_Plumatella repens_, Jullien, Bull. Soc. zool. France, x, fig. 37 (_lapsus_ for 73), p. 110 (1885). _Plumatella diffusa_, _id._, _ibid._ figs. 155, 157, pp. 130, 131. _Plumatella allmani_ var. _diffusa_, Annandale, Rec. Ind. Mus. v, p. 49 (1910). _Zoarium._ The zoarium often covers a considerable area on flat surfaces and is sometimes found crowded together on the stems of plants. In the latter case the arrangement of the main branches is distinctly radiate. Upright branches occur rarely and never consist of more than three zooecia. The characteristic method of branching is best represented by the following diagram:-- [Illustration: Fig. 43.] The partitions are stout and numerous. _Zooecia._ The great majority of the zooecia in each zoarium are distinctly L-shaped, the long limb being usually adherent. The vital organs of the polypide are contained in the vertical limb, while the horizontal one, in mature polyparia, is packed full of free statoblasts. The zooecia are cylindrical and as a rule obscurely emarginate and furrowed. The ectocyst is stiff; it is never deeply pigmented but is usually of a transparent horn-colour at the base of each zooecium and colourless at the tip, the contrast between the two portions never being very strong. The basal portion is rough on the surface, the distal portion smooth. _Statoblasts._ Free statoblasts are produced in very great profusion and fixed statoblasts are also to be found as a rule. The latter resemble those of _P. emarginata_. The free statoblasts are never very large or relatively broad, but they vary considerably as regards size and outline. The capsule is large, the sides convex outwards and the extremity more or less broadly rounded. The air-cells are unusually large and extend over a great part of the dorsal surface of the statoblast. _Polypide._ The polypide is shorter and stouter than that of _P. emarginata_ and as a rule has fewer tentacles. The most characteristic feature of this species is the form of the zooecia, which differ greatly from those of any other Indian species but _P. allmani_. In the latter they are distinctly "keg-shaped" (_i. e._, constricted at the base and swollen in the middle), and the zoarium never spreads out over large surfaces in the way in which that of _P. diffusa_ does. TYPE--? in the Philadelphia Academy of Sciences. GEOGRAPHICAL DISTRIBUTION.--This species was originally described from North America (in which it is apparently common) and occurs also in Europe. I have seen Indian specimens from the following localities:--BENGAL, Calcutta and neighbourhood; Rajshahi (Rampur Bhulia): E. HIMALAYAS, Gangtok, Native Sikhim (alt. 6,150 feet) (_Kirkpatrick_, _Stewart_): PUNJAB, Lahore (_Stephenson_).