new Species o/'Carpenterlo. 213 



the chambers of PlnnorhuUna retinnculutti (Park. & .June.-i, 

 l*hil. Trans. 18()5, \)\. xix. i\<^. 2) and some liniacinc turm.s of 

 Planorbulina from .Vu.stralia that 1 possess. Like Planorhu- 

 Una^ too, the pore-tuhnhition is very hirf^e and distinct in all the 

 species of Carpenteria that have come under mj notice, which, 

 t<^^ether with Poh/trema miniacemn, mi,c^ht all ])erhaps in their 

 earlier forms be reduced to a sinule plauorbuline fell com- 

 menciui:^ in an embryonal chamber (ti^s. 14-17), which is fol- 

 lowed by a helical development subsequently lost in the accr- 

 vuline heap of cells that arc developed around it on passing 

 into its ultimate form. 



Althoui^ii it is not so easy to recognize the earlier forms of 

 Carpenteria as those of Poh/trema miniaceum (from the red 

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

 (compare fig. 11 with fig. 4, Ann. it Mag. Nat. Hist. 187G, 

 yol. 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 Pol i/- 

 trema atriculare, on the S]}ecimen of Siderastra;a hearings BJel- 

 loiiJina afj(jref/ata. 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, ihin, 

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

 the aggregated tests of tlie young Carpenter i(p are composed 

 ^fig.Tl), the most ])erfect specimen of which is about l-(]()th 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 luiequal extension of the chambers (fig. 11, l). 

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

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

 prcviou.sly formed ones (fig. 11, c) present a hair-brown colour, 

 arising apj)arently from dried brown sarcode within them. 

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

 dina arjijrecjata ; and there are many pieces of Poh/trema mini- 

 aceum and cinnamon-coloured gi'oups of P^auo/'&M/i'/ta. scattered 

 about the rest of the coral. 



Polytrema miniaceum^ var. album. 

 Besides Carpenteria monticularis j the same piece of Tubi- 

 pora musica bore s])ccimcns of red, cinnamon, and white varie- 

 ties oi Polytrema miniaceum, all branched, and so like each other 

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



