PLATE X. Ep'stylis vittata sp. nov., fig. 1 . Bodies elongate-ovate, less than three times as long as broad, widest centrally, tapering posteriorly, slightly constricted beneath the peristome ; cuticular surface finely striated transversely, the posterior one-fifth also longitudinally striate ; peristome bordrr broad, not everted, not revolute, but when expanded slipping backward and invaginating the anterior border of the body as by a broad, somewhat concave band, both margins of which are

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... lly crenulate ; ciliary disc convex, prominent ; ciliary circles four ; nucleus long, band-like, much curved, often irregularly constricted ; pedicle profusely and dichotomously branched, becoming brown with age ; ultimate divisions of the foot-stalk about as long as the extended body ; zooids many, often one hundred or more in number; contracted bodies obovate, posteriorly anIiulate in several transverse folds, anteriorly plicate, the contracted ciliary disc frequently conical or snout-like ; endoplasm granular, often brownish. Length of bodies 1/12@ in. ; fully developed colony 1/5 in. in height, conspicuously visible to the naked eye. Epistylis elongata, sp. nov., fig. 2. Bodies elongate, less than four times as long as broad, widest centrally, tapering thence posteriorly, the sides of the anterior region ncnrly parallel or slight17 tapering ; cuticular surface very finely Hab. Fresh water, attached to the shell of Physa. EXPLANATION OF PLATE X. F,g. l.-Epst~/lis L.ittatu. " 2.-" elongnto. " 3.-" ntstrcmiatilis. " 4.-,. vainosa. " :i.-I'yxi(Ii~im iiiitcins. 1889. Fig. 6.-T$rticella conosoma. " 7.-,. Conoclirli. " 8.-Opisthostyln globidoris " 3 -" siinilis. L