On the Locality o/Carpenteria balanifnniiis. 209 



EXPLANATION' OF IM-ATK XIII. (figs. 1-8). 



Fi(j. 1. BdeUo'ulina ii(/i/r<(/itf(i, n. gen. et sp., on a portion of Siderastrfra, 

 majrniliftl lour iliftiuetora. a, convex insirfrin oftlio Inst chamhor, 

 along whicli nre an-angctl tlie " pseudonodial apertures" (see 

 fig. o, a) ; b, lines marking the septal limits of the cliambers 

 respectively. I )iagrniu. 



Fi'j. 2. The .same : s(juare indicating natural size. 



Fig. 'i. The same : portion ot" surface, magnified to show arenaceous 

 composition of the test. Scale l-4Hlh inch to 1-lHOOth inch. 



Fig. i. The same: horizontal section of two chambers (upper half), 

 to show : — a, septum bel\V(!en the two chambers ; h 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. 



jFi'^. 5. The same : vertical section of a chamber longitudin illy, to show : 

 — o, holes of intercameral communication throuij-h the septum ; 

 b, pore-tubulation (" labyrinthic structure") of the roof or upper 

 wall of the chamber ; c, basal wall m- floor. Same scale. Diagram. 



Fig. 6. The same : transverse section of the chamber vertically, show- 

 ing: — a, cavit}' ; b, walls: c, pore-tubulation or "labyrinthic 

 structure." Same scale. Diagiam. 



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; c, pore-tubulalion or "labyrinthic struc- 

 ture'' amid<t 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 ])ore-canal openings are deeply sunk in the interstices of 

 reticidated rugae pendent from the roof, a, rugaj ; b, pore-canal 

 openings. 



XVT. — On the Localitij of Carpenteria balaniforiiii.s, vith 

 Deso'iptioji of a new Sjjecies and other Foramim'fera found 

 in and about Tubipora niusica. By H. J. CAirrER, F.R.S. 

 &c. 



[Plate XIII. figs. 9-lo.] 



Ix my paper on the Polytremata (Ann. & Mag. Xat. Hist. 

 1876, vol. xvii. p, 199) the following statement is made re- 

 specting the habitat and locality ot" Poh/trcma halaniforme = 

 Carpenteria halaniforniis, viz. : — 



^^ Hah. ^Marine, on the valves of ^f^/tih'cardia calyculata and 

 other objects, viz. Pecten, Porites, &c. 



" Loc. West Indies? Indian Ocean." 



"West Indies " was conjcctnral ; and althongh I have every 

 reason for concluding that the Mi/tHicardia on which my spe- 

 cimen of/*, halaniforme had grown had come off a sponge, it 

 was equally conjectural where that sponge had come from ori- 

 ginally. 



