BY R. VON LENDENFELD, PH.D. 1085 



rays which are 6 to 8 times as long as thick. The Gastral ones 

 more slender with rays which are 16 to 20 times as long as thick. 

 Triradiate spicules of the wall of the Pseudostoma with equal 

 angles and paired rays. 



Dormal rays, 0" 18—0-3 x 0-01— 0O35. 



Gastral rays, 0-12—0-18 x 0-006—0-01. 



Always Auloplegma-form. 



Locality : East Coast of Australia (Twofold Bay, Challenger), 

 and other places on the Australian Coast. Haeckel. 



3. SPECIES. ASCETTA LOCULOSA. Von Lendenfeld. 

 ASCETTA PRIMORDIALIS var. LOCULOSA. E. Haeckel (1.) 



Triradiate spicules regular, rays conic or semi-spindleshaped, 

 pointed. 



Spicules in several layers. All of the same size, the rays 8 to 16 

 times as long as thick. From the Gastral wall Lamellae extend 

 inward which divide the Gastral cavity into numerous compart- 

 ments. Haeckel (2.) states that these folds are covered by several 

 layers of entodermal Epithelium. 



Polejaeff (3 ) doubts the correctness of this statement, and also 

 I can state that I have never met with such a structure in any 

 calcarious sponge. 



Locality : Australia. Haeckel. 



4. SPECIES. ASCETTA CHALLENGER!. Von Lendenfeld. 



LEUCOSOLENIA CHALLENGER!. N. Polejaeff. (4.) 



The triradiate spicules form two layers ; a Gastral one of 

 regular spicules and a dermal one of irregular sagittal difterenciated 

 triradiate spicules. 



(1.) E. Haeckel. Die Kalkschwamme. Eine Monographie. Band II., 

 Seite 17, 23. 



(2 ) E. Haeckel. L.c, Band I., Seite 144. Band II., Seite 17, 23. 



(3.) N. Pol&jaefj'. B,eport on the Calcarea. The Zoology of the Voyage 

 of H.M.S. Challenger. Part XXIV., page 6. 



(4.) N. PoUjaeff: L.c, p. 38 ; Taf. I., fig. 1 ; Taf. III., fig. 4, 



