1136 A MONOGRAPH OP THE AUSTRALIAN SPONGES, 



The former are sagittal. They are similar to the Gastral 

 Triradiates described above. The sagittal ray a little longer, the 

 lateral rays curved. Acerates longitudinal packed closely. They 

 measure 0-1—3 x-006— 0-012 mm. 



Locality : Indian Ocean, Polk Straits, Ceylon, Wright ; South 

 Coast of Australia, St. Vincent Gulf, Schomburgk ; Bass Straits, 

 Wendt. 



48. SPECIES. LEUCANDRA BOMBA. Haeckel (1.) 



Solitary Sponge with a proboscis. Bomb shaped, consisting 

 of a hollow sphere with a neck to it ; like Sycandra Ramsayi. 

 The diameter is 10-20 mm. The Sponge has no peduncle. The 

 cylindrical proboscis, 2-6 mm. in length. Osculum circular; 

 2-3 mm. in diameter. The surface of the Sponge is smooth ; 

 the Parenchyma very rigid. The body wall is 3-4 mm, thick, 

 and traversed by a large number of parietal canals, which are 

 very short and wide. These are situated radially and branch 

 dichotomously. Their Gastral mouths possess a diameter of 

 0-5-1 mm. The Gastral cavity is cylindrical or ovate, the direct 

 continuation of the cavity in the proboscis In the middle of the 

 body the diameter of the stomach is equal to the thickness of 

 the body wall. Above and below it is smaller. 



Spicules : The skeleton consists mainly of regular Triradiates, 

 which are larger in the Parenchyma than in the cortex. In the 

 latter their rays measure 0*1 — 0-2 x 0*008 — 0'012 mm., they are 

 pointed, conic, straight. They are coated by dense masses of 

 minute Acerates which form a cement (Stabchen-Mortel.) The 

 component parts of this cement, the minute Acerates, are straight 

 or slightly bent, pointed at one end and truncate at the other, 

 which shows incipient spines. They measure - 02 — 0"04 x 

 001 mm. Below this layer we meet with larger Triradiates not 

 so thickly set with minute Acerates. They are regular, their 

 rays measure 0-25—0-35 x 002— 0-025. The skeleton of the 

 Parenchyma consists of middle-sized regular Triradiates, with 

 m; stly straight, conic, and pointed rays, measuring 0*2 — 0*3 x 



(1.) E. Haeckel. L.c Band II., Seite 209: Band III., Tafel 33, figs. 

 2a-2f. Taf. 38, figs. 1-6 ; Tafel 40, fig. 9. 



