276 



appear. As usual their cladomes mark out the limit between the 

 parenchyme and the cortex. In addition to these spicules a few 

 anatriaenes and asters occur. In the cortex we find a pheripheral 

 layer of spherasters and under these about six layers of sterrasters. 



Spicules. Oxea. Stout, soraewhat curved. 



Orthotriaene. Rhabdome rather stout, straight, sharp-pointed. 

 Cladi waved or straight, rather long. 



Dichotriaene. Rhabdome long , rather stout , straight and sharp- 

 pointed. The angle (p is about 110°. Procladi as a rule longer 

 than the deuterocladi. 



Anatriaene. Not frequent. Rhabdome long, slender. Cladi short 

 and stout. 



Oxyaster. Very frequent, especially in the parenchyme. Actines 

 long and slender. 



Spheraster. Frequent everywhere, but especially in the cortex. 

 Actines pointed, many. 



Sterraster. Spherical or ellipsoid. 



Found between Naples and Capri; 150 — 200 meter. 



Caminus vulcani O. S. 



Cf. Schmidt, Spong. Adriat. Meeres (1862) p. 48; PI. III fig. 

 27 and PI. IV, fig. 6. 

 Sollas, Chall. Tetractin. (1888) p. 241—242. 



The shape of Caminus vulcani O. S. is spherical, oval or ellips- 

 oid, attached sometimes with a broad base to stones, corals or 

 shells. Once I saw a short pedicel. The surface is smooth , as no 

 spicules are hispidating. With a pocket lens a net-like figure can 

 be seen. Generally there is but one single proct ; I have seen 

 one specimen with three procts. The size is from 0.7 X 0.7 to 

 5X10 cm. in diameter. The colour is yellowish or pale greyish ; 

 according to Schmidt also dark-coloured specimens occur. 



A section through the proct of a living sponge shows us a 

 yellowish parenchyme and a greyish cortex. Two or three main 

 excuirent canals are visible , around which the colour is more 

 bluish transparent , owing to the hyaline connective tissue. In 



