Oxytrichina,.} THE INFUSORIA. 321 



544. UBOSTYLA grandis. The great Urostyla. Body 

 white, semi- cylindrical, rounded at the ends, anterior 

 slightly enlarged, hence it appears club-shaped; styles 

 short, mouth cleft, large, l-4th to l-3rd the length of the 

 body ; it has long cilii on both sides; the discharging orifice 

 has from five to eight little styles on the left side only; the 

 stomach juice is colourless. The young animalcules are 

 flatter than the old ones. Fig. 342 represents an under 

 view with glands, vesicle, and the cells filled with 

 Bacillaria and coloured matter. Currents produced by the 

 vibration of the cilii about the mouth are also indicated in 

 the drawing. Found on slimy dead sedge leaves. Size 

 1-1 44th to l-96th. 



Genus CXXIX. STYLONYCHIA. The armed Animal- 

 cules are ciliated, and armed with styles and uncini. These 

 organs of locomotion are variously disposed. In one 

 species the course of the alimentary canal, with its nume- 

 rous digestive cells, has been seen ; in the others coloured 

 food is received in the cells ; a thick granulated ova cluster 

 exists in all the species, in two of them two glands, 

 and in four^ contractile vesicles. Transverse and longitu- 

 dinal self-division in two species, transverse only in a 

 third, and in S. pustulata, the formation of gemmae, is 

 seen. 



545. STYLONYCHIA mytilus (Trichoda mytilusj Kerona 

 mytilus, M.) The muscle Animalcule. Body white, flat, 

 oblong, slightly constricted in the middle, obliquely dilated 

 anteriorly in the form of a muscle. The extremities are 

 so transparent that they give it the appearance of being 

 covered with a shield, but they are soft, flexible, and fur- 

 nished with cilii. The stomach juice is colourless, the 



