-part fomewhat notched, the fleffiy body lies in the middle of 

 the {hell ; above and below are hairs, or horns, of different 

 lengths, jutting out beyond the fhell, and acting inftead of feet 

 and oars, fome of which are bent ; the fuperior ones conftitute a 

 double tranfverfe row. a the fore-part, b the horns, d a lunated 

 figure in the fhell, c a pulpous body, f briftles at the hinder- 

 part. 



268. Ke- 



