Sponges 5 j 



Halichondria panicea Johnston 

 For literature, synonymy, etc., vide Ridley and Deridy (1887) and Dendy 



There are about twenty-five specimens and a number of fragments of this 

 very common species in the collection. Tne form varies from encrusting or 

 massive to digitate. 



The skeleton arrangement and spiculation are typical, so no further des- 

 cription is necessary. 



Register Numbers, Localities, etc. — XI, XVI: Station 20g, Port Clarence, 

 Alaska, 2-3 fathoms, sandy mud, August 4, 1913. — XIV, 1: Station 23, lat. 

 70° 24' N., long. 161° 25' W., 9-10 fathoms, grey mud with pebbles, August 19, 

 1913.— XV, 2, 3 and XVIII, 2: Station 20d, Teller Alaska, July, 1913.— XVII, 

 1: Station 206-c, Grantley harbour, Alaska, July 30, 1913. (All Canadian 

 Arctic Expedition, F. Johansen coll.) 



Phakellia variabilis (Vosmaer) 



Cribrochalina variabilis Vosmaer (1882). 

 Cribrochalina Sluiteri Vosmaer (1882, 1885). 

 Reniera infundibuliformis A. Hansen (1885). 

 Cribrochalina Sluiteri Levinsen (1887). 

 Cribrochalina variabilis Fristedt (1887). 

 Placochalina Sluiteri Lbndenfeld (1887). 

 Cribrochalina Sluiteri Swartschewsky (1906). 

 Tragosia Sluiteri Lundbeck (1909). 

 Tragosia Sluiteri Hentschel (1916). 



There are three spirit and ten dried specimens in the collection. All are 

 lunnel-shaped, resembling closely specimens described and figured by Vosmaer 

 and Levinsen, and ranging from 25 to 130 mm. in total height. The colour 

 in spirit is brownish grey; that of the dried specimens varies from dark brown 

 to almost white. Texture soft and flexible. 



The skeleton arrangement and spiculation are typical.. 



Because of the absence of trichodragmata we propose to remove this sponge 

 from the genus Tragosia [vide Dendy (1922)], and place it in the genus Phakellia. 



Vosmaer (1882, 1885) makes two distinct species of "Cribrochalina," 

 namely C. variabilis and C. Sluiteri. We can see nothing in his description to 

 justify this and regard C. Sluiteri as identical with C. variabilis, the latter specific 

 name being retained as it was the first given. 



Register Numbers, Localities, etc. — XIV, 2: Station 23, lat. 70° 24' N.j 

 long. 161° 25' W., 9-10 fathoms, August 19, 1913.— XXI: Station 26, beach 

 on Spy island (Thetis islands), Alaska, September 3, 1913.— XXIV, 1, 2, 3, 4: 

 Station 24, beach at Point Barrow sandspit, Alaska, August 22-23, 1913. — 

 XXV: Station 28, 1, m, beach at Collinson point (Camden bay), Alaska, June 

 1914. (All Canadian Arctic Expedition, F. Johansen coll.). 



Ficulina ficus (Linn6) Gray 



For discussion and synonymy vide Topsent (1900.) 



There are about a dozen specimens in the collection, and a number of frag- 

 ments, R.N.X., which is yellowish grey in colour and has evidently been growing 

 free, is ovoid and flattened in one plane, measuring 30 by 27 by 14 mm.; R.N. 

 IV, which is dull greyish brown in colour, forms an irregular mass growing 

 round a seaweed; R.N. XII consists of two minute, sub-spherical specimens, 



