150 DR G - w - LEE 0N 



be questioned whether Caninia and Campoplujllum are in reality generically 



separable. 



The retention of the latter genus, however, seems advisable on the whole, if only for 

 convenience in working purposes. 



Campophyllum carinatum sp. nov. (PL I. figs. 3-6.) 



in 



Two complete specimens and six fragments referable to this species were found 

 the collection. 



EXTERNAL CHARACTERS. 



Corallum elongated, more or less cylindrical, and often slightly twisted. Largest 

 diameter known, 2 cm. ; but most of the specimens are much smaller. Epitheca, thin, 

 smooth, with abundant faint lines and constrictions of growth. In the young and 

 conical part of the corallum, faint longitudinal ribbing, with the pinnate arrangement 

 characteristic of Rugose corals, can sometimes be seen. Calyx unknown except in 

 vertical section. (PI. I. fig. 3.) 



INTERNAL CHARACTERS. 



(a) Transverse Sections. — Major septa of uniform thinness throughout, closely 

 set, and never reaching to the centre of the section. The base tabular area in the 

 centre of the corallum is of very variable width (compare figs, da and 4, PI. I.), 

 owing to the amplexoid nature of the septa. The minor septa are long, and 

 project a short distance past the dissepiments into the tabular zone. Both major 

 and minor septa possess well-marked carinas, appearing in transverse sections as 

 minute irregular teeth-like projections along the septa. No distinct fossula has been 

 observed. 



(b) Vertical Sections. — The tabula? are numerous, horizontal in the centre of the 

 corallum, but curving abruptly downwards before reaching the dissepiments, which are 

 small, globose, and developed at an early stage. The breadth of the tabulate zone is 

 uniform in the more mature part of the corallum, but that of the dissepimeutal zone is 

 very variable (see figs. 3 and 5, PI. I.). 



When the vertical section is cut down the centre of the corallum and passes down 

 the surface of a septum, the true nature of the carinas can be readily observed ; they 

 form closely set spiny ridges running upwards and inwards over the surface of the septa, 

 in a somewhat irregular manner (see figs. 3 and 5, PI. I.). Under a high magnifica- 

 tion, in the centre of certain of these ridges there is a line of minute black points from 

 which radiating fibres proceed. These black points are probably centres of calcification, 

 and indicate that the carinal ridges are composite, being formed by the fusion of closely 

 set spines, lineally arranged. 



Remarks. — There are many points of resemblance between this interesting species 



