512 PROF. A. DENDY AND MISS L. M, FREDERICK ON 
The large size of the flagellate chambers, and the highly lacunar character 
of the canal-system generally, indicate that this sponge is a true Spongeliid 
and not a reduced Tetraxonid that has lost its proper spicules. 
Previously known Distribution. Port Phillip Heads {Carter, Lendenfeld) ; 
Port Jackson {Lendenfeld) . 
Register No. and Locality. IV. 11, Wooded Isle. 
47. HiPPOSPONGiA INTESTINALIS {Lamarck). 
(For literature and synonymy vide Dendy [1905].) 
There are two specimens in the collection, light brown in colour, of 
elongated tubular form, with their walls perforated at irregular intervals and 
the surface slightly conulose. The tubes are about 12 mm. in diameter. 
The main skeleton is composed of an irregular network of fairly stout, 
ambei'-coloured, horny fibre, the fibres measuring up to O'OSmm. in diameter. 
There is a surface reticulation of more slender horny fibre. A certain amount 
of foreign matter, including a few huge oxeote spicules, has been incorporated 
within the sponge. 
Previously knoivn Distribution. Mediterranean {Ljamarck) ; Zanzibar 
{Hyatt) ; Mascarene Islands and Arairante Group {Ridley) ; Ceylon Seas 
{Dendy) . 
Register JYos. and Locality. VI. 13 a, VII. 2, Sandy Isle. 
48. CosciNODEEMA PYEIFORME Lendenfeld var. a. 
Cosciiioderma pyriforme Lendenfeld [1889]. 
There are four specimens in the collection. The largest fP.N. III. 7), 
which must be regarded as the type of the variety, is erect, massive, somewhat 
compressed laterally, and has evidently been attached to a rock along its base 
and a portion of one side ; the total height is 50 mm., the maximum breadth 
65 mm., and the average thickness 25 mm. A number of sphinctrate oscula, 
about 3 mm. in diameter, are arranged along a crest on the upper surface. 
The second specimen (R.N. II. 7 a), which measures 45 mm. long, 35 mm. 
wide, and has an average thickness of 12 mm., is oval and somewhat cushion- 
shaped; a number of round s|>hinctrate oscula, the largest of which measures 
2 mm. in diameter, lie round the edge of the convex upper surface. The under 
surface is smooth and slightly concave, and has a few small oscula scattered 
over it. The third specimen (R.N. VI. 20 a) is erect, flabellate, with oval 
outline, attached to a rock by a short, thick stem ; it is 35 mm. high, 28 mm. 
wide, and about 6 mm. thick; there is a single osculum on one side. The 
fourth specimen (R.N. VI. 22) is a small oval fragment which has probablj' 
been torn off a larger one. 
The surface is for the most part minutely conulose, the conuli being more 
marked in some places than others, while in parts it is quite smooth; there 
