534 ORDER HOLOTRICHA. 



ventral surface near the anterior extremity, its outer margin bordered by a 

 spiral circle of cilia of larger size than those which cover the general surface 

 of the body; the upper portion of the posterior extremity of the oral 

 fossa bearing an undulating membrane. A coloured eye-like pigment-spot 

 often present near the anterior extremity ; the cortical layer frequently 

 containing trichocysts. 



The conspicuous fringe of larger adoral cilia serves to distinguish the representa- 

 tives of this genus from those of Opiiryoglcna, with which they otherwise closely 

 correspond ; the spiral disposition of these adoral cilia separates it in a distinct 

 manner from the succeeding genus Cyclotricha. 



Panophrys flavicans, Ehr. sp. Pl. XXVI. Figs. 65 axd 66. 



Body elongate-ovoid, convex above, flattened beneath, rounded 

 anteriorly, pointed at the posterior extremity, about twice as long as broad ; 

 colour yellow; entrance to oral fossa subterminal, crescentic, associated 

 with a spirally winding adoral fringe of larger cilia, its cavity capacious, 

 extending back to within a short distance of the median line ; an 

 anterior red eye-like pigment-spot usually present; the cortical layer en- 

 closing numerous evenly developed trichocysts ; endoplast oval. Length 

 1-144". Hab. — Bog water. 



This species, which constitutes the type-form of the genus Panophrys of Dujardin 

 and Stein, is identical with the Ophryoglena fiavkaiis of Ehrenberg. 



Panophrys flava, Ehr. sp. 



Body normally pear-shaped, flattened, narrowest posteriorly, little over 

 twice as long as broad, flexible and somewhat changeable in form ; colour 

 yellow ; adoral cilia spirally arranged ; no eye-like pigment-spot nor tricho- 

 cysts. Length 1-96". Hab. — Fresh water. 



^\■hile most nearly resembling Panophrys flavicans, Claparfede and Lachmann 

 remarks that it is readily distinguished from that species by its non-persistent shape, 

 and by the absence of a pigment-spot and trichocysts. It was first described by 

 Ehrenberg under the title of Bursaria flava, but subsequently transferred to the 

 present genus by Dujardin. 



Panophrys chrysalis, Duj. 



Body ovoid or oblong, depressed, rounded at the two extremities, twice 

 as long as broad, margin of oral fossa projecting ; cortical layer apparently 

 armed with trichocysts. Length of body 1-138". Hab. — Saltwater. 



Supplementary Species. 



The species described by Ehrenberg under the two tides of Bursaria leucas and 

 Bursaria vernalis, referred to the genus Panophrys by Dujardin, has been selected by 

 Stein as the tj'pe of the new genus Cyrtostomum, previously described. Other forms, 

 included in the genus Panophrys by Dujardin and Perty under the titles of P. rubra, 

 farcta, conspicua, sordida, zonalis, griseola, and paramecioides, are characterized too 

 insufficiently for present identification. 



