Ophrydina.} THE INFUSORIA. 275 



serves both as a receiving and discharging orifice; the 

 stomach-cells, as well as traces of a yellowish ova cluster, 

 are more or less visible ; self-division was known to Miiller. 



421. TINTINNUS inquilinus. The cylindrical Tintinnus 

 has an hyaline or yellowish coloured body, with a cylindrical 

 glass-like, bell-shaped lorica. (See group 255.) Length of 

 body, without the stalk, l-570th; with, l-240th. 



422. TINTINNUS subulatus (Vorticella vaginata, M.) 

 The pointed Tintinnus has an hyaline conical lorica, with a 

 posterior subulate elongation. Ehrenberg observes that if 

 this elongation or pointing of the lorica should be called a 

 stalk, we should require a new generic name for the animal. 

 Length of lorica l-90th. 



Genus XCVII. VAGINICOLA. The Sheathed little 

 bell Animalcules comprehend Ophrydina distinguished 

 by divisibility of the body, but not the lorica, and neither 

 of them pediculated ; a wreath of cilii surrounds the trun- 

 cated frontal portion, within which, at the margin, is the 

 orifice or mouth. The polygastric apparatus, the passage 

 of the food onwards, its return, and the exit of the refuse 

 near the mouth, have been seen by Ehrenberg. One species 

 (V. crystallina) has coloured ova granules. No other re- 

 productive organs have been observed satisfactorily. 

 Increase by longitudinal self-division has been seen in all 

 the species. 



423. VAGINICOLA crystallina (Vorticella stentorea et 

 Trichoda ingenita, M.) The crystalline Vaginicola. 

 Lorica crystalline, straight, pitcher-shaped, slightly con- 

 tracted near the open end ; ova green. Found upon 

 lemna, &c. Length of lorica l-210th. 



424. VAGINICOLA tincta. The brown Vaginicola. 



T 2 



