160 DESCRIPTION OF [Pob/gastrica. 



the animalcule, the female being apparent in the mass 

 of green ova, which gives the colouring to the creature. 

 The double proboscis is used as an organ of locomotion, 

 and the bright red eye affords the usual evidence of the 

 existence of a system of sensation. Self- division in the 

 transverse direction, somewhat modified, has been ob- 

 served to take place. 



137. Chlorogonium euchlorum. The beautiful green 

 Chlorogonium. — Body spindle-shaped, very pointed at both 

 extremities; tail short; colour a sparkhng green. The 

 eye of this animalcule, although distinctly marked, is, 

 nevertheless, so delicate, that it may be easily overlooked ; 

 but when the creature is dried upon a plate of very clear 

 glass, both the eye and the double proboscis are readily 

 seen, and may be well preserved as a permanent micro- 

 scopic object. Group 79 represents six creatures in one 

 cluster, each with its double proboscis ; above them is one 

 about to self-divide into three ; and on the right of this 

 are three young animalcules. Found in water-butts, &c. : 

 on ponds it forms the green matter of Priestly. Length 

 l-1150th to l-280th, exclusive of the talk 



Genus XXXVI. Colacium. The friends? of the 

 Water Flea. — ^This genus is characterized by the creatures 

 belonging to it being endowed with a single eye, and 

 attachnig themselves to other bodies by means of a 

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

 act of self-division. The usual locomotive proboscis has 

 not been defined in this genus, although, as Ehrenberg 

 remarks, there can be no doubt of its existence, by the 

 currents which are visible in coloured water near the fore- 

 part of the body. This motion of the water being rather 



