546 DESCEIPTION OF \^Polygastrica. 



the body is attached to the interior of the lorica by a flexible pedicle 

 (somewhat similar to the clapper of a bell.) The organs of locomotion 

 are a wreath of cilia and an elastic pedicle ; the mouth serves both 

 as a receiving and discharging oiifice ; and stomach cells, traces of a 

 yellowish ova cluster, are more or less visible ; self-division was 

 known to Miiller. 



TiNTiNNTJS i7iqi(ilintis. — Body hyaline or yellowish coloured ; lorica 

 cylindrical, glass-like, bell-shaped. (See group 255.) Length of body, 

 without the stalk, l-570th ; with, l-240th. In sea-water on Algte. 



T. sululatus ( Vorticella vaginata, M.) — Body hj-aline, lorica conical, 

 with a posterior subulate elongation. Ehrenberg observes, that if this 

 elongation or pointuig of the lorica should be called a stalk, we should 

 require a new generic name for the animal. Length of lorica 

 l-90th. 



T. cothurnia. — Body hyaline, lorica cylindrical, hyaline, indistinctly 

 annular; rather attenuate and truncate posteriorly. Size 1 -440th. 

 In the Baltic. 



T. campanula. — Body hyaline, lorica widely campanulate, dilated 

 in front, pointed behind. Size 1 -290th. In North Sea and 

 Baltic. 



T. denticulatus. — Lorica cylindiical, hyaline, sculptured with 

 oblique rows of dots, front margin acutely dentate ; posterior ex- 

 tremity pointed. Size 1 -220th. In the North Sea. 



Genus Yaginicola.. The Sheathed little lell Animalcules com- 

 prehend Ophrydina, distinguished by divisibility of the body, but not 

 of the lorica, and neither of the two pediculated ; a wi'eath of cUia 

 surrounds the truncated frontal portion, within which, at the margin, 

 is the orifice or mouth. The polygastric apparatus, the passage of 

 the food onwards, its return, and the exit of the refuse near the 

 mouth, have been seen by Ehrenberg. One species (V. crystaUina) 

 has coloured ova granules. No other reproductive organs have been 

 observed satisfactorily. Increase by longitudinal self-division has 

 been seen in all the species. 



In all the particulars of internal organization, says Dr. Steia 

 (Archiv. fiir Naturgeschichte, 1849), Vaginicola XQ^emhlQ^ VorticeJla, 

 except that its nucleus is discoid, not band-shaped, as in the latter. 

 Propagation by fission and gemmation is likewise very distinct ; by 



