Enchelia.'] infusorial animalcules. 565 



Amongst Conferva in turf pools. Length l-72nd; ova granules 

 1 -2400th. 



Pkokodon teres. — Body ovate, cylindrical, (fig. 282); colour white; 

 circlet of teeth cylindrical. Ehrcnbcrg counted twenty teeth ; when 

 broken up, forty-five. In swimming it revolves upon the long axis 

 of the body. Size l-140th. 



P. viridis. — Body large, elliptic, compressed, green, with a nearly 

 cylindrical crown of teeth. Size 1-1 20th. Berlin. 



Besides the new or newly-styled genera of the family Enchelia, we 

 have yet to append some genera (whose affinity is with the foregoing) 

 described by Dujardiu in his family ' Enchelyens,' called by him 

 Acomia Gastrochceta, Alyscum, and JJronema ; and which, with the 

 genus Euchelys, constitute the family Enchelyens. 



The Acomia and Gastroclmta are only ciliated partially, the former 

 at one end, the latter along a longitudinal furrow on the under surface; 

 whilst EncliehjSj Alyscum, and Uronema, are ciliated throughout ; 

 the first ha%T.ng but one form of cilia ; the second, cilia, together with 

 some long, contractile, trailing filaments ; and the last, cilia, with a 

 single, straight, and long posterior filament. 



The Enchelyens are found in infusions, or in stagnant water. 

 Genus Acomia. — Body oval or irregular, oblong, colomiessor cloudy, 

 formed of a homogeneous, glutinous substance, containing unequally- 

 sized granules, and ciliated at one end. No mouth. 



A. cyclidium. — Body oval, oblong, depressed, containing large 

 granules and some vacuolse ; dividing transversely. In external 

 form approaches Cyclidium (Ehr.) Marine. Size l-650th. (P. 21 

 f. 16a, b.) 



A vitrea. — Body ovoid, in part crystalline, rendered cloudy by 

 gi-anules in its posterior half ; anterior border ciliated ; division, 

 longitudinal. Size l-1250th. In fetid water. (P. 21, f. 17). 



A. ovale. — Differs from the preceding by the granules occupying 



the anterior half, and by its length, l-868th. In fetid marsh water. 



A. ovulum. — Body ovoid, presenting a nodular or granular portion, 



which seems to contract itself within the interior af a diaphanous 



envelope. Revolves in moving. Length 1 -300th. 



Its motion was that of a Doxococcus. 



A. (?) vorticella. — Body ovoid, nearly globular, colourless, cloudy ; 



