186 GEODIA LOPHOTRIAENA. 



by Thiele ^ as G. sphaeroides seem to be allied to them. These sponges I consider^ 

 one species, Geodia sphaeroides. 



The chief characters of Geodia sphaeroides and G. lophotriaena are tabulated 

 below. 





Geodia sphaeroides 



Geodia lophotriaena 



Shape 



small, massive, oval or spherical; 

 in one case at least with praeoscu- 

 lar cavity. 



small, incru.sting, cushion shaped; 

 without praeoscular cavity. 



Cortex 



720-900 /( thick. 



90-190 /( thick. 



Large choanosomal am- 

 phioxes 



2.2 or 2. 4 mm. by 36 or 40 /(. 



up to 1.8 nun. by 42 ii and 2 mm. 

 by 10 /(. 



Minute dermal ainphi- 

 oxes 



230 by 5 /i. 



up to 200 by 6 /<. 



Plagiotriaenes 



not mentioned. 



always pre.sent, in some specimens 

 more numerous than the dichotri- 

 aenes; rhabdome up to 1.2 mm. 

 by 35 ju; clades up to 195 /i. 



Dichotriaeiies 

 (lophotriaenes) 



rhabdome 2.35 or 3 mm. by 60 or 

 70 n; main clades 120 or 220; 

 always two end clades 150 or 180 /(. 



rhabdome up to 1.2 mm. by 59 /<; 

 main clades up to 140 /x; two or 

 more end clades up to 180 /t. 



Proclades 



protriaenes; rhabdome 2.5 or 3 

 mm. by 16 or 20 /i; clades stout, 

 frequently irregular, 70 or 80 /(. 



mcsoprotriaenes; rhabdome 1.3 

 mm. by up to 9 (11) /<; clades 

 slender, regular, up to 30 /t; epi- 

 rhabd up to 60 /(. 



Large aiiatriaenes 



rhabdome up to 3.3 or 3.5 mm. by 

 18 or 20 /t; clades stout, 50 or 00 /(. 



rhabdome up to 13 /^ thick; clades 

 slender, up to 85 /(. 



Small dermal or sub- 

 cortical anatriaenes 



rhabdome 310 or 360 by 2-3 /<; 

 clades 8 



rhabdome up to 210 by 3 (4) /t; 

 clades up to 9 ;i. 



Large oxyasters (oxy- 

 sphaerasters) 



36 or 50 /( in diameter; with large 

 centrum (6 or 15 /(); rays spined. 



15-41 /( in diameter; without cen- 

 trum or with small centrum, not 

 more than 4/! ;rays perfectly smooth. 



Small sphaerasters 

 (mostly strongylo- 

 sphaerasters) 



8-15 /! in diameter. 



7-22 n in diameter. 



Sterrasters 



85 or 88 n long. 



30-45 /«, exceptionally perhaps up 

 to 58 n long. 



Habitat 



Cochin China; Ternate. 



probably New Zealand. 



I,/. Thiele. Kieselschwamme von Ternate I. Abhandl. Senckenb. gescllsch., 1900, 25, p. 41, 

 plate 2, fig. 14. 



2 R. V. Lendenfeld. Tetraxonia. Tierreich, 1903, 19, p. 110. 



