248 GEODIA ACANTHTYLASTKA. 



Geodia lophotriaena Lendenfeld. 

 Ante, p. 181. 



Cushion shaped. Inspirit: brownish. 



Large choanosomal amphioxes: 1.2-1.8 mm. by 25-42 jx. Minute dermal 

 rhabds: mostly bhmt amphioxcs, rarely styles; 110-200 by 3-6 /(. Plagio- 

 triaenes: rliabdomc 0.0-1.2 mm. by 25-35 /(, sometimes reduced in length and 

 rounded terminally; elades. concave to the rhabdome throughout, 140-195 // 

 long; elade-angles 102-114°. Dichotriaenes and other lophotriaenes: the former 

 more frequent than the latter; rhabdome 0.8-1.2 mm. by 35-59 /«; main elades 

 70-140 /(, end elades, of which there are in the lophotriaenes from three to five, 

 70-80 /{ long; main clade-angles 105 130°; breadth of cladome 300 500 /<. 

 Mcsoprotriacnes: rhabdome about 1.3 mm. by 4-9 /t at the cladome, and 7-11 /< 

 at the thickest point near the middle; elades 44-80 /( long; clade-angles 32-41°; 

 epirhabd 38-60 /i long. Large anatriaenes: rhabdome 8-13 /( thick; elades 60- 

 85 p long; clade-angles 41-50°. Minute dermal anatriaenes: rhabdome 170- 

 210 by 1-3 p at the cladome, and 2-4 p at the thickest point near the middle; 

 elades 4-9 p long; clade-angles 49-67°. 



Large oxy asters: from four to eleven smooth, conical rays, 1-2.2 p thick; 

 centrum small; total diameter 15-41 p. Sphaerasters: from seven to twenty- 

 two or more, usually cylindroconical, truncate, rarely conical and pointed, usually 

 spined rays, 0.8-2.4 p thick; centrum 2-8 p, whole aster 7-22 /(, in diameter. 

 Stcrrastcrs: mostly 30-45 by 33-44 by 27-35 p; a few larger ones, up to 58 /( 

 long, also observed, these perhaps foreign. 



? Southwestern Pacific. Probably New Zealand. 



Geodia acanthtylastra Lendenfeld. 



Ante, p. 188. 



Irregularly spherical, oval or tuberous. In .spirit: brownish white. 



Large amphioxes: 0.7-2.2 mm. by 14-40 p. Minute dermal rhahds: for the 

 most part amphioxes, styles also present, but rare; 150-300 by 3-15 p. Minute 

 amphioxes: 41-53 by 1-1.2 p; perhaps foreign. Plagiotriaenes: rhabdome 

 1.2-2.5 mm. by 40-77 p; elades concave to the rhabdome throughout, or only 

 basally and distally straight, 160 260 p long; clade-angles 100-116°. Irregular 

 plagiotriaenc-derivates: of similar dimensions; either with another clade besides 

 the three ordinary, or with bifurcate elades (some regular dichotriaenes were 

 observed, but these may be foreign). Mesoproiriaenes: rhabdome 2.3 3.3 mm. 



