433 



Fam. Heterorrhaphidae. 

 Gellius Gray. 

 G. varius Bow. 

 PI. XIV. Fig. 3 a, b. 

 ^1875. Halichondria varia Bowerbank, Proc. Zool. Soc. 292. 

 1884. GelliuH varius, Ridley, Rep. of Zool. Coll. made during the Voy. of 

 H. M. S. "Alert" 1884, 424. 



We have a small specimen, probably only a fragment, which 

 1 identify as G. varius Bow. Its greatest extent is only 17 mm. 

 The colour (in spirit) is brown. 



It is very difficult for the present to determine with cer 

 tainty a Gellius species belonging to the group with the spi- 

 cuiation consisting only of oxea and sigmata, because the species 

 of this group have hitherto neither been thoroughly described 

 nor figured. When I determine the present species as varius 

 Bow., I do so chiefly because the sizes of the spicules agree 

 best with this species, while G. couchi Bow, and G. fibulatus 

 O. S. have thinner oxea (se Ridley 1. c). The oxea of the spe- 

 cimen in hand are evenly [curved, sometimes the curve is loca- 

 lized more or less distinctly in the middle; they are of the 

 same thickness in the whole length, the points are short and 

 bounded by curved lines, the very apex bears a little mucro. 

 The length of the oxea is 0*26 — 0*3 mm and the thickness 

 €'014 mm. The ends of the oxea are connected by a distinct 

 mass of spongin. The sigmata are of common shape and they 

 are plane , their length is О'ОЗб mm and the thickness is 

 0-0015 mm. 



Cape Tobin, depth 57 fathoms (The Amdrup-expedition 

 1900). 



G. arcoferus Vosm. 



Î885. Gellius arcoferus Vosmaer, Bijdrag. tot de Dierk. 12te All. 3die Ge- 



deelt. 29, PI. IV, tig. 18, PI. V, figs. 87—90. 

 1902. — — , Lundbeck, The Danish Ingolf-Exp. VI, 1, 62, PI. 



XII, figs. 11 a, b,c. 



Only a small fragment. 



