BY R. VON LENDENFELD, PH.D. 1129 



ones predominate throughout. The slender ones are more 

 numerous towards the outer surface. The rays of the stout 

 spicules measure - 28 x 0021, those of the slender ones have the 

 same length, but are only 0)7 mm. thick. Among the Trira- 

 diates there are also a few small Quadriradiates with spicules 

 corresponding to those of the slender triradiate spicules. Transi- 

 tion forms between these Quadriradiates and the slender Triradiates 

 are present in great abundance. Transition forms between the 

 slender and the stout triradiate spicules do not exist. 



The acerate spicules are spindle-shaped and pointed at both 

 ends. They measure 1*5 mm. x 035 mm. These are rare. 

 Around the Osculum there are no differentiated spicules. 



Locality : East Coast of Australia, Port Jackson, 10-20 fathoms. 

 Yon Lendenfeld. 



43. SPECIES. LEUCANDRA CATAPHRACTA. E. Haeckel (1). 



This Sponge consist3 of solitary persons of an elongate cylin- 

 drical or flattened shape, they are slightly spindle-shaped, a 

 narrow peduncle and narrow oscular part are generally met with. 

 These cylinders attain a length of 20 to 30 mm., by a diameter of 

 6 mm. The Gastral cavity is narrow only J to | of the diameter 

 of the outer cylindrical surface. Osculum present without frill. 

 On the surface of the stomach there open a great number of very 

 fine Gastral pores, which lead into minute perietal- canals. On a 

 longitudinal section through the wall these latter are hardly 

 visible. 



Skeleton : The main mass of the skeleton is in this species, 

 quite different from all the others, formed by several layers of 

 longitudinal enormous acerate spicules, which lie parallel to the 

 dermal surface. They are coated and united by a cement, which 

 consists of small, mostly sagittal triradiate spicules. The large 

 acerate spicules are spindle-shaped, either tapering to both ends, 

 or inflated on the oral side, mostly slightly curved, rarely 

 straight, 1 to 3 mm., 0*15 to 0*2 mm. All Acerates lie in alongitu- 



(1.) E. Haeckel. L.c. B ami II. Seite 203., Band III., Taf. XXXII., 

 figs. 6a-6f ; Taf. XXXVII., fig. 2. 



