8]Jon(jes from South Australia. 125 



spicules, stellates of two sizes as usual, viz. 6- and 4-6000ths 

 in. in diameter respectively. Pigmental cells globular or 

 slightly elliptical, distinctly nucleated and graiiuliferous, 

 granules brown, sometimes colourless ; cell 4-6000ths in. in 

 diameter, granule l-6000tli in. Structure compact, consisting 

 from without inwards of a thin tibrous dermis charged with 

 grains of sand, pigmental cells, and stellates, in which are 

 imbedded the distal ends of body-spicules together with the 

 tetractinellid heads of the zone-spicules. Size about \ in. in 

 diameter. 



Depth not mentioned, being one of a great number of 

 small specimens tied up in a cloth. 



Ohs. There are two of these which have grown together, 

 indicative of their having belonged to a group, thus growing- 

 like the yellow variety of Tetliya {Stelletta) dactijloidea, 

 Carter, in the sandy estuary of Mahim at Bombay (' Annals,' 

 1869, vol. iii. p. 15, and 1872, vol. ix. p. 82). 



31. Stelletta geodldes. 



Subglobose, sessile. Consistence hard. Colour when 

 fresh " dark slate," the same now. Surface minutely granu- 

 lated over low mulberry-like elevations. Vents small, nume- 

 rous, in the grooves between the elevations. Spicules of four 

 forms, together with a pigment-cell, viz. : — 1, body-spicule, 

 as usual a long large acerate, about 600 by 6-6000ths in. ; 



2, zone-spicule or tetractinellid, in which the arms are simple, 

 very short and thick comparatively, rather recurved and pro- 

 jected forwards and laterally, head 20-6000ths in. in dia- 

 meter, shaft 375 by 6-6000ths in. No anchors or forks seen. 



3, flesh-spicules, solid, elliptical, microspined all over, 2 

 by f-6000th in. ; 4, flesh-spicule, stellates varying under 

 5-6000ths in. in diameter. Pigmental cell large, globo- 

 elliptical, 10 by 8-6000ths in. in diameter, distinctly nucleated 

 and granuliferous, granules large and brown-coloured. 

 Structure from without inwards consisting of a dark cortex 

 about 77 in. in thickness, of which the outer half is composed 

 of a layer of the flesh-spicules, nos. 3 and 4, imbedding the 

 distal ends of body-spicules and the heads of the zone-spicules ; 

 and the inner half is composed of the subdermal cavities cir- 

 cumscribed by tissue charged with the pigmental cell, followed 

 by the body-substance, which chiefly consists of the body- 

 spicules and the sarcode scantily charged with stellates and 

 plentifully traversed by the canals of the excretory system 

 which end in the vents mentioned. Size 2^ in. in diameter. 



Depth 13 fath. 



Obs. The cortical layer, which in its outer half is chiefly 



