442 Mr. H. J. Carter on Specimens 



before mentioned, some of which may be seen in the large 

 apertures as well as cavities respectively of the terminal cells 

 themselves (fig. 1,^). Internal structure consisting of cells 

 or chambers of different sizes, the largest and most regularly 

 formed of which are arranged cortically (fig. 1, a), where 

 their outer wall, corresponding to the " gentle convexities " 

 on the surface, is pierced by the pore-tubules (fig. l,f,gg) 7 

 whose sunken apertures there are the holes also before men- 

 tioned (fig. 1, e) ; opening internally into a cancellated axial 

 structure (fig. 1, a), whose cavities, communicating freely with 

 each other, finally terminate in the rima between the groups 

 of free cells at the ends of the branches respectively. Cells 

 generally more or less filled with fragmentary sponge-spicules, 

 especially the free ones at the ends of the branches (fig. 1, b). 

 Size of specimens (which are very constant in this as well as 

 in their form) about 1-ord inch long and l-12th inch thick ; 

 branches l-16th inch long and a little less in diameter than 

 the pillar. 



Hob. Marine, growing on hard objects. 



Loc. Gulf of Manaar. 



Obs. This is undoubtedly a species of Polytrema, as evi- 

 denced by its structure, colour, and the presence of fragmen- 

 tary sponge-spicules at the ends of the branches, in the 

 interior of the cells, and on their way to them respectively 

 through the apertures mentioned. Its size and form appear 

 to be very constant, as above stated, although in one instance 

 there was a tendency to divide in one of the groups of cells 

 at the ends of the branches. What the object of taking in 

 alone so many " fragmentary sponge-spicules " can be with 

 these Foraminifera, when there are so few comparatively in- 

 corporated with the substance of the test, I am unable to 

 conceive, especially as the very fact of their being " fragmen- 

 tary " shows that they must have been drifting objects unac- 

 companied by any sponge-sarcode for nourishment, since 

 " fragmentary spicules " do not, as a rule, exist in a living- 

 sponge. 



Tubipora repto.ns, n. sp. (PI. XVIII. fig. 2, a-Tc.) 



Corallum strong, stoloniferous, vermiculate or crooked, not 

 branched, flat, following the form of the surface on which it 

 may be growing, bearing short, erect, cylindrical calycles 

 situated at unequal distances from each other. Colour crimson, 

 translucent (PI. XVIII. fig. 2) . Surface uniformly rough and 

 foraminated, from the holes being sunk in the substance of the 

 coral and the intervals in relief (fig. 2, k). Calycle sur- 



