Mr. H. J. Carter oyi Teichonellidae, 37 



a a a), which is more or less plicate, about 6 inches ; average 

 thickness of lamina l-6th inch, 



Hab. Marine. Mode of growth (that, is whether pendent 

 or erect) unknown. 



Log. Australia, Freemantle. 



Obs. The specimen represented in figure 1 has been in the 

 British Museum for many years, as indicated by the " register 

 number," viz. " 46. 8. 19. 101 ; " and other fragments of the 

 same species, from Freemantle, in Australia, have been found 

 among the late Dr. Bowerbank's collection of sponges, which 

 has been purchased by the Trustees of the British Museum, 

 one of which, chiefly to show the vents and excretory canal- 

 systems respectively, is represented in figs. 2 and 3. It is by 

 far the largest Calcisponge on record, and its spiculation so 

 like that of Leucoma Johnstonii, Cart., = Leucandra^ Haeckel, 

 as, at first sight, to appear identical. The large quadriradiate 

 whose horizontal rays are tessellated in among the surface- 

 structure, while the fourth or vertical one projects into the 

 interior of the sponge, undoubtedly adds greatly to the 

 strength of the exterior. In its compressed vallate charac- 

 ter, proliferous growth, and marginal apertures it is identical 

 with many of the siliceous sponges, although the latter are, 

 of course, much larger. The spicules vary in size below the 

 measurements above mentioned. 



2. Teiclionella labyrmthica^ n. sp. (PL II. figs. 6-9.) 



Calcisponge. Subglobular, foliate, somewhat compressed j 

 consisting of a short, thick, round stem (fig. 6, d)^ expanded 

 into a mass of more or less vertical laminse (fig. 6, a a a), 

 which are so folded together, backwards and forwards, in and 

 out, as to make it difficult to say whether the wht)le does not 

 belong to one and the same lamina. Colour now greyish 

 white. Surface of lamina even on both sides ; margin thin, 

 round, sinuous, following the plication, here and there everted. 

 Pores invisible to the unassisted eye, confined to one side of 

 the lamina (fig. 6, b). Vents uniformly spread over the other 

 side, about l-360th inch in diameter and l-180th inch apart 

 (fig. 6, c) ; the latter on the inner, and the former on the 

 outer side respectively, where the lamina is folded upon itself 

 and in contact (fig. 8). Internal structure minutely areolar, 

 columnar (fig. 8, ddd), vertical to the sides of the lamina, 

 which varies from l-16th to l-12th inch in thickness, thin- 

 ning towards the margin. Columnar structure formed by 

 aggregation of the straight arms of the triradiate spicules 

 (fig. 10, a) into cylinders (fig. 9, c), which, traversing the 

 areolar sarcode, pass directly from the pores on one (fig. 9, a) 



