496 PEOF. A. DENDY AND MISS L. M. FREDEEICK ON 
in colour and apparently about 30 mm. in diameter. The surface oi' the 
former is only slightly tessellated, while that of the latter, as far as can be 
judged, is fairly smooth but uneven. The cortex of both is lacunar and not 
densely charged with spicules. 
The skeleton consists of radially arranged bundles of strongyloxea, which 
penetrate the cortex and spread out in brushes beneath the surface ; loose 
radially arranged megascleres are scattered between the bundles. 
Spicules : — (1) Strongyloxea of the usual type, measuring about 1'26 by 
0-016 mm. 
(2) Spherasters ; about 0'06 mm. in diameter, with conical, shai-p-pointed 
rays, nearly as long as the diameter of the centrum. 
(3) Small asters of cortex and choanosome ; these range from tylasters, with 
the ends of the rays beset with small spines, to oxyasters. The diameter of the 
small aster varies from O'Ol to 0'012 mm. 
This species is undoubtedly closely related to Donatio, rohusia (Bowerbank), 
but differs from it in the size of the spherasters and in small differences 
in the small asters. 
Previously known Distrihution. Port Jackson, N.S.W {Lendenfeld, Hall- 
mann) ; Port Phillip Heads (Hentscliel). 
Register Nos. and Locality. VI. 17a, VII. If, Sandy Isle. 
23. Chondrilla austkaliensis Carter. 
(For literature and synoByiny vide Dendy [1916 B].) 
There are two small specimens in the collection ; one is buff-coloured in 
spirit, the other liver-brown. The external form and spiculation agree closely 
with those of the type. 
Previously known Distribution. Port Jackson, E. Coast of Australia 
{Carter, Lendenfeld); Sharks Bay, S.W. Australia (Hentschel) ; coast of 
Cochin China (Lindgren) ; Okhamandal, Ceylon, Indian Ocean (Dendy). 
Register Nos. and Localities. VII. 4 a. Turtle Bay ; VIII. 1, Sandy Isle. 
24. Eeniera aqd^ductus 0. Schmidt. (PI. 25. fig. 12.) 
Reniera aquceductus Schmidt [1862]. 
Reniera aqucBdiictits Kolliker [1864]. 
Reniera aquceductus Czeruiavsky [1878]. 
Reniera aquceductus Swartschewsky [1905]. 
Reniera aquceductus Ostroumov [1898]. 
Reniera aquceductus Babii'i [1921, 1922]. 
The single specimen (PL 25. fig. 12), which measures 55 mm. in height, 
is erect, tubular and thin-walled ; at the upper end it divides into two short 
tubes, each of which terminates in a large round osculum 3 mm. in diameter. 
Inhalant apertures, visible with a pocket lens, are scattered over the smooth 
surface. Colour in spirit greyish brown ; texture delicate, spongy, fragile. 
