Hydalinaea.] THE INFUSORIA. 371 



a ball; male contractile vesicles are observed in four 

 species ; sexual glands in three. No species is viviparous ; 

 none carry their egg hanging to them : transverse vessels 

 are seen in three species, and in one a vascular net-work 

 at the head ; tremulous gills are found in three species, in 

 two of which they are evidently attached to the sexual 

 glands. The nervous system is more especially developed 

 in D. lacustris, but indicated in all the species by the 

 coloured eyes. 



628. DiGLENA lacustris. The lake Diglena. — Body 

 stout, oval, crystalline ; the front straightly truncated ; 

 foot suddenly attenuated, in length one-fourth of the 

 body ; the toes one-third the length of the foot. The 

 transparency of this animalcule is often a great hindrance 

 to the discrimination of its internal organs, though they 

 are very large ; the superficial skin is delicately shagreened. 

 Fig. 403 represents a side view (left) of this interesting 

 animalcule, with a Lynceus (see Microscopic Cabinet, 

 plate vii.) in its stomach ; its curious internal organization 

 is clearly depicted. Often found in green- coloured water. 

 Length l-70th. 



629. Diglena gnindis. The elegant Diglena. — Body 

 long, slender, and cylindrical, obliquely truncated ante- 

 riorly ; toes straight, longer than the stout foot. The 

 forked central sacculi, between the two ocular ganglia, is 

 remarkable. Fig. 404 represents a side view (right) of an 

 extended animalcule ; fig. 405 another, contracted, with 

 the jaws pushed out. Length l-120th to l-72nd. 



630. DiGi,^j<!A Jorcipata {Vorticel/avermicularis, Cer- 

 caria forcipata et vermicularis, M.) The bent-Jingered 

 Diglena. — Body cylindrical, slender, obliquely truncated 



2 b 2 



