GFX)DIA JAPONICA. 235 



70 i-i, epirhabd 30-40 /i long. Anaclades: mostly triaene, rarely diaene or mon- 

 aene; rhabdome 4-4.5 mm. long, clades 50 /« long. 



Large oxijasters: rays few, 40-70 fi long. Small oxijasters: rays more 

 numerous, 15-20 /x long. Oxysphaerasters: rays stout and short; total diameter 

 12 /i. Small strongylosphaerasters: regular or irregular (ataxastrose) ; total 

 diameter 5 p.. Stermsters: 130 by 113 p. 



Northwestern Pacific. Japan ; Enoshima. 



Geodia japonica (Sollas). 



Thiele, Zoologica, 189S, 24, p. 7, plate 2, fig. 1, plate 6, fig. .3. Lendenfisld, Tierreick, 19;)3, 19, p. ill ; 



Ante, p. 72. 

 Cydonium japonicum Soll.vs, Hept. voy. "Challenger," ISSS, 25, p. 256. 



The following description is also based on an examination of part of the 

 type specimen in the British Museum. 



Cup shaped, outside lobose, large, up to nearly 50 cm. high. Dry : white. 



Stout choanosomal am,phioxes: 2-3.3 mm. by 30-51 p. Large styles: 2.1- 

 2.8 mm. by 40-43 p in the middle and 10-31 p at the rounded end. Slender 

 amphioxes: 1-2.2 mm. by 12-22 p. Minute dermal rhabds: mostly amphiox, 

 rarely style; 195-280 by 3.5-7 p; often irregularly curved. Orthoplagio- 

 triaenes: rhabdome 2.3-3.2 mm. by 50-85 p; clades 180-380 p long, distal part 

 straight; clade-angles 90-102°. Mesopi'oclades: rhabdome 2.8-4.3 mm. by 11- 

 21 p; clades 65-125 p long; clade-angles 22-48°; epirhabd 40-105 p long (not 

 mentioned by Sollas, 1888, and Thiele, 1898). Large anaclades: mostly triaene, 

 rarely monaene; rhabdome 2.4-5 mm. by 8-23 /«; clades 70-130 ;t long; clade- 

 angles 23-45°. Minute dermal anaclades: triaene, diaene, or monaene ; rhabd- 

 ome 235-310 by 1-2 p&i the cladome, and 2.8-5 p in the middle; clades 3-10 

 p long; clade-angles 30-54° (not mentioned by Sollas, 1888, and Thiele, 1898). 



Large oxyasters: from three to seven straight, conical, blunt, spined rays, 

 1.2-2.8 /( thick; total diameter 21-46 p (Thiele, 1898, gives the ray-length as 

 6-14 /«). Oxysphaerasters: from fifteen to twenty-one straight, conical, pointed, 

 spined rays 1.4-2 p thick; centiaim 5-7.5 p, whole aster 15-22 p in diameter. 

 Small strongylosphaerasters: mostly regular, rarely irregular (ataxastrose); 

 from six to twenty-two truncate or terminally rounded, spined rays, 0.5-1.3 p 

 thick ; centrum 1.2-5 p in diameter; the regular forms 4-6 p, the ataxastrose ones 

 5.8-7.3 p in total diameter. Sterrasters: 80-92 by 65-80 by 55-61 p (Thiele, 

 1898, 75 by 65 /()• 



Northwestern Pacific. Japan ; (Thiele's specimen, near Enoshima). 



