322 Mr. H. J. Carter’s Contributions to our 
another instance of the characteristic features of the Axinellida, 
in the condensed structure of the axis growing outwards into 
spatuliform or clavate processes (equivalent to the scopiform 
ones of Phakellia ventilabrum), and the acute spicule, curved 
chiefly towards the large end, the echination being somewhat 
concealed, as above stated, by an extension of the outer lamina 
of the transparent horny fibre over their points, which thus 
encloses them. It is in the British Museum, No. 483, regis- 
tered 45. 12. 30. 1, and has very much the appearance, under 
a different form, of “ Spongia Marquezti,’ De Fonbressin 
et Michelotti (Spong. de la Mer Caraibe, p. 40, pl. xx. fig. 1, 
Harlem, 1864), which, together with the diagram of its spicu- 
lation, given in pl. i$ 4“ A,” seems to confirm this view, 
although de F. et M.’s descriptions in other respects defy all 
attempts at further identification. 
Ptilocaulis rigidus, n. sp. 
(Pl. XIII. fig. 7, and Pl. XIV. fig. 14.) 
Stipitate, composed of long, rough, cylindrical branches 
dichotomously divided, rising from a short hard stem; 
branches narrow, round, about an inch in transverse diameter, 
obtusely ended (Pl. XIII. fig. 7,a,b2). Colour now, in its 
dried state, brown. Axis consisting of condensed fibre 
charged with the spicules of the species, from which emanate 
in equally condensed structure thick short processes that give it 
its rough appearance, viz. spatuliform and expanded, bifid or 
irregularly divided towards the circumference, more or less 
regular in form generally, lobate, sometimes interuniting 
clathrously and situated at variable distances from each other ; 
pubescent generally, from the well-marked projection of echi- 
nating spicules, that is the echinonematous character (fig.7, 50). 
Spicule of one form only, viz. acerate, smooth, curved or 
rather bent on one side of the centre, sharp-pointed especially 
at one end, which is more attenuated than the other, therefore 
partaking of the form of an acuate or subacuate form ; 33 b 
13-1800ths inch in its greatest dimensions (Pl. XIV. fig. 14). 
Size of specimen 2 feet long by 11 x2 inches in its greatest - 
horizontal dimensions, presenting a compressed cluster of long 
cylindrical branches. 
Hab. Marine. 
Loc. ? Australia. 
Obs. ‘This specimen is very much like the last in general 
appearance, but probably came from the coast of South Aus- 
tralia, judging from its more robust form and greater rigidity. 
Like the other specimens from Australia before described, 
viz. Phycopsis, it has but one form of spicule, and that acerate; 
