GEODIA MESOTRIAENA. 239 



Geodia hirsuta (Sollas). 



Lendenfeld, Tierreich, 1903, 19, p. 106. 



CyUonivm hirmtus Sollas, Proc. Roy. Dublin soc, 1S86, 5, p. 197. Rept. voy. "Challenger," 1888, 

 25, p. 218, plate 21, figs. 30-42. 



Irregular, lobose with digitate processes. In spirit : grayish white. 



Amphtoxes: shorter and stouter, 4.462 mm. by 60 /<, and longer and more 

 slender, 9 mm. l)y31.6/(. Tylostyles: with large spherical tyle. Dkhotriaenes: 

 rhabdome over 4.46 mm. long, 84 ^ thick, attenuated at first very rapidly; 

 main chides 127 fi, end clades 350 fi long. Protriaenes (? mesoprotriaenes) 

 rhal)dome at cladome 20 /(, at thickest point 29 /< thick; clades 127 ;t long; 

 cladome 143 /t broad and 99 /< high. Anatriaenes: rhabdome long, 18 /( 

 thick; clades 36 /( long. 



Choanosomal oxyasters: rays pointed or truncate; total chameter 19.7 /x. 

 Cortical oxysphoerasters: rays spined; centrum 12 /«, whole aster 32 fi, in diam- 

 eter. Strongylosphaerasters: total diameter 11.8 ^. Sterrasters: 306 by 245 by 

 161 /(, outline oval or somewhat hexagonal. 



Central Pacific. Ki Islands ; 5° 49' 15" S., 132° 14' 15" W. 



Geodia mesotriaena Lendenfeld. 

 .\ntp, p. 96. 



Massive, cake shaped, horizontally expanded, large, up to 23 cm. in maxi- 

 mum diameter, with praeoscular cavities, scarce in the smaller, numerous in 

 the larger specimens. Dry and in spirit: yellow to brown. 



Large choanosomal amphtoxes: 4.3-8.2 mm. by 50-105 fx. Largeslyles: rare; 

 3-4 mm. by 70-110 /(. Minute dermal amphioxes and styles: 380-680 by 9-19 p.. 

 Orthoplagiotriaenes: rhabdome 4.6-7.2 mm. by 85-120 /<; clades 200-670 /i long, 

 concave to the rhabdome proximally, straight or slightly curved in the opposite 

 direction distally; clade-angles 85-117°. Mesoprotriaenes: rhabdome 6-14 

 mm. by 15-40 /( at the cladome, and 38-70 pi at the thickest point near the 

 middle; clades 90-310 /« long; clade-angles 29-56°; epirhabd 95-330 /( long. 

 Anatriaenes: rhabdome 11-16 mm. by 8-40 /«; clades 70-270 /t long, clade- 

 angles 34-58°. Mesanaclade anatriaene-derivates: rare; dimensions as in the 

 regular anatriaenes. 



Large oxyasters : from five to fifteen rays, conical throughout or nearly cylin- 

 drical at the base, distally spined, 1-4 p. thick; total diameter 19-54 /.i. Small 

 oxyasters: from eight to twenty rays 0.9-3 n thick; total diameter 11-20 fi. 

 Large oxysphaeraslers: from fifteen to twenty-five very spiny rays, 1-3 p. thick; 



