108 Mr. H. J. Carter’s Contributions to our 
west coast of Australia, as a specimen among the late Dr. 
Bowerbank’s sponges indicates. In size this specimen does 
not exceed 2 inches in diameter; thus, although sufficient for 
identification, it adds very little to my description of A. fusca in 
the first Report of the Manaar specimens (loc. cit. p. 36). 
The dried sarcode, too, presents the appearance of dry thick 
glue, and contaims no purple pigmental cells, although an 
equal number of such cells without pigment (that is, nearly 
colourless) are especially congregated towards the surface, to- 
gether with large cylindrical fibre (fig. 11), whose branches, 
intertympanized by the sarcode, give rise to a cavernous inter- 
nal structure much coarser and larger than that of the Manaar 
specimen. On account of the large size of the fibre, averaging 
in its greatest thickness 1-24th inch in diameter, wherein the 
horny lamine (fig. 11, 6) are comparatively loosely united to 
each other and the granular axis very large (fig. 11, a), it 
affords a convenient object for microscopical dissection and 
examination of these elements, of which the former (that is, 
the horny lamine), when viewed edgewise in a transverse 
section, appear to be composed of cells (especially the outer 
ones), like those of Janthella (fig. 14), but of course without 
colour, and therefore very faintly foreshadowed. ‘To this 
fact I shall have to allude again in the next article. 
Aplysina inflata, n. sp. 
Cylindrical, somewhat curved, hollow, closed at each end, 
rendered more or less irregular by the presence of mammiform 
bud-like projections here and there. Colour dark brown 
tinged with purple, becoming greenish black-grey after much 
exposure. Surface ciliated or fringed by the projection of 
the filamentous ends of the fibre beyond the reticulation of 
the interior. Vents large, scattered here and there over the 
surface, and terminating singly at the summit of each of the 
mammiform projections. Poresnot seen. Internally hollow, 
bladder-like ; wall very thin, composed of a single layer of 
reticulated fibre, whose interstices are tympanized by the 
sarcode, which, in the dried state, are translucent. Fibre 
round, aplysinoid (that is, more or less flaccid from the large 
size of the granular core or tube compared with the thickness 
of the kerasine wall) ; kerasine fibrillous in structure longitu- 
dinally, especially after much exposure and, perhaps, drying 
in the sun. Size 43 inches long by 13 inch in diameter, 
Hab. Marine. Attached to a bivalve shell. 
Loc. Coast of S.W. Australia, Freemantle. . 
Obs. The chief character of this species is its inflated 
bladder-like structure and consequently thin wall, together 
