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. 



'■'■ 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. 



