286 
Mr. H. J. Carter’s Contributions 
convex, and plicate longitudinally. Colour white. Texture 
cork-like. Surface extremely irregular and pitted, which pits, 
in many parts, would be open fenestrations but for being tym- 
panized with sarcode; thickly aculeated throughout (PL XXVI. 
fig. 1). Internal structure cellular or cavernous, influenced 
in the form of its cavities by the presence of a reticulated, 
anastomosing framework composed of a condensed sarcode 
(? chondroid when fresh) charged with skeleton-spicules, which 
extends into and forms the axial part of the spines respec¬ 
tively. Spicules of two kinds, viz.:—1, skeleton-, acuate, 
smooth, sharp-pointed, l-66th by 1 -3000th inch in its greatest 
diameter (tig. 2) ; and 2, flesh-spicule, stelliform, crucially 
sexradiate, with the rays short and expanded at their point 
of union in the centre ; globular and microspined at their free 
ends; size about 1-1714th inch in diameter (fig. 3). Skeleton- 
spicules chiefly confined to the framework and the flesh- 
spicules to the surface-layer on each side. Size of entire 
specimen 4f inches high, 4£ inches wide, and papyraceous in 
thinness, except where thickened by the presence of the fibre 
composing the “ framework.” 
Hab. Marine. 
Loc. ? Australia. 
Obs. Examined in the dried state. This specimen is in 
the British Museum, and, from possessing no number, must 
have been there for many years before the present u Register ” 
was commenced. It bears the letter “c," and now has 
attached to it in addition my running-number, viz. 212, E, h y 
20. The specimen is complete so far as the base or point of 
attachment and the circumference are concerned; while from 
the generally aculeated surface, form, texture, and spiculation, 
it may be seen to be chiefly allied to Axos Cliftoni ; but the 
colour now is white or brownish, as it is in dried specimens of 
Axos Cliftoni , although in the fresh state it might have been 
“ light red ” like the latter as stated by Mr. Clifton. 
Axos spinipoculum, n. sp. (PI. XXV. figs. 1-9.) 
Globo-cylindrical, oblong, massive, robust, thick, cup¬ 
shaped, excavated, sessile (PL XXV. fig. 1). Colour dark grey 
externally, whitish yellow within. Texture subcartilaginous 
and spongy respectively. Surface extremely irregular, deeply 
pitted here and there; thickly aculeated over the outside, less 
so over the surface of the excavation, which is deep, conical, 
and compressed. Aculeations short, thick, and stout, irregu¬ 
larly distributed, sometimes sharp-pointed, at others obtuse. 
Vents opening over the lower third of the outside, through 
simple holes in cribriform patches, chiefly in deep depressions 
