BY R. VON LENDENFELD, PH.D. 1119 



008 X 0-011, and larger pyramidal ones the rajs of which are 

 curved S shaped. The proximal ends are turned towards the 

 axis and the distal ends away from it, so that the whole 

 represents a tripod (I.e., fig. 16.) Their rays measure 0-13 x 

 04. The dome-shaped central part underlies the surface of the 

 Sponge, the rays point centripetally. 



Locality : South-west Coast of Australia. Carter. 



18. GENUS. LEUCALTIS. Von Lendenfeld. 



Leuconidfe, with triradiate and quadriradiate, but without 

 acerate spicules. This genus is nearly identical with Haeckel's 

 (1) genus Leucaltis. 



35. SPECIES. LEUCALTIS HELENA. Nov. spec. 

 Oval, elongate or cylindrical, solitary Sponges attaining a 

 length of 25 and diameter of 15 mm., with circular transverse 

 section. No frill to the Osculum. Gastral and dermal surface 

 smooth. Gastral cavity large ovate. Thickness of the body 

 wall 2 mm. The inhalent pores lead into large cylindrical canals, 

 which are 0-2 mm. wide, and extend longitudinally just below 

 the surface. From these tangental subdermal Lacune-canals, 

 tubes originate which extend, more or less regularly, radially in 

 a centripetal direction towards the Gastral cavity. Below the 

 Gastral surface, which is perforated by distant circular pores, 

 with from 0-5 — 1-5 mm. diameter, likewise longitudinal lacunose 

 canals extend, which are very irregular and have an average 

 diameter of 0*4 mm. From these, radial tubes, extending centri- 

 fugally originate. Between these and the inhalent tubes described 

 above, there is one layer of spherical ciliated chambers which 

 measure 0-1 mm. The canal system is like that of Aplysilla. 

 When the canal system of a greater number of species will be 

 better known it will afibrd characters for the establishment of 

 classificatory categories. 



(1.) E. Haeckel. L.c. Band II., Seite 142. 



