SIDONOPS ANGULATA VAR. MICROANA. 225 



Sidonops angulata, Lendenfgld. 

 Ante, p. 24. 



Massive, irregularly spherical or lobose. In spirit: jTllowish in the interior 

 and white to reddish or purplish brown on the surface. 



Stout chaonosomal amphioxes: straight, slightly curved or angularly bent; 

 1.6-3.7 mm. by 20-72 /x. Styles and style-derivates: rare; 2.1-2.5 mm. b}^ 60- 

 110 /<; the derivates with a branch-ray. Slender dermal amphioxes: slightly 

 curved or angularly bent; 2.9-9.5 mm. by 5-34/«. Orthoplagiotriaenes: rhabd- 

 ome 1.5-2.8 by 47-82 /«, rarely shortened and thickened, up to 105 /< thick; 

 clades concave to the rhabdome, curvature increasing distally, 330-700 jn long, 

 clade-angles 89-112°. Anaclades: mostly triaene, sometimes diaene; rhabd- 

 ome up to more than 9 mm. in length and 7-39 /< thick; clades 30 210 /( long; 

 clade-angles 27-66°. 



Oxyasters and oxysphaerasters: one to twenty-three perfectly smooth, conic 

 rays 1.6-5^ thick; centrum, when present, up to 12 /tin diameter; total diam- 

 eter 11-64 /x; size on the whole in invei*se proportion to the raj'-numbei'. 

 Strongylosphaerasters: from ten to twenty, equal or, more rarely, unequal, 

 truncate, distally spined raj'S, 2-6 /i thick; centrum 7-14 /(, whole aster 16-28 

 /« in diameter. Sterrasters: 85-122 by 75-113 by 57-86 /t. 



Northeastern Pacific. West coast of North America; off southern Cali- 

 fornia. "Albatross" Stations 2945, 2975, 4417. 



Sidonops an^Iata var. megana Lendenfelo. 

 Ant<>, p. 24. 



Stout choanosomal amphioxes up to 72 /< thick. Slender dermal amphioxes, 

 not numerous, up to 34 /t thick. Aimclades, triaene, rhabdome up to 39 p. thick, 

 clades up to 210 /« long. Strongylosphaerasteis with nearly cylindrical rays. 

 Steirasters up to 122 ju long, all ellipsoidal. 



Northeastern Pacific. West coast of North America; 34° 1' 30" N. 

 "Albatross" Station 2975. 



Sidonops angulata v.ar. microana Lendenfeld. 

 Ante, p. 24. 



Stout choanosomal amphioxes up to 52 /< thick. Slender dermal amphioxes, 

 very abundant, up to 22 /< thick. Anaclades, triaene and, less frequently, diaene, 

 rhabdome up to 18 /< thick, clades up to 50 /< long. Strongylosphaerasters with 

 conical rays. Steirasters up to 97 /< long, all ellipsoidal. 



