540 DESCRIPTION OF {Tolygastricct. 



ched pedicle, of a yellow colour. When the water containing this 

 species is coloured with indigo, strong ciu-rents are seen at the front 

 or head of each animalcule, caused by a \'ibratile organ, also ob- 

 servable ; but whether the latter is a wi'cath of cilia or a simple 

 proboscis, is undetermined ; if a proboscis, this creature would belong 

 to the Monads, where it would form tlie type of a new genus. Found 

 is river- water. Size 1- 3450th ; ti'ee l-140th. 



Brightwell says (Fauna Infusoria of !N'orfolk, 1848) the armed or 

 oral animalcules are furnished "with a long filament, that when the 

 water is shallow, they detach themselves, and swim about with a 

 revolving motion. The organ of motion, he states to be a long 

 filament (proboscis.) 



Episttlis j9»rfl««;Y/c«. — Body small, conical, campanulate, and solitary ; 

 pedicle simple and smooth. Found upon Zoobotryon pellucidus. 

 Length l-570th; with pedicle l-120th to l-24th. 



E. Arahica. — Body small, oval, campanulate ; pedicle but little 

 branched, smooth, and hyaline. Found in the Bed Sea. Size of 

 tree, 1-1 40th. 



E. Barha. — Body ovate, oblong, white; branches dichotomous; 

 longitudinally and regularly striated. Found on Larvae of insects. • 



E. herheriformis. — Body oblong, siib-cylindi'ical, white ; stem 

 dichotomous, articulated, and striated, its divisions dilated at their 

 apices. Found also Parasitic, Berlin. 



E. euchlora. — Body oblong, rather expanded in front, with green 

 ova; stem branching, dichotomous, 1-1 3th inch in height, smooth. 

 Parasitic, on Planorbis cornea, Berlin. 



E. pavonina. — Body very large, helmet-shaped, elongated in front ; 

 stem very high, dichotomous, striated, and hence decomposing light, 

 and displaying many hues. Often 1- 3rd inch in height. Berlin. 



Genus Operculama. The parasol little bell Animalcules have a 

 stiff rigid pedicle, branched, from imperfect spontaneous division. 

 The pediculated corpuscles are of different forms; they have two 

 lips — the superior one, supported by a muscle, is somewhat like a 

 parasol, or lid (operculum) which is a characteristic. Opercularia = 

 Epistylis with dissimilar coi-puscles. The organs of locomotion con- 

 sist of a wreath of cilia, and a long miiscle within the body ; this 

 rises or depresses the frontal surface, in the form of an uppt r lip. 



