Monadina ] infusorial ANiMALcrtEs. 131 



Doxococcus ruber. — Form globular ; coloured brick red, opaque. 

 Ebreuberg appears to doubt whether this animalcule holds its proper 

 situation here, or whether it should be placed with the gen is Trache- 

 lomonas, though its motion is veiy pecidiar ; and he has not been able 

 to satisfy himself of the existence of a lorica, or shell, enveloping the 

 creature. Group 18 represents three magnified individuals. Found 

 amongst confervae, &c. Size 1-1 720th. 



D. pulvisculus. — Form perfectly (?) globular ; colour gi'een, but 

 opaque. Found amongst confervse. Size not exceeding l-1280th. 



D. tnequalis. Form irregularly globular ; transparent, and covered 

 with green spots. Found amongst confervse. Size 1 -2400th. 



Genus Chilomonas. T/te hp-monads constitute but a small genus. 

 They are characterized by the oblique position of the mouth, with 

 respect to the longitudinal axis of their bodies, which occasions an 

 overhanging or projecting form above the mouth, of a lip-like 

 appearance. All the species propel themselves in the direction of the 

 long axis of the body. Their form is invariable, and they are devoid 

 both of the eye and tail. Wliethcr the projecting lip is furnished 

 with cilia, or with a double flagelliform proboscis, Ehrenberg has not 

 satisfactorily determined. He states, however, that two proboscides 

 are to be distinctly seen on the C. Paramecium, whilst on the C. des- 

 truens there is a number of cilia, which are not quite so apparent. 

 Their self-division is either simple and complete, or they do not 

 divide. 



Dujardin's characters of this genus are, ''Animal with an ovoid 

 oblong body, obliquely notched in front, with a very slender filament 

 proceeding from the bottom of the notch. Movement from before, 

 backwards on its centre. It is with doubt that I refer the Infusoria 

 I thus name to the genus Chtlomonas of Ehrenberg. The mode of 

 insertion of the filament behind a projecting lip-like portion, ap- 

 proaches the animals to the Euglena and to certain Theca monadina,- 

 but I cannot discover any trace of an integument, either contractile 

 or resistant." 



C. volvox. — Form ovate ; attenuated and trimcated anteriorly ; 

 transparent and colourless ; projecting lip long ; they will feed on 

 indigo. Found in stagnant water. Size 1-1 440th. 



C. po/ramecium. — Form oblong, keeled longitudinally, colour re- 



