Truc/ielina.] infusorial animalcules. 573 



others in his fumily Kolpodca ; wliilst tlie closely allied genera 

 Kondylostoma and Plagiotoma are confounded with other families ; 

 the former with Oxytricha, the latter with Paramecium. 



"Moreover, the obliquity of the mouth in Bursaria is not a suffi- 

 cient distinction between that genus and Leucophrys ; and whilst 

 assigning a large mouth to Bursar ia, he includes among them several 

 species in which the existence of a mouth, to say the least, is 

 doubtful." 



Dujardin creates a family ' Bursarihis,'' which he divides into five 

 genera, viz., Plagiotoma, Ophryoglena, Bursa/ria, Spirostomum, and 

 Kondylostoma. 



The fii'st new genus Plagiotoma, is characterized by being much 

 flattened, or lamellar ; ciliated, and parasitic, and appears corres- 

 pondent with the Paramecium compressum of Ehrenberg. The other 

 new genus, Kondylostoma has an elongated compressed form, with a 

 large lateral mouth and marginal cilia ; = Oxytricha caudata. Ehr. 



(«.) Sub-genus Buesakia. — The inferior {not anterior^ lip Teaching to 

 the frontal margin. 



BxjusAEiA truncatella (M.) The tnmcated Bx(/rsaria. — Body large, 

 white, ovate, turgid, truncated, and broadly excavated in front, where is 

 a simple row of cilia. In some specimens, Ehrenberg saw half-digested 

 llotiferae, and large quantities of vegetable matter in the nutritive 

 cells, and was able to see the canal fill itself with carmine, but could 

 not follow the whole course of it. In each cell the food is surrounded 

 by a clear fluid, which Ehrenberg calls bile. A large bright bladder 

 is seen below the mouth, and somewhat to the left of it, on which 

 side is also a large curved but not articulated gland, reaching to the 

 brow or front. They are visible to the naked eye. Pound in ditches, 

 in woods, amongst rotten beech leaves. Size l-48th to l-36th. 



B. vorticella. — Body white, large, nearly spherical, and turgid ; 

 anteriorly truncated, and widely excavated, with a double row of 

 cilia. Found with Chlamidomonas puMsculus and Goniuni pectoralc, 

 some of which are seen within it in fig. 294. Size l-108th. 



B. vorax. — Body large, oblong, rounded at the ends ; mouth ample, 

 being one third the length of the body, and touching the summit of 

 the frontal region. This species has great resemblance to Urostyla 

 grandis and Stylonychia lanceolata, when their claws and styles are 



