BY R. VON LENDENFELD, PH.D. 1105 



lanceolate, sharp pointed ; the lanceolate straight the spindle-shaped 

 either straight or slightly curved ; attaining a length of 1 mm. and 

 a diameter of 0-05 mm. ; a few much shorter and stouter, the 

 pi'ojiortion between the length and the thickness being 6:1 

 Sparsely scattered in the pax-enchyma, their free end projecting 

 from the outer surface being usually broken off ; piercing the wall 

 perpendicularly to the longitudinal axis of the Sponge. 



Colour : Pale yellowish. 



Locality: Station 163a, June 3, 1874; oif Port Jackson, 

 East Coast of Australia ; depths, 30 to 35 fathoms ; rock. (Chal- 

 lengei'.) 



23. SPECIES. AMPHORISCUS CYATHISCUS. Haeckel (1.) 

 SYCILLA CYATHISCUS. E. Haeckel (2,) 



Radial tubes prismatic, coalesce entirely with their sides, no 

 distal cone. Dermal surface plain, smooth, Gastral surface with 

 short spines. The skeleton consists of quadriradiate spicules. 

 The quadriradiate spicules of the skeleton possess throughout 

 sagitally diiferentiated facial rays and form four layers : — 

 1. A dermal layer of parallel quadriradiate sjMcules, the 

 straight basal ray and the knee-shaped lateral rays are situated in 

 the dermal surface, whilst the centripetal apical ray penetrates the 

 distal half of the gastral wall. 2. A subdermal layer, which is 

 perfectly similar to the dermal one, and which lies just underneath 

 it. 3. A subgastral layer of parallel quadriradiate spicules, the 

 facial rays of which are situated underneath the gastral layer, 

 whilst the centrifugal apical ray which is two to three times as 

 long as the former, penetrates the greater part of the gastral 

 wall. 4. A gastral layer of parallel quadriradiate spicules, the 

 fascial rays of which lie in the gastral surface. The apical ray is 

 much shorter and protrudes into the gastral cavity. The dermal 



(1.) E. Haeckel. Prodromus eines Systems der Kalkschwamme Jenaische 

 Zeitschrift fur Medicin und Natur Wissenschaft, 1870. Band V., Heft. 2, 

 p, 238. 



(2.) E. Haeckel. Die Kalkschwamme, Eine Monographie. Band II., p. 

 250, Taf. XLIII., figs. 8-11, Band III. 



