100 Dr. A. C. Stokes on some 



monadidse of Saville Kent, immediately preceding SpJmiomonas, 

 from which it is exchided by its smoothly rounded surface 

 and the position of the short flagellum, which, although vibra- 

 tile, is more or less trailing, and habitually held beneath the 

 body. Several individual animalcules have been observed 

 with a bulbous enlargement to the distal extremity of the long 

 flagellum. 



Cyclanuka*, gen. nov. 



Animalcules free-swimming, persistent in shape, compressed, 

 the posterior extremity evenly rounded, and never exhibiting 

 a caudal prolongation ; otherwise as in Phacus. 



This Infusorian, which is Phacus without the caudal pro- 

 longation, bears the same relationship to that genus as Euglena 

 to Amblyophis. 



Cyclanura orhiculata, sp. nov. (PI. I. fig. 4.) 

 Body ovate or suborbicular, thick, compressed, scarcely 

 longer than broad, having an excentric, longitudinal, keel- 

 like elevation across the right-hand side ; frontal border con- 

 spicuously emarginate ; cuticular surface longitudinally striate ; 

 colour grass-green ; endoplasm enclosing a spherical, poste- 

 riorly located amylaceous corpuscle ; contractile vesicle ante- 

 riorly placed, in close proximity with the red pigment spot. 

 Length of body -lo inch. 

 Hab. Stagnant pond-water. 



This rather peculiar form would seem to be foreshadowed 

 by Phacus acuminatus, Stokes t, in which it is only necessary 

 to suppress the short, straight, and sliarply-pointed caudal 

 prolongation, to have essentially the infusorian here described. 

 'J' he latter is, however, nearly twice as large as Ph. acumi- 

 natus, and its body is very much thicker and stouter. It is, 

 indeed, more robust in every particular than any previously 

 recorded species of the genus. This peculiarity is conspicu- 

 ously apparent. 



Ghrysopyxis urceolata, sp. nov. (PL I. fig. 5.) 



Lorica urceolate, less than twice as long as broad, widest 

 anteriorly, ta]iering posteriorly to an obtusely rounded point 

 of attachment, the margins then convex ; or with nearly 

 straight lateral borders and an acute point of attachment; 

 narrowed anteriorly and prolonged as a short, truncate, neck- 

 like portion with slightly converging margins ; animalcule sub- 

 spheroidal, occupying the centre of the lorica, to v/hich it is in 



* KviCKas, round ; a, privative; ovpd, tail. 



t ' American Monthly Microscopical Journal,' Oct. 1885. 



