1120 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



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

 radiates with one very short ray clothing the Grastral 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 0*042 mm. 

 Dermal quadriradiates sagittal. Differentiated ray centripetal, 

 straight, conic and pointed 0-57 x 0-05 — 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 0'28 x 033 — 0"04. 



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

 d enfold. 



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. XXVIL, 

 figs. 2a-2g. 



(2.) T. S. Boioerhanh Monograph of the British Spongiadte. Vol.11., 

 p. 4L 



(3.) F, Gray. Proceedings of the Zoological Society of London, 1867, 

 p. 556. 



(4.) E. Haeckel. Prodromns eines Systems der Kalksch-\^amme. 

 Jenaische Zeitschrift fiir Medicin imd Wissenschaft, Band V., Heft II., 

 Seite 242. 



