as Infusoria flagellata. 209 



each other, at or about the middle of the body. When fully 

 expanded, they are from one-fifth to one-fourth the diameter 

 of the monad, and have a perfectly globular shape. In ap- 

 pearance, and manner and rate of systole and diastole, they 

 resemble those of Codosiga so closely that the former might 

 be substituted for the latter with scarcely a chance for a detec- 

 tion of the change. As the rate of systole of each vesicle, 

 which is once in half a minute, was observed directly through 

 the undisturbed layers of the colony, and moreover at the edge 

 of the ostioles, there need be no hesitation in accepting the 

 record as that of the normal measure of pulsation. 



§ 11. Anthophysa MuUert, Bory. PI. VI. figs. 47-61 ; 

 PI. VII. figs. 62, 63. 



A description of this infusorian, but without illustrations, 

 has already been published in the 'Annals ' for December 1866. 

 In order to carry out the object of this memoir to its fullest 

 extent, I propose here to make quite large extracts from this 

 paper, and also to add a number of figures, both for the better 

 understanding of the character of the animal and for the sake 

 of comparison with others which are illustrated in the accom- 

 panying plates. 



The mononematous Flagellata which are described in the 

 foregoing pages (§§ 1-10) are connected with the lietero- 

 nematous forms through two diverse lines ; or, rather, they are 

 closely allied to two different types of diversiflagellate Infusoria, 

 of which Anthophysa is an example of one type, and Anisonema 

 (§ 13) a representative of the other — both of the flagella of the 

 former being proboscidiform, and, of the latter, one being 

 gubernaculiform and the other proboscidiform. The intimate 

 alliance of Anthophysa with Monas may be best expressed by 

 saying that the former is a Monas modified by the addition of 

 a comparatively minute cilium^ which is affixed to the head 

 near the Jlagellum. 



Anthojyhgsa Miilleri, Bory {Epistylts? vegetans, Ehr.), is 

 quite common among freshwater plants, such as Myriophyllum^ 

 Ceratophyllum, and Utricidaria, and adheres to their filiform 

 leaves like an irregular, floccose, brownish deposit. 



" Under a low magnifying-power this floccose matter appears 

 to consist of clusters of very jagged, irregularly branching and 

 contorted, semitransparent, intertwined stems, and projecting 

 tapering and flexible twigs (pt?)- Each of the tips of the 

 latter sustains a single, more or less globose mass of spindle- 

 shaped bodies {md), which radiate from a common centre of 

 attachment, and are kept in a constant agitation by the spas- 

 modic jerks of a long, stout, usually rigid, arcuate filament (/), 



