280 



The stomas lead into distinct chones , which are of course 

 very short, the cortex being very thin. No differentiatiou can be 

 seen in endo-ehone and ecto-chone. Subcortical crypts small; 

 from here start the incurrent canals, which ramify soon and ter- 

 minate into narrow prosodi. Aphodi and prosodi have about the 

 same size. 



The skeleton of the cortex is maiuly formed by centrotylote 

 microxeas. The parenchymal skeleton is formed by bundies, which 

 consist chiefly of oxeas ; towards the periphery just under the 

 cortex of dichotriaenes. Bet ween the bundies of megascleres asters 

 occur abundantly. 



Spicules. Oxea, Sharply pointed , generally curved. 



Dichotriaene. Rhabdome short, at least not very long. Pro- 

 cladi normally shorter than the deuterocladi. 



Oxyaster. Of various size; actines generally long, conical. Trans- 

 itions to spherasters are not uncommon. 



Microxea. Slightly curved , as a rule incipiently centrotylote. 

 I do not know why Schmidt says that the ends are blunt; nei- 

 ther in my specimens, nor in an original piece from Schmidt 

 I found thera blunt, they were on the contrary sharply pointed. 



Found between Capri and Naples, 150 to 200 meter. 



Stryphnus mucronatus (O. S.) Soll. 



Syn. 1868 Stelletta mucronata O. S. 

 1880 Stelletta carbonaria O. S. 

 1888 Sryphnus carbonarius (O. S.) Soll. 

 1888 Stryphnus mucronatus (O. S.) Soll. 

 Cf. Schmidt, Spong. Kuste Algier (1868) p. 19; PI. IV, fig. 2. 

 Schmidt, in Arch. Mikrosk. Anat. XVIII (1880) p. 280—281. 

 Sollas, Chall. Tetractin. (1888) p. 192—193. 

 Marenzeller in Ann. K. K. Naturhist. Hofmus. Bd. IV (1889) 

 p. 16-17) PI. II, fig. 4. 

 I have united Stelletta mucronata O. S. and Stelletta carbona- 

 ria O. S. on account of the statements of Marenzeller and of a 



