SIDONOPS ANGUI.ATA VAR. MICROANA. 



225 



Sidonops angulata Lendenfeld. 

 Ante, p. 24. 



Massive, irregularly spherical or lobose. In spirit: yellowish 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 /i. Styles and style-derivates: rare; 2.1-2.5 mm. by 60- 

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

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

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

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

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

 ome up to more than 9 mm. in length and 7-39 fx thick; clades 30-210 /j. 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 /xm diameter; total diam- 

 eter 11-64 /<; size on the whole in inverse proportion to the ray-number. 

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

 truncate, distally spined rays, 2-6 p. thick; centrum 7-14 /«, whole aster 16-28 

 fx in diameter. Sterrasters: 85-122 by 75-113 by 57-86 /<. 



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

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



Sidonops angulata var. megana Lendenfeld. 

 Ante, p. 24. 



Stout choanosomal amphioxes up to 72 fi thick. Slender dermal amphioxes, 

 not numerous, up to 34 /x thick. Anaclades, triaene, rhabdome up to 39 /< thick, 

 clades up to 210 fi long. Strongylosphaerasters with nearly cylindrical rays. 

 Sterrasters up to 122 /« long, all ellipsoidal. 



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

 "Albatross" Station 2975. 



Sidonops angulata v.ir. microana Lendenfeld. 

 Ante, p. 24. 



Stout choanosomal amphioxes up to 52 p. thick. Slender dermal amphioxes, 

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

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

 conical rays. Sterraster^s up to 97 /< long, all ellipsoidal. 



