192 Scientific Proceedings, Royal Dublin Society. 



Anthastra parvispicula, sp. n. — Sponge small, spherical, free, a 

 single small oscule. Spicules — (1) acerate 1-3 by 0*02 mm. ; 

 (2) fork with simple arms, shaft, 1*75 by 0'02 mm. ; arms, 21 

 mm. long ; (3) anchor, shaft, 1*3 by 0*016 mm. ; rays, 0-045 mm. 

 long; (4) anthaster as in A. pulchra; (5) chiaster, rays not capitate, 

 0-0118 mm. long. 



Habitat— Station 161 ; [lat 38° 21' 30" S. ; long. 144° 36' 30" E. 

 33 fms. 



Genus 4. Ecionema, Bwk. — Similar to Anthastra, but with the 

 oscules confined to the summit, the excurrent tubes running longi- 

 tudinally and vertically through the sponge. 



Ecionema ridleyi, sp. n. — Sponge ovate, several small oscules 

 on the summit. Spicules — (1) acerate, 4*07 by 0-118 mm. ; 



(2) fork, with simple arms, 4*3 by 0-118 mm. ; arms, 0*27 to 

 0'32 mm. long ; (3) anchor, shaft, 3-6 by 0'03 mm. ; rays, 

 0*103 mm. long ; (4) anthaster, small ; rays few or numerous ; a 

 single ray of a tetrad form, 0-01 by 0*004 mm. ; (5) chiaster, rays 

 slender, hair-like, capitate, 0-016 mm. in diameter. 



Habitat. — Port Jackson. 30-35 fms. 



Ecionema pyriformis, sp. n. — Sponge obconic, attached by flat 

 base, summit bearing numerous small oscules; pores in sieves, 

 generally distributed over the sides ; chief excurrent canals vertical. 

 Spicules— (1) acerate, 3-14 by 0-095, to 4 by 0-104 mm. ; (2) fork, 

 shaft, 3-02 by 0*095, to 3-72 by 0-163 ; arms bifurcate ; primary 

 rays, 0*1114, secondary rays, 0*1114 to 0-175 mm. in length ; 



(3) anchor, shaft, 2*1 by 0*023 mm. ; rays, 0-016 mm. long; 



(4) anthaster, bacillary rays with rounded ends, microspined, 

 usually 4 to 7 in number ; a single ray of a tetrad form, 0-013 by 

 0-004 mm. ; (5) chiaster rays capitate, 0-008 mm. long. 



Habitat. — Port Jackson. 30 to 35 fms. 



Genus 4. Stelletta, Schmidt. — Ectosome a thick cortex, 

 traversed by chones. Spicules, two kinds of stellates, one with 

 conical pointed rays. 



Stelletta phrissens, sp. n. — Sponge, globular or cylindrical, 

 attached ; surface hispid, with spicules which project 6 to 7 mm. 

 beyond it ; oscules small, congregated ; pores in sieves ; cortex thick, 



