BY E. F. KALLMANN. 483 



Carter, together with an incomplete specimen occurring in the 

 collection of the Australian Museum: the register-numbers of 

 the former are 297, 366, 426, 470 (two spms.), 983, 984, 1000 

 (two spms.), and 1061. So far as skeletal features are concerned, 

 the specimens exhibit no marked differences (either among them- 

 selves or from the typical example), except in certain details of 

 their microspiculation; but the extra-axial skeleton is somewhat 

 less sparse than in the type-specimen, — as may be observed from 

 a comparison of the figures illustrating the appearance of the 

 entii'e skeleton, — and the colour of the skeleton (in the denser 

 portions thereof) is not brownish-grey, but varies from pale 

 straw-yellow to light golden-yellow. The megascleres are, in all 

 of them, of approximately the same forms and dimensions as in 

 the typical specimen, the greatest deviation by far occurring in 

 in the case of R.N. 426, in which the megascleres of the stalk 

 attain a maximum size of 325 by 9'5/x, while those of the branches 

 rarely exceed 290 by 7'5/x. All likewise agree with the type- 

 specimen in possessing long and relatively rather slender branches, 

 which attain their maximum stoutness at some distance above 

 their base; and, with rare exceptions, the branches taper more 

 or less distally. On the other hand, in a number of other ex- 

 ternal features, and especially in the distribution of the dermal 

 pores, considerable variability is displayed. Non-anastomosis 

 between the branches is the rule. The colour, except in one 

 instance, is some shade of pale yellowish-grey. 



Exact resemblance to the typical specimen, as regards the 

 mode of disposition of the dermal pores, is shown only by the 

 incomplete specimen which is in the collection of the Australian 

 Museum. In this specimen, the surface is somewhat ruggedly 

 uneven (PI. xxi., fig.3), the branches (with a maximum stoutness 

 of only 8mm.) are not at all flattened, and thecolour is a slightly 

 salmon-pinkish stone-grey. Microstrongyla are absent. (A 

 photograph of the macerated skeleton is shown in PI. xxiii.,fig.6). 



R.N. 1061 approaches the typical specimen in general habit 

 (PI. xxiv., fig.l), but the branches are much less tapered (occa- 

 sionally of nearly uniform diameter throughout their length), the 

 surface is faintly granular and somewhat uneven, and the oscula, 



