GENUS EPISTYLIS. 



709 



Wrzesniowski,* closely resembles that of Opercularia Lichtensteinii, and it might be 

 added, certain species of Podophrya. With the exception of E. fiavicans, it is further- 

 more the only representative of the genus Epistylis in which the pedicle is perforated 

 by a central canal ; in the present instance, however, this canal is continuous to the 

 junction of the pedicle with the body of the zooid, while in the former case it is soUd 

 both at this point and at the axes of the divergent branches. 



Epistylis balanorum, Mereschk. Pl. XXXIX. Fig. 5. 



Body subcylindrical, tapering posteriorly, about two and a half times as 

 long as broad, having a deep groove or constriction immediately beneath 

 the peristome ; the ciliary disc continued above the peristome-border as a 

 prominent, elevated, median, boss-like projection, having several annula- 

 tions around its base, and a pointed conical anterior termination ; cuticular 

 surface entirely smooth ; parenchyma finely granulate ; endoplast band-like, 

 curved ; pedicle smooth, branching in a more or less^ regular dichotomous 

 manner, bearing but a small number of animalcules. Length of zooids 

 1-240". 



Hab. — Fresh water : White Sea, attached to the embryos of Balanus sp. 



As indicated by Mereschkowsky,f the zooids of this species correspond closely in 

 the remarkable modification of the ciliary disc with the fresh-water Epistylis umbili- 

 cata of Clapar^de and Lachmann. 



Supplementary Species. 



The three following species, included in Pritchard's ' Infusoria ' without any 

 notification of their original authorship, are too indistinctly defined for present 

 identification. 



Epistylis barba. 



Bodies of animalcules ovate, oblong, white ; pedicle branching dichoto- 

 mously, longitudinally and regularly striate. Dimensions unrecorded. 

 Hab. — Fresh water, on the larvae of aquatic insects. 



Epistylis euchlora. 



Bodies of animalcules oblong, slightly expanded anteriorly, containing 

 green granules ; pedicle smooth, branching dichotomously. Altitude 1-13". 

 Hab. — Fresh water, on Planorbis cornea, Berlin. 



Epistylis pavonina. 



Bodies of animalcules very large, helmet-shaped, elongate anteriorly ; 

 pedicle very high, longitudinally striate, dichotomously branched. Altitude 

 of entire colony 1-3". Hab. — Fresh water, Berlin. 



The Epistylis botrytis of Ehrenberg, *' Bodies exceedingly minute, not exceeding 

 the 1-2400", clustered at the extremity of a simple hyaline pedicle," is undoubtedly 

 identical with the AntJiophysa vegetans of Fresenius, and Codosiga piilcherrimiwi of 



* 'Zeitschrift fiir Wissenschaftliche Zoologie,' Bd, xxxix., 1877. 



t " Protozoen des Nordlichen Russland," ' Archiv f. Mikroskopischer Anatomic,' Bd. xvi., 1878. 



