270 DESCRIPTION OF [Polygastrica. 



animalcule, and a vibratile organ is observable at each 

 little head ; but whether it is a wreath of cilii, or a simple 

 proboscis, is undetermined ; if the latter, this creature 

 would belong to the Monads, where it would form the 

 type of a new genus. Found in river water. Size 

 1 -3450th ; tree l~140th. 



415. EPISTYLIS parasitica. The parasitical Epistylis 

 has a small body, conical, campanulate, and solitary ; 

 pedicle simple] and smooth. Found upon Zoobotryon 

 pellucidus. Length l-570th; with pedicle, 1-1 20th to 

 l-24th. 



416. EPISTYLIS Arabica. The Arabian Epistylis has a 

 small oval campanulate body ; pedicle but little branched, 

 smooth, and hyaline. Found in the Red Sea. Size of 

 tree, l-140th. 



Genus XCIII. OPERCULARIA. The parasol little bell 

 Animalcules have a stiff rigid pedicle, branched, from im- 

 perfect spontaneous division. The pediculated corpus- 

 cles are of different forms ; they have two lips the supe- 

 perior one, supported by a muscle, is somewhat like a 

 parasol. They may be called Epistylis with dissimilar 

 corpuscles. The organs of locomotion consist of a wreath 

 of cilii, and a long muscle within the body ; this rises or 

 depresses the frontal surface, in the form of an upper lip. 

 At the large, lateral, somewhat anterior mouth, to and 

 from which the alimentary canal is seen running, the dis- 

 charge of matter also takes place. They are hermaphro- 

 ditic ; self- division, and free separation of the body from 

 the stalk, have been observed. It is very remarkable that 

 below its proper bodies, more especially in the axillae of 

 the branches, there are seen large single bodies, and even 



