Euchlanhluta.'] iNFrsoniAL animalcules. 659 



just behind tlic ccsophagiis, may be only a tremuloits condition of an 

 interual fold of the stomach. The only evidences of a nervous system 

 are the eye and the long ganglion which supports it. 



DiNocHAKis pocilhim {Trichoda pociUum, M.) — Lorica nearly cylin- 

 drical ; two long spines at the base of the foot ; toes three ; it has a slight 

 dorsal ridge. Figs. 454, 455, represent this creature in different 

 positions; and fig. 456 the a3sophageal head. Found amongst Cera- 

 tophyllum, &c. Length 1 -120th. 



D. tetmdis. — Lorica acute, triangular; horns two, at the base of 

 the foot; toes two. This species has longer toes than the others 

 and the body is comparatively shorter. Found with Lemna and 

 Ccratophyllum. Length 1 -120th. 



D. paupera. — Ijorica acute, triangular ; horns two, at the base 

 of the foot, scarcely perceptible ; toes two, short. Length l-120th. 



Genus Moxtjra. The stylifonn-footed Rotatoria. — Eyes two, 

 frontal ; foot simple, stj'liform. The lorica is somewhat compressed 

 and open upon the ventral surface : anteriorly is a hook- like process, 

 which can be withdrawn. In one species the vibratile organ has 

 four to six muscular bulbs ; in both an 03sophagoal head, with two 

 jaws toothed, a very short oesophagus, and a simple alimentary 

 canal, with two spherical glands, are observed ; an ovarium, with a 

 single large ovum, and, in one species, the vesicle of the germ, have 

 been seen. The eyes are red, moveable, and seated upon nervous 

 masses. The species are not only difficult to distinguish from each 

 other, but also from the genus Colurus; the toes of the latter ap- 

 pearing single until pressure is used. 



M. colurus. — Lorica oval, obtuse, obliquely truncated posteriorly, eyes 

 near to each other. Lorica l-280th. Siberian specimens, l-400th. 



M. dulcis. — Lorica ovate, anteriorly acute, posteriorly obliquely 

 truncate ; eyes distant from each other ; the alimentary canal is often 

 filled with green matter. Tliej'- increase rapidly in glass vessels. 

 Figs. 457 to 459 represent three views of this animal. Found 

 amongst Conferva. Length of lorica l-288th. 



The two species of Ilonura are referred by Dujardin to Colurus, 

 or, to adopt his appellation, to Colvrella. 



Genus CoLtiiiFS. The pincer-footed Rotatoria have two frontal 

 eyes, a fui-cate foot, and a compressed or cylindrical lorica. The 



