Vorticellina.'] iNFtrsoRiAl, antmalcttles. 539 



colour of its food. Fonnd upon Ceratophyllum and Nijm^ihaia, often in. 

 masses several feet long, and two to three inclies tliick ; it appears 

 like a blueish-wMte slinic, which, is easily broken up. Size l-140th. 

 to 1-1 20th. 



'EvKTYiAS favicans {V. acinosa et hellis, M.) — Body large, broadly 

 campanulate ; pedicle smooth, its branches coarctate. The branches aro 

 dilated at the axilla), and the ova are of a yellow colour. In this 

 species, the alimentary canal is very evident. Size (stretched out) 

 l-190th.,- tree 1 -9th high. 



E. leucoa ( Volvox sphcerula, M.) — Body large, broadly campanulate ; 

 pedicle erect, smooth, and articulated ; the branches capitate or 

 collected in a head ; ova white. These animalcules are convex an- 

 teriorly, have distinct ova granules, a simple wreath of cilia, and a 

 round mouth at the margin. The seminal gland is bent in the form 

 of the letter S. Size 1-1 20th; tree l-24th; ova l-5760th to 

 l-6000th; range of development, consequently, 1 -600th to l-120th. 



E. digitalis {V. digitalis, ringens et inclinans, M.) — Body small, 

 cylindrical, campanulate, dichotomous, and finely annulated. This 

 well-marked form infests the Cyclops quadricornis, drawn and des- 

 cribed in the Microscopic Cabinet. It sometimes completely envelopes 

 it. Ehrenberg says it does not appear to be deadly to it ; but I 

 consider it a disease. In the beautiful little tree this species pro- 

 duces, the Notommata petromyzon nestles just like a bird in a bush, 

 and fastens its eggs to its branches. Coloured food is readily taken, 

 and fifteen large stomach-ceils have been counted. Size 1 -430th; 

 tree l-20th. 



E. (?) nutans. — Body ovate, attenuated at both ends ; mouth dis- 

 tinctly two-lipped and prominent. The pedicle is branched and an- 

 nulated (see fig. 245 and 246 ; and P. 22, fig. 16, 22, 23.) " This 

 animalcule (says Ehi'enberg) can push forth a bladder between its 

 lips, Uke (si parva licet componere magnis) a camel can its palate-veil 

 (gaumen segel) ? " Size l-430thj tree 1 -24th. 



E. hotritis. — Body very small, ovate, crovsoied with cilia. They 

 resemble grapes upon a simple hyaline pedicle. Size 1 -2400th; 

 tree 1 -240th. (See Stein's remai-ks, p. 536.) 



E. vegetans ( Volvox vegetans, M.) — Body very small, ovate, crowned 

 with cilia (?) ; disposed in clusters, like the preceding, upon a bran- 



N N 2 



