On the Locality o/" Carpenteria balaniformls. 209 EXPLANATION OF PLATE Xni. (figs. 1-8). Fig. 1. Bdelloidina af/gregata, n. gen. et sp., on a portion of Siderastrfea, magnified four diameters, a, convex margin of the last chamber, along whinh are arranged the " pseudopodial apertures " (see fig. 5, a) ; b, lines marking the septal limits of the chambers respectively. Diagram. Fig. 2. The same : square indicating natural size. Fig. 3. The same : portion of surface, magnified to show arenaceous composition of the test. Scale l-48th inch to l-1800th inch. Fig. 4. The same ; horizontal section of two chambers (upper half), to show : — a, septum between the two chambers ; b b, holes of intercameral communication in the septa ; c c, roof of chambers respectively, and internal pore-canal openings analogous to those in the shell of Nummulites. Same scale. Diagram. Fig. 5. The same ; vertical section of a chamber longitudinally, to show: — a, holes of intercameral communication through the septum ; b, pore-tubulation (" labyrinthic structure") of the roof or upper wall of the chamber ; c, basal wall or floor. Same scale. Diagram. Fig. 6. The same : transverse section of the chamber vertically, show-ing : — a, cavity ; b, walls ; c, pore-tubulation or " labyrinthic structure." Same scale. Diagram. Fig. 7. The same : portion of fig. 5 more magnified, to show : — a, septum ; b, hole of intercameral communication ; c, basal wall or floor ; d, roof of chamber; e, pore-tubulation or "labyrinthic struc-ture" amidst the sand-grains of the upper wall or roof;/", dark line indicative of the sarcodic layer. Diagram. Fig. 8. The same : portion of fig. 4, c c, more magnified, to show that the pore-canal openings are deeply sunk in the interstices of reticulated rugse pendent from the roof, a, rugse ; b, pore-canal openings. XVI. — On the Locality of Carpenteria balaniformisj with Lescri-ption of a new Species and other Foraminifera found in and about Tubipora musica. By H. J. Carter, F.R.S. &c. [Plate XIII. figs. 9-15.] In my paper on the Polytremata (Ann. & Mag. Nat. Hist. 1876, vol. xvii. p. 199) the following statement is made re-specting the habitat and locality of PoJytrema balaniforme = Carpenteria halaniformis^ viz. : — ^^Hab. Marine, on the valves of Mytilicardia calyculata and other objects, viz. Pecten^ Porites^ &c. 'â– 'â– Loc. West Indies? Indian Ocean." "West Indies " was conjectural ; and although I have eveiy reason for concluding that the Mytilicardia on which my spe-cimen of P. balaniforme had grown had come off a sponge, it was equally conjectural where that sponge had come from ori-ginally.
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