272 ORDER FLAGELLATA-PANTOSTOMATA. 



species in an intermediate or semi-erect condition under Ehrenberg's name oiEpistylis 

 vegetans. 



Anthophysa socialis, From. sp. Pl. XVIL Figs. 9-1 i. 



Bodies broadly ovate, abruptly truncate anteriorly, attached in clusters 

 of about eight zooids only to the extremity of a simple, thick, and evenly 

 granular pedicle. Length of separate zooids 1-3000"; height of supporting 

 pedicle i-iooo" to 1-750". 



Hab. — Fresh water, on Confervse. 



The above specific title is adopted for the distinction of the flagellate organism 

 imperfectly figured and described by De Fromentel * under the name of Fyaio- 

 bryon socialis. Biitschli has already proposed to identify it with Anthophysa vegetans, 

 but the more broadly ovate contour of the animalcules, which exhibit a perfectly 

 straight instead of an obhquely truncate anterior border, added to the simple and 

 coarsely granular character of the supporting pedicle, distinguish it in a marked 

 manner from that species. The presence of the secondary and shorter flagellum 

 characteristic of the present genus, was not recognized by De Fromentel ; the 

 magnification of 400 diameters only, employed by him in his examination of this 

 and kindred Flagellata, being inadequate for its detection. The form figured by the 

 same writer at pl. ix. fig. 11 of the work quoted, and referred with some doubt to 

 the present type, is evidently a young colony of Codosiga botrytis. Biitschli's repre- 

 sentation of Anthophysa vegetans, reproduced at Pl. XVIL Fig. 11, is apparently 

 identical witli the present animalcule and can certainly not be accepted as a typical 

 example of the last-named species. 



Genus V. CEPHALOTHAMNIUM, Stein. 



Animalcules obliquely pyriform, attached in groups to the extremities 

 of an erect, rigid, hyaline and homogeneous, more or less extensively 

 branching pedicle or zoodendrium ; flagella two in number, one long and 

 one short ; endoplast and one or more contractile vesicles usually con- 

 spicuous. Inhabiting fresh water. 



The representatives of this genus while corresponding, in the form and structure 

 of the individual monads and their mode of groupment, with those of Anthophysa, 

 are to be distinguished from them by the stiff, hyaline, and homogeneous composi- 

 tion of the supporting pedicle. 



Cephalothamnium caespitosa, S. K. sp. 

 Pl. XVIL Figs. 27-32, and Pl. XVIIL Figs. 33-35. 



Animalcules somewhat variable in shape, mostly irregularly and obliquely 

 pyriform, attached in clusters of from two or three to as many as six or eight 

 to the summit of a simple or sparsely divided pedicle ; pedicle rarely 

 exceeding the height of the individual animalcules. Length of separate 

 bodies 1-5000". 



Hab. — Fresh water, attached to a species of Cyclops. 



This animalcule was first figured and described by the author under the title of 

 Anthophysa ccEspitosa in a communication made to the Linnean Society in June 

 1877, ^'^^ h'^^ more recently received, at the hands of Stein, the name of Cephalo- 



'M 



icrozoaires,' pp. 212 and 337, pl. ix. fig. 10, and xxvi. fig. 9. 



