Their Collection and Investic/ation. 49 



further time to the study the number of known varieties has 

 been augmented by me to Uttle less than fifty. As shown in 

 the drawings of the species herewith submitted, ^ the group 

 abounds with forms which vie with, or even excel, in beauty 

 and elegance of design the Peritrichous Vorticellidse, whose 

 dendritic colony-stocks and flask-hke lorica? are moreover here 

 reproduced, or more correctly pretypified, in bewildering 



variety. 



In the third group of the Flagellata that has to be enume- 

 rated, differentiation has so far progressed that a distinct 

 oral aperture is in all instances present. To this higher 

 order, that may be appropriately distinguished by the title 

 of the Flagellata-Eustomata (or " True-mouthed Monads "), 

 belong especially the comparatively large Eiuileim, whose 

 cloud-like multitudes, taken together with then: briUiant 

 colour, frequently constitute a conspicuous and important 

 element in the superficial strata of our road- side ponds and 

 ditches. In addition to the three typical flagellate orders 

 already cited, there yet remain two or three numerically 

 small series which connect these typical orders with either 

 the class Cihata, or with lower groups of the Protozoa. 

 In this manner the order Cilio-Flagellata, as typified by 

 Peridinium and its allies, directly connects the two classes of 

 the Flagellata and Ciliata, its representatives possessing a 

 conspicuous girdle of locomotive ciha in addition to a flagel- 

 liform appendage. The two small orders of the Rhizo- 

 Fiagellata and Radio-Flagellata, as instituted by myself, 

 contain as yet but a few obscure forms (e.g. Reptomonas, 

 Rhizomonas, and Actinomonas), which connect in a similar 

 manner the typical Flagellata with the lower groups of the 

 Protozoa, known as the Rhizopoda and Radiolaria. 



A general outline of the limits of the Infusorial series 

 being included in the foregoing remarks, a few of the more 

 favourable conditions under which these microscopic organisms 

 may be successfully sought for and studied may now be indi- 

 cated. The most attractive and prolific hunting ground for 



1 [Being duplicates of plates illustrating the treatise, ' A Manual of the 

 Infusoria' (Bogue), by the author, now in course of publication.— Ed.] 



F 



