SCIEXCE-GOSSIP. 



307 



BRITISH INFUSORIA. 



By E. H. J. Schuster, F.Z.S. 



Part I. — Flagellata Eustomata. 



T"HE order Flagellata Eustomata comprises 

 those infusorians which possess one or more 

 flagelliform appendages, but no cilia, having 

 invariably an oval aperture or cytostome more 

 or less conspicuously developed. Reproduction is 

 brought about by longitudinal or transverse fission, 

 or by division of either the whole or part of the 

 body substance into sporular elements. This 

 latter form of reproduction, namely the formation 

 of spores from a part only of the body substance 



Entisiphon. In some instances this outer case may 

 become so hardened as to form a veritable cuirass. 

 I have often come across this " exoskeleton " of 

 Phacus from which the animal has been macerated 

 away, lying among conferva;, colourless and 

 hyaline, but retaining exactly the contours pre- 

 sented by the living animal. 



The development of a mouth seems to be 

 causally related with this hardening of the external 

 protoplasm, as the animals in question might 



Infusoria x 260 (approz.). 



- -• "'"-I'-tu '..»». 1 .rpusclesji r contractile vacuole ; 



D, fc, /'/uuiu tmguaudlu; F, P. triquctcr, x 700. 



of the parent, is exemplified in the Euglenidae, 



■ t-li'lae and Ani.tonemidae, and 

 to a comparatively high organization. This 

 cbara- tea if taken alone, would be 



enough to place the Flagellata ita on a 



ellata I'antostomata, in 

 life of the parent is invariably 

 **c' f: f the children, in 



a moil brutal and primitive manner. 



The body -'.mala is markedly dl 



into an external and internal sarcode layi 



■ ■ 

 Mien has the alii , ir.c of true 



M 



otherwise find it somewhat difficult to obtain 

 nutriment. 



The following species described are of course 

 but a very small number ol those which may be 

 met with, but they seem to me to be the commonest. 

 I have 1 them from ponds and diti hi a neat 



nth, Wimbledi n, G dalraing, Folkestone 

 ! They all belong to the family 

 Euglenidae, and 1 , m ,i phatut. 



a very COS- 



, ■ have 1 failed to 



find it in .. in. ii 1 supposed 



■in Ii Tha hen 1 Ined a 



■ 1 ealci bleb, was labelled 



