Sollas — On Tetmctinellid Sponges. 193 



the outer collenchymatous layer without spicules. Spicules — 



(1) acerate, 475 by 0-07 mm. ; (2) fork, shaft, 3-5 to 4*2, by 

 0*12 mm. ; rays bifurcate ; primary rays about half the length of 

 secondary, which are 0*3 mm. long ; (3) anchor, shaft, 8*72 by 

 0*06 mm. ; (4) stellate sharp conical rays, small centrum ; rays 

 from 0*02 to 0-027 mm. ; (5) pycnaster, a comparatively large 

 centrum, provided with numerous short spines, with truncated 

 ends, 0*01 mm. in diameter. 



Habitat— Station 308, lat. 50° 8' 30" S. ; long. 74° 41' W. 

 175 fms. 



Grenus 5. Astrella, g. n. — Like Stelletta, but with only one 

 form of stellate, a pycnaster, i. e. with a small centrum, and short 

 blunt, numerous, rays. 



Astrella vosmaeri, sp. n. — Sponge, beehive-shaped, oscules not 

 distinguishable from the pores. Spicules — (1) acerate, 3*14 by 

 0*06 mm. ; (2) fork, shaft, 3 - 02 by 0-08 mm. ; arms bifurcate ; 

 primary rays, 0-088, secondary, 0*24 mm. long; (3) anchor, shaft, 

 3-61 by 0-028 mm ; arms, 0-04 mm. long ; (4) pycnaster, a com- 

 paratively large centrum and short, thick, truncated rays, 0*012 to 

 0*016 mm. in diameter. 



Grenus 6. Dragmastra. — Like Stelletta, but with a layer of 

 trichite sheaves in the cortex. Type, Dragmaster (Stelletta) 

 normani (Sollas), Norway. 



Genus 7. Stryphnus, g. n. — Stellettidse distinguished by the 

 absence of a radiate arrangement of the spicules of the choanosome, 

 only those which immediately approach the surface of the sponge 

 being arranged at right angles to it ; by the comparatively small 

 size and rarity of the fork spicules as compared with the acerates, 

 and chiefly by the presence of a curious irregular flesh-spieule — 

 the amphiastrella. The cortex is a vesicular collenehyme contain- 

 ing pigment cells. 



Stryphnus niger, sp. n. — Sponge, compound, massive, oscules 

 large, collected in groups. Spicules — (1) acerate, 2*4 by - 61mm. ; 



(2) fork, shaft, 0-446 by 0-0356 mm. ; arms bifurcate; primary 

 rays, 0*055, secondary, 0*079 mm. long ; (3) anchors ; (4) stellate, a 

 small centrum and numerous slender conical-shaped pointed rays, 

 0-014 mm. long; amphiastrella, various, typically a short cylin- 



SCIEN. PROC. K.D.S. — VOL. V. PT. IV. P 



