Report on the Porifera collected Ьз' the Danmark Expedition. 477 



Fam. Leuconiidae. 



Leuconia Grant. 

 Leuconia ananas Mont. 



1818. Spongia ananas Montagu [21], p. 97, PI. 16, figs. 2—3. 



1872. Leuconia — Haeckel [11], p. 200, Taf. 32, fig. 5 a-f, Taf. 



40, figs. 1—8. 

 1898. — — Breitfuss [4], p. 223. 



1898. - - [5], p. 31. 



One specimen, oval, length 10 mm., breadth 4 mm., color whitish 

 yellow. 



Station 63. Stormbugt, hard bottom, 20— 40 m. 



Geographical distribution: Greenland, Spitzbergen, Mur- 

 man-coast, White-Sea, off Norway, Shetland Islands, English coasts, 

 Normandy. 



Depth: 10— 130 m . 



Glass II. Hexactinellida. 



Subclass I. Lyssacina. 



Order I. Hexasterophora, 



Fam. Rossellidae. 



Genus Rhabdocalyptus Jij. 



Rhabdocalyptus arcticus nov, spec. 

 PI. XXV, PI. XXVI, figs. 1-7. 



The present form is perhaps not at all a Rhabdocalyptus, but 

 for the present I refer the sponge to this genus, because its structure 

 and the greater part of the spiculation agree Avith those of Rhabdoca- 

 lyptus. The fact that makes me doubtful as to the right genus-deter- 

 mination is, that discohexacts are missing entirely, so far as I have 

 observed. The referring of the form to the genus Bathydorus is con- 

 tradicted by the presence of the big proslalia pleuralia. 



The sponge (PI. XXV) is cylindrical, somewhat compressed and 

 constricted towards the summit and the base; 3 specimens form a 

 little colony, the one, however, nipped off. The oscular opening 

 has a diameter of ca. 30 mm. in the biggest specimen, in the smaller 

 ca. 20 mm. The length of the biggest specimen is ca. 110 mm., by 

 40 mm., of the smaller 80 by 25 mm. The wall varies in thickness 



