444 



This curious species was taken by the Ingolf-expedition 

 on station 94, 64° 56' lat.N., 36° 19' long.W., depth 204 fathoms. 



Hymedesmia Bow. 



(Leptosia Tops.) 



H. Dujardinii Bow. 



1866. Hymeniacidon Dujardinii Bowerbank, Mon. Brit. Spong. II, 224, 38, 



et ibid. 1874, III, PI. XXXVIII, figs. 1—4. 



A specimen, growing on a shell of Pecten imbrifer^ 

 Forsblad-Fjord, depth 50 — 90 fathoms (The Amdrup-expedition 

 1900). 



Besides this well known species there are in the collections 

 still six species, all new and not yet described; this genus is 

 thus represented at East-Greenland by seven species in all. 



Ectyodoryx n. g. 

 In "Kieselschwämme von Ternate", ]1 (Abhandl. der Sencken- 

 berg. nat. Gesell. XXV, 953) Thiele has shown, that the 

 genus formerly called Dendoryx must have the name Myxilla 

 with the typical species rosacea Lieberkiihn, and Dendoryx is 

 thus a synonym to Myxilla. In "The Danish Ingolf-Exp." VI, 2, 

 154, I have emended the genus Lissodendoryx in such a way, 

 that Myxilla comprises species with ancoræ and Lissodendoryx 

 species with chelae. Both these genera belong to the sub- 

 family Mycalinae; but in the subfamily Ectyoninae we then 

 have the genus hitherto known as Myxilla i. e. a genus ans- 

 wering to Myxilla. and with the skeleton reticulate, but with 

 accessory spicules (the ectyonine character). This genus also 

 must be divided in two, one with ancoræ and the other with 

 chelae, the first thus answering to Myxilla and the other to 

 Lissodendoryx. — It is possible, that some old species in a 

 Bowerbankian or other genus will be found to belong to those 

 genera, and perhaps in such a way, that we therefrom should 

 get the necessary names for the genera, but I am not able to 

 decide this from the literature, and for the rest I think it not 



