1120 A MONOGRAPH OP THE AUSTRALIAN SPONGES, 



Spicules ; A dense felt-like layer of Triradiates and Quadri- 

 radiates with one very short ray clothing the Gastral cavity. The 

 rays of these spicules measure on an average 0-1 x 0-01 mm. 

 Rare regular triradiates in the Parenchyma with straight conic 

 rays measuring 0-28 x 0*03 mm. Very numerous sagittal 

 quadriradiates, the sagittal ray mostly pointing towards the 

 interior of the Parenchyma. Sagittal ray straight, conic and 

 pointed 0-42 x 0-056. The three basal rays alike with equal 

 angles between them, straight, conic and pointed 0-35 x - 042 mm. 

 Dermal quadriradiates sagittal. Differentiated ray centripetal, 

 straight, conic and pointed 0-57 x - 05 — 0*06, always exactly 

 radial. Tangental rays curved in the proximal, and straight in 

 the distal part ; conic and pointed, all equal and regularly 

 disposed convex towards the outer side - 28 x 033 — 0-04. 



Locality : East Coast of Australia, Port Jackson. Von Len- 

 denfeld. 



36. SPECIES. LEUCALTIS PUMILA. Hackel (1.) 

 LEUCONIA PUMILA. Bowerbank (2.) 

 LEUCONIA PUMILA. Gray (3.) 

 DYSSYCONELLA PUMILA. Haeckel (4.) 



This Sponge does not appear to form colonies. It is always 

 solitary spindle-shaped, ovate or cylindrical, with or without 

 Osculum, which may be sessile or on the termination of a long 

 proboscis. Sponge 10 to 20 mm. long and 3-7 mm. in diameter. 

 Gastral cavity cylindrical. Body wall of uniform thickness 

 1 to 2 mm. The regularly disposed Gastral pores have a 

 diameter of 0*3 — 0*6 mm. The exhalent canals form alacunose 

 reticulation composed of relative narrow tubes. All the Australian 

 specimens examined by Haeckel, possess a proboscis. 



(1.) E. Haeckel. L.c. Band II., Seite 148., Band III., Taf. XXVII. , 

 figs. 2a-2g. 



(2.) T. S. Bowerbank. Monograph of the British Spongiadse. Vol. II., 

 p. 41. 



(3.) F. Gray. Proceedings of the Zoological Society of London, 1S67, 

 p. 556. 



(4.) E. Haeckel. Prodromns eines Systems der Kalkschwlimme. 

 Jenaische Zeitschrift fur Medicin mid Wissenschaft. Band V., Heft II., 

 Seite 242. 



