2-)() gp:odia media. 



rouiuliHl, fully tlovoloiied <nu's conical, pointed, convex to rlialxloinc througliout 

 their length, 90-260 /< long, over 200 /£ only in monacnes; clade-angles 113-147°. 



0.vyas(ers: from six to fifteen smooth, conical rays; total diameter 17-32 fi. 

 Oxysphaeraslers: from five to thirty and more conical rays, 1.4-4 fi thick, rays 

 usually smooth, rarely with one or two stout spines; centrum 4-12 /(, whole aster 

 16-31 /(, in diameter. Stenasters: 55^02 (Lendenfeld, 1888, 67 /i) by 50-59 by 

 45-54 n. 



Southwestern Pacific. East coast of Australia ; Broughton Island. 



Geodia media BowEnnANK. 



Proc. Zool. soc. Lonilon, 1S73, p. 13, plate 2, figs. 24-29. Lendrnfeld, Ante, p. 191. 

 Sijnops (?) media Sollas, Rept. voy. "Clialloiiger" 1888, 25, p. 26G. 

 Sidonops media Lendenfeld, Ticrrcich, I9().'5, 19. p. 103. 



^ The following descrii)tion is also based on an examination of part of the 

 ty\w specimen in the British Museum. 



Massive, irregular, with depressions, in which are conspicuous sieve-covered 

 canal-entrances; more rarely digitate. In spirit and dry: light brown or buff 

 yellow. 



Large amphioxes: slender and stout; 1-1.7 mm. by 23-51 fi. Large styles: 

 not numerous; 0.9-1.3 mm. by .30-50 /x(not mentioned by Sollas, 1888). Large 

 irregular rhabds: angularly bent or with one or more branch-rays, often numer- 

 ous; dimensions as in the regular amphioxes and styles (not mentioned by 

 Bowerbank, 1873, or SoUiis, 1888). Minute dermal styles: attenuated towards 

 the rounded end; 140-265 by 2-6 ^« (not mentioned by Bowerbank, 1873, or 

 Sollas, 1888). Slender plagiotriaenes: rhabdome 1-1.6 mm. by 17-30 /«; chides 

 strongly concave to rhabdome throughout their whole length, 160-260 /i long; 

 clade-angles 107-114°. Stout plagiotriaenes: rhabdome 0.8-1.7 mm. by 30-80 /( 

 (Sollas, 1888, 45 (error 450) //) ; clades slightly concave to rhabdome or nearly 

 straight, 110-310 /i long; clade-angles 105-120°. Mesomonaenes: orthoplagio- 

 or proclade; rather scarce; rhabdome 1.7-2.5 mm. by 4-10 /r, clade 17-50 fi 

 long; clade-angle 32-89°; epirhabd 40 75 /i long (not mentioned by Bower- 

 bank, 1873, or Sollas, 1888). Amphiox-like derivates of the mesoclades: of similar 

 dimensions; with the clade more or less completely suppressed (not mentioned 

 by Bowerbank, 1873, or Sollas, 1888). Anatriaenes: scarce; rhabdome 10-15 /i 

 thick; clades 23-35 ft long; clade-angles 44-52° (not mentioned by Sollas, 1888). 

 Mesanatriames: very rare, not always present; rhabdome 0.8 mm. long, termi- 

 nally thickened and rounded; clades similar to those of the anatriaenes; epi- 

 rhabd 165 /i long. 



