SIDONOPS BICOLOR. 



227 



Sidonops reticulata (Bowerbank). 

 Lendenfeld, Tierreich, 1903, 19, p. 102. 



Geodia reticulata Bowerbank, Proc. Zool. soc. London, 1874, p. 300, plate 46, figs. 14-20. Soll\s, Rept. 

 voy. " Challenger," 1888, 25, p. 253. 



Massive. Dry: white. 



Amphioxes: 1.75 mm. by 19 /<. Orthoplagiotn'aenes: rhabdomc 2 mm. 

 by 31.2 /<; clades 237.5 long; cladome 450 /« broad. Protriaenes: (mesoi)ro- 

 triaenes ?): clades 250 /a long; cladome 120 /i broad and 206 /i high. Ana- 

 triaenes: clades 144 /t long; cladt)me 150 /i broad and 125 /.i high. 



Oxyasters: no centrum; total diameter 25.4 /(. Snudl strongylasleis: 

 total diameter 8.5 Steirasters: spherical, small. 



? Eastern Pacific. Mexico. 



Sidonops bicolor Lendenfeld. 

 Ante, p. 46. 



Irregularly tuberous, elongated or flattened. In s})irit: whitish to reddish 

 or purple-brown, some parts of the surface usually much darker than others. 



Stout amphioxes: rather blunt; 2.3-5.6 mm. by 36-105 /i. Stout styles: 

 rare, not in all specimens ; 4 mm. by 100-200 /<. Slender amphioxes: 3.5-9 mm. 

 by 15-40 [i. Plagiotriaenes: rhabdome usually 2.1-4 mm. by 82-110 /< at the 

 cladome, and 3-10 /< more a little below, at the thickest point; sometimes re- 

 duced in length, cylindrical and rounded; clades, concave to the rhabdome, 

 nearly straight, or concave to the rhabdome proximally and convex to it distally, 

 blunt, 280-700 /x long; clade-angles 103-122°. 



Large choanosomal oxyasters: from one to twelve, most frecjuently from 

 seven to nine, distally spined rays, 1-2.8 /< thick; centrum 2.8-6 /t, whole aster 

 19-34 fi, in diameter. Oxysphaerasters: from twelve to twenty-five distally 

 spined rays, 0.7-2.5 /« thick; centrum 4-10 /f, whole aster 10-23 /(, in diameter. 

 Strongylosphaer asters: usually from nine to thirty, very rarely only one, distally 

 spined rays, 0.7-3.5 p. thick; centrum 4-12 n, whole aster 9-21 //, in diameter. 

 Sterrasters: 130-170 by 100-133 by 77-97 p. 



Northeastern Pacific. West coast of North America; from 33° 18' N. to 

 Monterey Bay. "Albatross" Stations 2958, 2981, 3168, 4420, 4531, 4551. 



