Catalogue of Non-Calcareoiis Sponges. 250 



The species is distinguished from Tedania digitata by the smooth- 

 ended tylote diactinal megascleres. As T. digitata may also con- 

 tain a good deal of sand I do not think the two species could 

 be distinguished with certainty without microscopical examina- 

 tion. The amount and disposition of the sand in T. coinmixta 

 varies much. 



The stations recorded for the species are 6, 9, x A, x B, Sorrento 

 Jetty. 



R.N. 417 ; 441 ; 444 ; 498 ; 505 ; 552 ; 606 ; 747 ; 768 ; 

 769; 772; 781; 863; 960; 996; 1062; 1148. 



Genus Sty/otrichop/iora^ n. gen. 



The main skeleton is a network of horny fibre cored with 

 foreign bodies. In addition to this there are smooth monactinal 

 megascleres (styli) and hair-like microscleres (rhaphides). 



The genus is perhaps related to Mai'shall's Phoriospoiigia, but 

 differs in the distinct reticulate horny fibre, and in the presence 

 of rhaphides instead of sigmata for microscleres. 



Stylotrichophora rubra, n. sp. 



The single specimen is compressed, lobose and little more than 

 half an inch thick. The surface is smooth and even. The vents 

 are very small and chiefly marginal. The texture is fairly 

 compact, resilient. The colour in life was coral red, disappearing 

 in spirit. 



Skeleton, the main skeleton is an irregular, wide-meshed 

 reticulation of stout horny fibre, everywhere abundantly cored 

 with foreign bodies (broken spicules), but with a layer of more 

 or less clear, transparent spongin outside the core. The primary 

 fibres are about 0-2o nnn. thick, sometimes more, and the 

 secondary, connecting fibres a good deal more slender. Between 

 these fibres is a loose but abundant spicular skeleton of slender 

 megasclei'es, for the most part irregularly scattered, but collected 

 into loose whisp-like fibres towards the surface. These spicular 

 fibres seem to spring from the horny fibres of the main skeleton 

 and bi'eak up at the surface into loose tufts of projecting styli 

 whose ends penetrate the dermal reticulation. 



