1088 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



S. SPECIES. ASCANDRA DENSA. Haeckel{l). 



Tri- and rare quadriradiate spicules regular, of equal size. Rays 

 straight cylindrical and pointed. Apical ray half as thick, straight. 

 A cerate spicules straight truncate on both ends, inflated on the 

 external end, 3-4 times as long, and 5-6 times as thick as the ray 

 of the triradiates. Triradiates 0-1— 042 x 0-006— 0-001 mm. 

 Acerates 0-5 — 0-6 x 0-03 — 0-04 ram., with or without Pseudo- 

 oscula. 



Locality : South Coast of Australia, Haeckel. 



2. FAMILY. HOMODERMID^. Von Lendenfeld(2.) 



Homocoela with radial tubes. 



Transition form between Asconidse and Syconid?e. 



4. GENUS. HOMODERMA, Von Lendenfeld (3.) 

 Homodermidoe which form colonies of several spindle-shaped 

 persons ; the Gastral cavities of which are connected with each 

 other by a hollow Spongorhiza. 



9. SPECIES. HOMODERMA SYCANDRA. Von Lendenfeld (4.) 

 Quadriradiate, triradiate and acerate spicules. The radial tubes 

 in regular strobiloid circles around the cylindrical Gastral cavity 

 which is clothed up to the margin of the Osculum with frilled 

 flagellate cells. Gastral quadriradiates, centripetal radial ray 

 0-02 — 0-04 X 0-0024 conic, pointed and straight ; lateral tangental 

 ray slightly curved, convex outside 0-05 x 0.0038 ; longitudinal, 

 aboral tangental ray 0-04 x 0-0038. Parenchymal triradiates ; 

 internal triradiates with unequal rays, radial centrifugal ray 

 0-048 X 0-0032 conic, sometimes protruding into the Gastral 

 cavity. Tangental basal rays curved 0-0074—0-011 x 0-0048, 

 convex towards the outer side often equatorially situated. 



(1.) E. Haeckel. L.c, Band XL, Seite 85, Taf. XIV., figs. 2a-2c ; 

 Taf. XVII., fig. 9-12. 



(2.) Von Lendenfeld. Proceedmgs of the Lmnean Society of N.S.W., 

 Vol. IX., p. 338. 



(3.) Von Lendenfeld. L.c. 



(4.) Von Lendenfeld. L.c. 



