600 DESCRIPTION OF \Polygastrica. 



Polygastric cells are distinct, as also vesicles containing a beautiful 

 rose-coloured digestive fluid ; the mouth has a hollow cylinder of 

 wand-like teeth. Minute green ova granules (?) and a large oval 

 bright central gland represent the propagative organs. Self-division 

 unknown. 



Chlamidodon mnemosyne. — Body flat, elliptical, sometimes di- 

 lated anteriorly, as shown at fig. 349. It is of a clear green or 

 hyaline hue, with brilliant rose-coloured vesicles ; delicate longitu- 

 dinal lines are seen upon the surface of the animalcule, and appear 

 to be on the lorica. Ehrenberg counted sixteen wand-like teeth 

 disposed cylindrically. The movement is quick and powerful, as 

 in Euplotes. Found with Zostera and Scytosiphon. Size l-570th. 



Genus Euplotes. — The skiff-lihe or boat Animalcules possess 

 cilia, styles, and uncini, which are powerful locomotive instruments, 

 but no teeth. Polygastric cells have been filled in four species with 

 coloured food ; in the others bright vesicles evidence them ; the 

 termination of the alimentary canal is indicated in one species by 

 the discharge, in the rest by the projecting little shield ; the 

 digestive juice is colourless ; the propagative organs are probably 

 double in seven species, in one completely so. White ova are seen 

 in four species ; oval or round simple glands exist in three ; a 

 single contractile vesicle in five ; and in a sixth two vesicles are 

 observed. Self-division, transverse and longitudinal, has been 

 observed in one species, and transverse only in two or four 

 others. 



'Ei. patella. — Lorica large, nearly circular, slightly truncated 

 anteriorly ; margin transparent, broad ; back elevated, gibbous, 

 and covered with a few delicate smooth striae. The mouth is 

 ciliated on each side, the oesophagus is near the side, lower than 

 the middle, the discharging orifice behind the base of the styles. 

 Found with Lemna. Size 1 -280th. 



E. Charon {Trichoda Charon, M.) — Lorica small, ovato-elliptical, 

 slightly truncated anteriorly, and having granular striae on the 

 back ; twenty to forty cilia were counted by Ehrenberg, but no 

 setse ; white ova, propagative glands, and a contractile vesicle, have 

 been seen. Figs. 350 — 353 represent difierent views. Found in 

 standing water and infusions. Size 1-1 150th to 1 -280th. 



