REPOUT ON THE TETRACTINELLIDA. 
183 
Schmidt’s representations of the spicules of this sponge are so misleading, 
that no one without access to the type could identify it. The spinose styles which he 
describes and figures are not present, nor, though one might imagine so from the figure, 
are orthodragmas. The sponge is so similar to Astrella ance'ps, 0. S., that it is only 
after considerable hesitation that I venture to keep the two species as distinct. The 
form of the cladome of the plagiotrisene in Astrella pumex, due to the very forwardly 
directed curve of the cladi, appears however to be somewhat characteristic. The spicules 
appear to be very variable in dimensions; those given are maxima. The reference of 
the species to Astrella is only doubtfully made. 
Subfamily 2. Euasterina. 
Anthastra seruginosa (Carter). 
Stelletfa Brurjinosa, Carter, Ann. and Mag. Nat. Hist., ser. 5, vol. xvii. p. 123, 1886. 
Sponge spherical, sessile ; surface smooth ; oscules distinct, irregularly scattered ; 
pores in sieves ; ectosome thin, 0'32 mm. in thickness. 
Spicules. — I. Megascleres. 1. Oxea, IT 17 by O'Ol mm. 2. Orthotrisene, rhabdome 
1’456 by 0'0125 mm., cladi 0*238 mm. in length, chord 0*42 mm. 3. Anatrisene, rhab- 
dome 1*03 mm. long and probably longer, by 0*013 mm. in diameter; cladome small, 
well rounded in front, cladi 0*03.2 mm., chord 0*045 mm., sagitta 0*029 mm. in 
length. 
II. Microscleres. 4. Anthaster, with few actines, each 0*012 mm. long. 5. Chiaster, 
numerous fine hair-like actines, not tylote, a minute spherical centrum sometimes 
present; 0*016 mm. in diameter. 
Colour. — Verdigris-green or blue throughout. Size, 25 mm. in diameter. 
Habitat. — Port Phillip Heads, South Australia ; depth, 6 fathoms. 
Remarks.— Mx. Carter generously presented me with a whole specimen of this sponge. 
It does not present the green colour from which the species takes its name. The oscule 
is small, with a well-defined margin, and leads into a small cloaca ; neither the margin of 
the oscule nor the walls of the cloaca are hispidated by small oxeas. The small rounded 
cladome of the anatrisene is characteristic. 
Anthastra mamrnilliformis [Oaxt&r). 
Stelletta mammiliiformis, Carter, Ann. -and Mag. Nat. Hist., ser. 5, vol. xvii. p. 124, 1886. 
Sponge globoconical, mammilliform, sessile ; surface more or less covered with 
attached grains of sand ; oscule single^ terminal, large. Ectosome thin ; not a cortex. 
