GEODIA MESOTRIAENA. 



239 



Geodia hirsuta (Sollas). 

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



Cjdonium hirsutus Sollas, Proc. Roy. Dublin soc, 1886, 5, p. 197. Rept. voy. "Challenger," 1888, 

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



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



Amphioxes: shorter and stouter, 4.462 mm. by 60 /Jt, and longer and more 

 slender, 9 mm. by 31.6 /«. Tylostyles: with large spherical tyle. Dichotriaenes: 

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

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

 rhabdome at cladome 20 /i, at thickest point 29 fx thick; clades 127 /i long; 

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

 thick; clades 36 /t long. 



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

 Cortical oxysphaerasters: rays spined; centrum 12 ji, whole aster 32 //, in diam- 

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

 161 n, outline oval or somewhat hexagonal. 



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



Geodia mesotriaena Lendenfeld. 

 Ante, 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 amphioxes: 4.3-8.2 mm. by 50-105 /i. Large styles: rare; 

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

 Orthoplagiotriaenes: rhabdome 4.6-7.2 mm. by 85-120 fx; clades 200-670 fx 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 fi at the cladome, and 38-70 fi at the thickest point near the 

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

 Ancdriaenes: rhabdome 11-16 mm. by 8-40 fx; clades 70-270 fx 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 fx thick ; total diameter 19-54 fx. Small 

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

 Large oxysphaer asters : from fifteen to twenty-five very spiny rays, 1-3 fx thick ; 



