BY R. VON LENDENFELD, PH.D. 1089 



Medial triradiates regular, rays conic O048 x 0*003. Dermal 

 rays similar in size and shape to the former on the summits of the 

 radial tubes some triradiates are situated, the outer rays of which 

 protrude beyond the surface. Dermal acerates protruding and 

 leaning towards the Osculum under an angle of 45° - 71 x 0*0071 

 mm., cylindrical, pointed, the centrifugal end abruptly pointed to 

 a sharp point. Situated in groups of 10 to 12 on the summits of 

 the radial tubes. Oscular acerates a longitudinal cylinder forming 

 a kind of Oesophagus with a frill of horizontal acerates. The 

 former slightly cui-ved, convex on the inner side 0.57 x - 0016, 

 the latter - 21 x 0-003 slightly concave to the front. 



Persons attaining a height of 14 mm., and a breadth of 5 mm. 



Homoderma Sycandra is connected with the Asconidse by forms 

 such as Ascaltis cauariensis (1), and Ascaltis Gegenbauri (2.) 



Localitj : East Coast of Australia, Port Jackson, South Coast of 

 Australia, Port Phillip, Von Lendenfeld. 



3. FAMILY. LEUCOPSID^E. Yon Lendenfeld. 



Homocoela with a highly developed Mesoderm in which the 

 mouthless ascon persons are imbedded. With a large Pseudogaster 

 and Pseudostom. 



Transition-form between Asconidae and Leuconidee. 



5. GENUS. LETJCOPSIS. Yon Lendenfeld. 



Leucopsidse without any canal system. The inhalent Pores of 

 the Ascon tube reticulation small and in direct communication 

 with outer water. The exhalent Pores large and opening direct 

 into the Pseudogaster. 



10. SPECIES. LEUCOPSIS PEDUNCULATA, nov. sp. 

 A pedunculate small Sponge with one or several Oscula. The 

 peduncle is hollow and clothed with ectodermal pavement cells 

 internally. On the summit of it a spherical Sponge is situated 



(1.) E. HaecM. L.c. Seite 5'2., Taf. IX., figs. 1-3; Taf. X., figs, la-lc. 

 (2.) E. Haeckel. L.c. Seite 62, Taf IX , figs. 6-8 ; Taf. X., figs. 5a-5d. 



