62 PORIFERA. I. 



all points of contact. Also in this species some extraneous bodies are found iucrusted, but to a far 

 slighter degree than in the preceding species. 



Spiciila are curved oxea, of equal thickness throughout their length; their point is short and 

 stubby, sometimes with a little outermost apex especially marked off. The spicules are rather varying 

 in length, from 0-178— 0-24""", and also the thickness is somewhat \ar>iug, from ca. o-ooS—o-oia"'"', the 

 longest ones being far from always the thickest. Developmental forms, down to quite fine ones 

 occur, but in small numbers; the finest have a length of ca. o-iSS""". The developmental forms are 

 long tapering, but b}- and b}', as the thickness increases, the points become shorter. 



Locality: Station 97, 65 28' Lat. N., 27° 39' Long. W., depth 450 fathoms, four specimens. 



Remarks. In this species cells filled witli granules are found, but in smaller numbers and of 

 considerably smaller size than in the preceding ones; forms with radiated structure were not found. 



Fam. II. Heterorrhaphidae. 



Subfam. i. Gelliinae. 



Gellius Gray. 



The form exceedingly varyi)ig ; it may be quite irregular, but it may also be definite and regular. 



for instance leaf-shaped, ealiciilar. or pyriform. The skeleton is a more or less regular netivork or quite 



irregular, of renicroid or halichondroid structure, and long fibres are ?iot found. The mass of spongin 



is rather small, and does not quite surround the spicules or the fibres. Spicula: Megasclera diactinal, 



oxea or strongyla : microsclera sigmata, sigmata and toxa. toxa, sigmata and raphides. or raphides alone. 



The geuus is chiefly distinguished from Gelliodes by a more reticular skeleton without long 

 fibres; the relation, therefore, between Gellius and Gelliodes is about like that between Rieuima and 

 Destnacella. 



I. G. arcoferus \'osm. 

 PI. XII, Fig. iia, b, c. 



1885. Gellius arcoferus \'o.smaer, The sponge of the \'illeni Barents Exp. 1880 — 81. Bijdragen tot de 



Dierk., i2te Aflew 3 Oed. 29, PL IV, fig. 18, PL \', figs. 87—90. 



1887. — — Fristedt, Vega Exp. vetensk. lakttag. I\', 430, PL 24, fig. 29 — 31, PL 28, fig. 16. 



1896. — — Lambe, Sponges from the Atlant. Coast of Canada. Transact. Ro\'. Soc. of 



Canada, Ser. 2, II. vSect. W , 184, PL I, fig. 3, 3 a— b. 



Leap-shaped? Spicula: Megasclera oxea o-^j""" : microsclera toxa o-o^y — o-iyS""". sigmata 



0'0I2 — 0-OJp""". 



Of this species we have onh a little fragment; its form is compressed, and its one undamaged 

 edge is rounded, so that it might be a piece of an erect, flat sponge; its colour (in spirit) is yellowish 

 gray. Although \"osmaer gives no measures of the spicules in Gellius arcoferus, there can scarcely 



