236 GEODIA IIILGENDORFI. 



Geodia cooksoni (Sollas). 



Lendenfeld, Ticrreieh, 1903, 19, p. 11.). 



Cydonium cooksoni SoLL.\s, Rcpt. voy. "Cliallt'iiKcr," 1S>S!S, 25, p. 255. 



The following description is based on an examination of part of tlie type 

 specimen in the British Museum. 



Probably lobose. Inspirit: light brown. 



Choanosomal amphioxes: 1.2-2 mm., mostly 1.7-1.9 mm. by 18-36, mostly 

 25-32 fi (Sollas, 1888, 41 /i). Minute dermal rhabds: mostly ami>hiox, rarely 

 with one or both ends blunt; 150-190 /x (Solhus, 1888, 129 fi) by 2-5 fi. Ortho- 

 plagiotriocncs: rhabdome 1.2-1.9 mm. by 40-60 fi (Sollas, 1888, 64.5 /x); clades 

 concave to the rhabdome throughout their length, 200-340 fi long; clade-angles 

 88-104°, on an average 97°. Mesoproclades (Sollas, 1888, protriaenes): rhabd- 

 ^ome 1.6-2 mm. (Sollas, 1888, 2.38 mm.) by 7-13 /« (Sollas, 1888, error, 75 fi) 

 at cladome and 10-18 /x in the middle; rarely three fully developed clades, usually 

 one, two, or all three reduced or absent altogether, fully developed clades 27- 

 45 /( long; clade-angles 34-64°, on an average 44°; epirhabd 30-70 fi long. 



Lai-ge choanosomal oxyasters, with from two to thirteen usually strongly 

 spincd, straight, conical rays, 1.6-2.3 /i thick at the base; centrum small or ab- 

 sent; total diameter 22-42 fi (not mentioned by Sollas, 1888). Sollas, 1888, 

 describes chiasters 19.7 fi in diameter with slender, cylindrical, truncate rays, 

 which were not observed by me. Oxysphaerasters: with from eleven to thirty 

 conical, distally sparsely spined rays, 0.5-1.6 fi thick at the base; centrum 

 1.3-3 pL, whole aster 12-18 fi (Sollas, 1888, up to 19 fi) in diameter. Strongylo- 

 sphaerasters: with from ten to thirty cylindrical or cylindroconical, truncate rays, 

 0.5-1.1 n thick; centrum 1.5-2.5 /(, whole aster 4-6.5 fi (Sollas, 1888, 1-6 fi), in 

 diameter. Sterrasters: flattened ellipsoids, 75-80 /x by 70-75 fi by 57-60 fx 

 (Sollas, 1888, 77.4 by 66 p). 



Eastern Pacific. Galapagos ; Charles Island. 



Geodia hilgendorfl Thiele. 

 Zoologica, 1S9S, 24, p. 8, plate 1, fig. 4, plate G, fig. 4a-k. Lkndenfeld, Ticrreicli, 190:!, 19, p. 1 12. 



Massive elongate, with broad and low lobose protuberances. Dry; whitish. 



Large amphioxes: 1.2-1.6 mm. long. Minute dermal amphioxes: blunt, 

 140-180 /£ long. Orthoplagiotriaenes: rhabdome 1.6-1.7 mm. long sometimes 

 reduced and rounded; clades 250-300 /i long; cladome sometimes very irregular. 

 Mesoprotriaenes: rhabdome 1.2-1.0 mm. long; clades as long as or longer than 

 the epirhabd. Anatriaenes. 



