GEODIA MICROPORA. 245 



Geodia sphaeroides (Kieschnick). 



Thielk, Abhandl. Senckenb. gesellsch., 1900, 26, p. 41, plate 2, fig. 14a-k. Lendenfeld, Tierreich, 



1903, 19, p. 110. 

 Cyilonium sphaeroides Kieschnick, Zool. anz., 1896, 19, p. 529. 

 Geodia arripiens Lindgren, Zool. anz., 1897, 20, p. 486. Zool. jahrb. Syst., 1898, 11, p. 346, plate 18, 



figs. 10, 18, plate 20, fig. .5a-i, a', h', c', i'. 



Spherical or ellipsoidal. Surface brown, interior yellowish or grayish. 



Large amphioxes: 1.5-2.4 mm. by 30-40 /t. Small dei-mal amphioxes: 230 

 by 5 /«. Dichoiriaenes: rhabdome 2.35-3 mm. by 60-70 ju, sometimes reduced 

 in length and rounded; main clades 120-220, end clades 150-180 julong; main 

 clade-angles 120°. Large onatriaenes: rhabdome 3.3-3.5 mm. by 18-20 /t; 

 clades 50-60 jli long; divergent; cladome 80 /« broad and 48 fi high. Minute 

 anatriaenes: dermal or subcortical; rhabdome 340-360 by 2-3 /i; clades 8 fi 

 long ; cladome 10 /^ broad and 6 fi high. Protriaenes (? mesoprotriaenes) : rhabd- 

 ome 2.5-3 mm. by 16-20 /i; clades 60-80 /i long, sometimes one or two reduced; 

 cladome 80 ft broad and 68 ft high. 



Oxysphaerasters: rays numerous, spined; centrum 6-15 fi, whole aster 36- 

 50 /i, in diameter. Small strongylasters (strongjiosphaerasters) : total diameter 

 8-15 n; the dermal smaller than the choanosomal. Sterrasters : sphaeroidal; 

 35-88 by 72-80 //. 



Western Pacific. Ternate: Coast of Cochin China; 11° 5' N., 108° 50' E. 



Geodia micropora Lendenfeld. 

 Ante, p. 170. 



Lobose. In spirit: brownish white. 



Large choanosomal ainphioxes: mostly simple, occasionally centrotyle; 

 1.2-1.6 mm. by 20-28 fi; tyle of centrotyles 12-30 % more than adjacent 

 parts of the spicule in diameter. Minute dermal amphioslrongyles: attenuated 

 towards both ends; 125-165 by 2-3.6 /i. Orthoplagiotriaenes: rhabdome 1.1- 

 1.45 mm. by 28-47 fi; clades blunt, concave to the rhabdome throughout or 

 only basally and straight distally; 175-230 //long; clade-angles 97-112°. Meso- 

 procladcs: rhabdome about 1.7 mm. by 4-9 /i at the cladome, and about 20 % 

 more at the thickest point near the middle; clades very variable, often one or 

 two suppressed, 10-30 fi long; clade-angles 32-64°; epirhabd conical, 25-43 fi 

 long or reduced to a knob. 



Large oxyasters: from six to nine conical rays, 0.6-0.7 /t thick, and spined 

 everywhere, except quite at the base; no centrum; total diameter 14-20 /x. 



