THE SPONGES. 155 



AXINELLIDAE Ridley and Dcndy. 

 Phakellia Bwk. 



1864. Pluikdlia Bowerbaiik, 1864, p. ]86. 

 1880. Fhukellia Bwk., O. Schmidt, 1S80, p. 81. 



Phakellia lamelligera, sp. nov. 



Plate 18, Fig. 10; Plate 19, Figs. 2, 3; Plate 35, Figs. 1, 3, 4. 



Diagnosiii. Sponge body a cup with much-fluted wall, fluting increasing toward 

 margin of cup. Wall of cup lamellate, 2-3 mm. thick, strongly hispid on both surfaces. 



Color light brown. Inner or oscular face of cup studded with oscula 300-500 ju, in 



diameter and about 1 mm. apart. Outer or pore surface studded with rounded pore- 

 menibraues 300-500 /* in diameter and about 1 mm. apart. Main afferent and efferent 

 canals alike, 300-500 /x wide, and passing radially into the lamella from tlie oscula and 



pore-membranes, respectively. Spicules. 1. Oxea, 540 x 32 ^. 2. Style, 400 x 30 fx. 



3. Style, 1275 x 28 /x. Skeletal framework a continuous reticulum made up of spiculo- 

 fibres which have the shape of flattened bands or lamellae extending at right angles to the 

 surfaces of the sponge. 



Station 3368, 1 specimen. 



Sponge body (Fig. .3, Plate 19) is a folded lamella which has assumed 

 the shape of a cup with a fluted wall. Cup is compressed from side to side, 

 and is thus wider in one horizontal axis than in the others. The folds in- 

 crease in extent from the base toward the free edge. Below, the cup nar- 

 rows to a base which is composed of two short irregular peduncular portions, 

 situated close together. Total height of cup, 63 mm. ; greater horizontal 

 diameter, 110 mm.; smaller horizontal diameter, 55 mm. Thickness of 

 lamellar wall in lower part of cup, 3 mm. Wall is thinner above, about 

 2 mm. thick just below the free edge. Edge itself is comparatively sharp. 

 Both inner and outer surfaces of the cup are hispid with closely set styles, 

 which project about 1 mm. beyond the surface. Consistency firm, but 

 sponge easily broken. Color, light brown. 



The- two surfaces are much alike, although one, the inner, is probably 

 the oscular, and one, the outer, probably the pore surface. From both sur- 

 faces numerous main canals 300-500 /x in diameter and about 1 mm. apart 

 pass radially into the body. They penetrate deeply into the body, the canals 



