GEODIA MICROPORA. 



245 



Geodia sphaeroides (Kieschnk k). 



Thiele, Abhandl. Senckenb. gesellsch., 1900, 25, p. 41, plate 2, fig. 14a-k. Lendenfiold, Ticrreifh, 



190.3, 19, p. 110. 

 Cydonium sphaeroides Kieschnick, ZooI. ,mz., 1896, 19, p. 529. 



Geodia arripiens Lindgren, Zool. anz., 1S97, 20, p. 4S6. Zool. jahrb. Syst., 1898, 11, p. .346, plate 18, 

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



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



Large amphioxes: 1.5-2.4 mm. by 30-40 /«. Small dermal amphioxes: 230 

 by 5 /f. DicJiotriaencs: rhabdome 2.35-3 mm. by 60-70 /t, sometimes reduced 

 in length and rounded; main clades 120-220, end clades 150-180 /«long; main 

 clade-angles 120°. Large anatriaenes: rhabdome 3.3-3.5 mm. l)y 18-20 /t; 

 clades 50-60 /< long; divergent; cladome 80 /( broad and 48 /< high. Minute 

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

 long; cladome 10 /(broad and 6 /thigh. P/-o/r("oe/?f>.s (? mesoprotriaenes) : rhabd- 

 ome 2.5-3 mm. l)y 16-20 ft; clades 60-80 /< long, sometimes one or two reduced; 

 cladome 80 /« broad and 68 // high. 



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

 50 /<, in diameter. Small strongylasters (strongylosphaerasters) : total diameter 

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

 35-88 by 72-80 /^i. 



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



Geodia micropora Lendenfeld. 

 Ante, p. 170. 



Lobosc. In spirit: brownish white. 



Large ehoanosomal amphioxes: mostly sim]:)le, occasionally centrotyle; 

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

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

 towards both ends; 125-165 by 2-3.6 /<. Orthopia g iotr iaenes : rhabdome 1.1- 

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

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

 proclades: rhabdome about 1.7 mm. by 4-9 p. at the cladome, and about 20 % 

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

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

 long or reduced to a knob. 



Large oxyastcrs: from six to nine conical rays, 0.6-0.7 ft thick, and spined 

 everywhere, except cjuitc at the base; no centrum; total diameter 14-20 /(, 



