306. Vorticella Fraxinina.
V. gregaria, cylindracea, oblique truncata, ciliis bigeminis, apice margine fissa. Gregarious cylindrical vorticella, obliquely truncated, with two pair of cilia, and a fissure or notch at the upper edge.
The greater part of the body is cylindrical; the hinder-part rather tapering, and filled with opake molecules; towards the upper end it is transparent; within the edge, at the top are two small tubercles, from each side of which proceed a pair of small hairs.
307. Vorticella Crategaria.
V. composita, floribus muticis globosis; tentaculis binis, stirpe ramosa, [Plate XXII.] Fig. 40. Compound, with globous naked florets, two tentacules, and a branched stem. For an ample description of this animalculum, see [page 400].
308. Vorticella Hamata.
V. bursæformis, margine aperturæ aculeis rigidis. [Plate XXVII.] Fig. 40. Purse-formed; the edge of its aperture or mouth set with rigid points.
It is not ciliated, nor have any hairs been discovered upon it; the body is granulated, the fore-part broad and truncated, the hinder-part obtuse, and capable of being contracted or extended. a, the rigid points.
309. Vorticella Crateriformis.
V. subquadrata, ciliorum fasciculis etiam postice. [Plate XXVII.] Fig. 40, 41. Approaching somewhat to a square figure, with fascicles of cilia even at the hinder-part.