BY R. VON LENDENFELD, PH.D. 1097 



and pointed, the outer ends thick and rounded. Tubar triradiate 

 spicules with right angles, the proximal and distal spicules more or 

 less differentiated. Gastral quadriradiates mostly regular or sub- 

 regular, with straight and thin facial rays. Their apical ray very 

 strong, cylindrical or spindle-shaped, straight or slightly curved, 

 thicker and longer (twice as large) as the rays of the proximal 

 triradiate spicules. 



Coloior : Dry, and in spirit, white or yellowish. 



Locolity : Indian Ocean, Quoy et Gaimard ; Java, Mulder ; 

 West Coast of Australia, Harvey ; Fremantle, G. Clifton ; Mouth 

 of the Murray Kiver, Eay. 



17. SPECIES. SYCANDRA RAMSAYI. Nov. spec. 



Sac-shaped or spherical Sycandrae which never form colonies, 

 obtaining a height of 50, and a diameter of 40 mm. The body 

 wall is very thick, so that even the largest specimens have a com- 

 paratively small Gastral cavity which is more or less tubular, sac- 

 shaped. In consequence of the thickness of the body wall, the 

 ciliated tubes attain an exceptional length ; they are longest in the 

 middle of the Sponge. Their length decreases towards the oral 

 and aboral end. The Sponge attains in consequence of the long 

 protruding dermal acerates, a very hairy appearance. The circular 

 Osculura 5 to 10 mm., in diameter, is surrounded by a frill of very 

 long (4 mm.) longitudinal Acerates. The protruding nearly conic 

 distal end of the ciliated tubes are crowned by clusters of very long 

 and slender acerates. 



Spicules : Gastral radiate spicules very slender, irregular. 

 Centripetal radial ray conic or cylindrical neai'ly straight, 

 0-22 X 0-005 ; transverse tangental rays straight, 0*2 x 0-0048 

 longitudinal tangental ray O'l x 0-003 — 0004 pointing towards 

 the aboral pole. The centi'ipetal radial rays protrude into the 

 Gastral cavity. 



Parenchymal Spicules ■' Triradiates and quadriradiates with 

 numerous transition forms. The largest quadriradiates perfectly 

 regular, all rays straight slender and slightly conic. 0-17 x 0-0048. 

 The rays of the largest triradiates which are likewise regulai", of 



