445 



at all probable. I then se no other way than the creating of 

 new genera for the mentioned two groups of species. — The 

 genus with chelae 1 give the name Ectyodoryx, and for the 

 genus with ancoræ, which is not represented in the material 

 treated here, I propose the name Ectyomyxilla. 



The generic diagnosis for the genus Ectyodoryx may then 

 be the following: 



Sponges with a reticulate skeleton, echinated (more or 

 less sparingly) by accessory spicules. The skeleton spicules 

 spined or smooth styli, the accessory spicules smaller, spined 

 styli; the dermal spicules diactinal; microscleres isochelæ ar- 

 cuatse solely or together with other forms. 



E. foliatus Frstdt. 



1887. Hastatus foliatus Fristedt, Vega-Exp. vetensk. lakttag. IV, 443, PI. 

 25, figs. 7—12. 



This species of which 1 have examined the type specimen, 

 is an Ectyodoryx, as it has accessory spicules (1. с flg. 8) 

 echinating the fibres, but the accessory spicules are few in 

 number. 



East-coast of Greenland, depth 130 fathoms (The Swedish 

 arctic expedition 1883; Fristedt I. c). 



E. sp. 

 We have another species of this genus, not yet described, 

 from Rathbone 0, depth 94 fathoms, and from Angmagsalik, 

 depth 140 fathoms (The Amdrup-expedition 1900). 



Pocillon Tops. 

 P. sp. 

 A species of this genus has been taken at Angmagsalik, 

 in shallow water (Kruuse). 



Stylosdchon Tops. 

 The views of the two genera Plumohalichondria Cart, and 

 Stylostichon Tops, have been somewhat confused so that I shall 

 say some words about them. — In 1892 Top sent has (Ré- 



29* 



