1118 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



32. SPECIES, LEUCETTA DURA. Von Leudenfeld. 

 LEUCONIA DURA. Pol^jaefif (1). 



Irregular colonial or solitary Sponges with or without a frill 

 round the Osculum. Grastral cavity small. Besides the regular 

 spicules of large and small size there are irregular and sagittal 

 Triradiates. The latter are amassed around the Oscula. 



Locality : Bermudas, North Coast of Australia, Torres Straits 

 Challenger. 



33. SPECIES. LEUCETTA PANDORA. Haeckel (2.) 



A solitary Sponge, without frill round the osculum. Spherical 

 or ovate often with a short peduncle. They are 12 to 15 mm. 

 long and have a diameter of 8 to 12mm. The Q-astral wall is 

 very thin, measuring only l-lo mm. in thickness. Dermal and 

 Gastral surface smooth. Triradiates very variable in size and 

 shape, in greater part or throughout irregular, with bent unequal 

 rays. Earely acerate, and quadriradiate spicules are met with, 

 so that E. Haeckel establishes three connective varieties of this 

 species : Leucaltis pandora, Leucortis pandora, Leucandra 

 pandora. The spicules contain, according to Haeckel (3) more 

 organic substance in proportion than those of other Leucetta 

 species. The mean size of the rays is 0'3 — 0*6 x 0-0005 — 0005. 



Locality: South Coast of Australia, Bass' Straits, Wendt ; 

 St. Vincent's Gulf, Schomburgh. 



34. SPECIES. LEUCETTA CLATHRATA. Carter (4.) 



A cake-like Sponge, consisting of a plate-like basal extension, 

 which bears curved cylindrical extensions on the upper surface, 

 the latter appearing on relief. Triradiates of two kinds, small 

 ordinary regular ones in great abundance with rays measuring 



(L) N. Polejaeff. Report on the Calcarea. The Zoology of the Voyage 

 of H.M.S. Challenger. Part XXIV., p. 65, pi. XL, fig. 3; pi. VIL, figs. 

 7a-7aiii. 



(2.) E. Haeckel Die Kalkschwamme. Eine Monographic. Band II., 

 Seite 127., Bd. III., Taf. XXII., figs. 3a-3o. 



(3.) E. Haeckel. L.c. Band II., Seite 129. 



(4.) //. T. Carter. Annals and Magazin of Natural History 23 ; 

 series. Vol. XL, nr. 61, p. 33, pi. I., figs. 13-17. 



