new Species q/' Carpenter ia. 213 



the chambers of Planorhulina retinaculata (Park. & Jones, 

 Phil. Trans. 1865, pi. xix. fig. 2) and some limacine forms of 

 Planorhulina from Australia that I possess. Like Planorhu- 

 lina^ too, the pore-tubulation is very large and distinct in all the 

 species of Garjpenteria that have come under my notice, which, 

 together with Polytrema tniniaceum, might all perhaps in their 

 earlier forms be reduced to a single planorbuline cell com- 

 mencing in an embryonal chamber (figs. 14-17), which is fol- 

 lowed by a helical development subsequently lost in the acer- 

 vuline heap of cells that are developed around it on passing 

 into its ultimate form. 



Although it is not so easy to recognize the earlier forms of 

 Carpenteria as those of Polytrema viiniaceum (from the red 

 colour of the latter) , there is the ditference in form to help us 

 (compare fig. 11 with fig. 4, Ann. & Mag. Nat. Hist. 1876, 

 vol. xvii. pi. xiii.); and thus it seems desirable to give a de- 

 scription and representation of some minute specimens (three) 

 existing, in company with Carpenteria monticularis and Poly- 

 trema atriculare^ on the specimen of Siderastroia bearing Bdel- 

 loidina aggregata. These, which, having escaped notice before 

 they were detected by the microscope, had become more or less 

 injured, are situated on a patch of Wehhina whose moniliform 

 contort strings of chambers, composed of grains of white cal- 

 careous sand &c., contrast strongly with the delicate, thin, 

 transparent, homogeneous, glass-like, foraminated film of which 

 the aggregated tests of the young Carpenterice are composed 

 (fig.ll) , the most perfect specimen of which is about l-60th inch 

 in diameter, and consists of a conical hollow pillar with circu- 

 lar aperture (fig. 11, a) rising from a great number of long 

 foraminated chambers arranged in a radiating manner around 

 its base, so as to produce a disk-like figure with jagged edges 

 caused by the unequal extension of the chambers (fig. 11, h). 

 In each of the three specimens the last-formed or upper cham- 

 bers are glassy and colourless (fig. 11, ^), while the lower or 

 previously formed ones (fig, 11, c) present a hair-brown colour, 

 arising apparently from dried brown sarcode within them. 

 Close to the patch of WeMina &c. is a specimen of Bdelloi- 

 dina aggregata ; and there are many pieces of Polytrema mini- 

 aceum and cinnamon-coloured groups of P^a^iorJu^iwa scattered 

 about the rest of the coral. 



Polytrema miniaceum^ var. album. 

 Besides Carpenteria monticularis^ the same piece of Tubi- 

 pora musica bore specimens of red, cinnamon, and white varie- 

 ties of Polytrema miniaceuni^ all branched, and so like each other 

 that, but for the colour, no essential difference could be per- 



