604 DESCRIPTION OF . {^Rotatoria. 



Length 1-8 12th. Appears the same as the Trichoda acada of 

 Miiller, but not as its supposed synonyme Oxytricha cicada (Ehr.) 

 which is like the Coccudina costata rather than C cicada. 

 CoccuDiNA (?) cimex = Stylonychia eimex (Ehr.) 

 C. reticulata — a name provisionally applied to an animalcule 

 found in the Seine, having a granular and reticulated surface, and 

 large cirrhi at each end. Length 1 -.578th. 



The genus Aspidisca (Ehr.) should, Dujardia believes, be num- 

 bered among the Coccudina. 



Class II.— ROTATORIA. 



Those infusorial animalcules which are included under the great 

 division Rotatoria are distinguished by being destitute of a true 

 nervous system, and of vascular pulsation ; by possessing a simple 

 tubular alimentary canal, a definite form of body, (that is, not 

 alterable by the formation of gemmae, or spontaneous division, as in 

 the Polygastrica ;) by being androgynous, or hermaphrodite ; pro- 

 vided with rotatory organs, and, though destitute of true articulated 

 feet, often with a single false foot, or pediform process. 



The magnifying power most useful for the examination of the 

 Rotatoria is 200 ; and with a power of 400 times, all that has been 

 discovered in their internal organization (except in one or two cases) 

 may be seen. 



The following table represents the analysis of the class Rotatoria 

 into families : — 



( margin of cilia wreath r iUoricated Icthydina. 



I entire. J 



With a simple Holotrocha. L loricated Oecistina. 



continuous wreatli / 

 of cilia \ 



(MoNOTROcnA.) margin of cilia wreath r illoricated Megalotrochaea, 



/ lobed or notched. "! 



(. Schizotrocha. <■ loricated riosciilaria. 



with the cilia wi-eath r illoricated Hj'datinea. 



divided into several 



atli r 

 -al ■{ 

 ha. L 



{ 



With a compound ^ series. I'oltjlrocha. L loricated Euchlanidota. 



or divided wreath 

 of ciha 



(SOROTEOCHA.) / with the cilia wreath (-illoricated Philodinaea. 



divided into two scries. 



Zygolrocha. L loricated Brachiouaea. 



