Asiasiaea.] infusorial animalcules. 193 



pedicle or foot-stalk, which is single, or ramified by the process of 

 self-division. The usual locomotive proboscis has not been detected 

 in this genus, although, as Ehrcnberg remarks, there can be no 

 doubt of its existence, from the currents which are visible in coloured 

 water near the forepart of the body. But these being rather feeble, 

 render it probable that the organ is a single filiform proboscis. The 

 red visual point is indicative of a system of sensation, and the nume- 

 rous transparent vesicles within the body denote one of nutrition. 

 The creatures are parasitical upon Entomostraca and Rotatoria. 



Chxokogonium (?) vesiculosum. — Body of a spindle-shaped oval form, 

 but variable, with the pedicle very short, and seldom ramified ; colour, 

 sparkling green, with distinct internal vesicles. Elirenberg says, 

 " I have agaia sought in vain for the red eye (May 23, 1835), but 

 cannot be satisfied of its non-existence, as it is undoubtedly present 

 in the other species, and investigation is sometimes unproductive, on 

 account of subordinate circumstances. I have likewise failed in 

 seeing very satisfactorily the vibratory organ, notwithstanding its 

 action is evident enough." Plate 2. f. 80, represents a portion of the 

 back shield of the Cyclops quadricornis (see IIicrosco2)ic Calinet, P. 9), 

 with six of these creatiu'es attached to it ; one appears double, longi- 

 tudinal self-division having just taken place. Found upon Entomos- 

 traceans. Length l-860th. 



C. stentorinum. — Body expansible and vaiiable, somewhat cj'lin- 

 drical in form ; its fore part expanded into a cone or funnel-shape 

 process ; colour, a beautiful green ; vesicles indistinct, pedicle often 

 ramified. Found upon Entomostraceans and Pohjarthra trigla. 

 Length 1-11 50th. 



Genus Distigma. The doiible-eyed Astasia. — The characteristics 

 of this genus, are, the possession of two eyes, and a fi'eedom of motion. 

 Locomotive organs have not been hitherto discovered, and the pre- 

 sumption is, that they do not exist, as none of the species either 

 swim or produce perceptible currents in coloured water. They have 

 a sort of creeping or crawling movement, much like eels, and can 

 change their forms, after the manner of the Proteus ; they approxi- 

 mate the Amosha in other respects, besides the deficiency of the pro- 

 boscis. At the fore part of the body may be seen two very delicate 



