244 



GEODIA OVIS. 



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

 fornia. "Albatross" Station 2894: Vancouver Island, Strait of Georgia, near 

 Comox. 



Geodia ovis Lendenfeld. 

 Ante, p. 161. 



Cake shaped, horizontally extended. With exceedingly high spicule-fur. 

 In spirit : light brown. 



Large choanosomal amphioxes: 4-9 mm. by 30-40 /z. Large styles and 

 tylostyles: of two kinds, stout and slender; the stout; mostly style; 2.6-4 mm. by 



85- 116 /<; the slender: always tylostyle; long; about 40 /i thick; tyle 60-65 // 

 in diameter. Minute dermal rhahds: mostly amphiox, rarely style; 270-550 

 by 8-13 [1. OrtJiotriaenes (and plagiotriaenes) : rhabdome 5-8 mm. by 74-100 fi 

 at the cladome, 77 110 a little farther down; clades concave to rhabdome 

 throughout or only basally, and straight distally, 310-640 /( long; clade-angles 



86- 101°. hregidar megascleres: rare. Mesoproclades and proclades: rhabdome 

 6-17 mm. by 20 41 at the cladome, near the middle from two to three times as 

 thick; in the normally developed mesoprotriaenes the clades 140-170 fi long, the 

 clade-angles about 45°, the epirhabd 110 fx long; in the irregular mesoproclades 

 (proclades) clades very unequal, the longest up to 260 n long, sometimes one or 

 two clades or the epirhabd suppressed. Aiiaclades: nearly all triaene; very 

 unequal in size; small and large ones distinguishable; the small: rhabdome 

 670 /(-2.5 mm. by 2-7 n; clades 6-43 long; clade-angles 41-65°; the lai^ge: 

 rhabdome up to 23 mm. long by 17-45 fi; clades 70-205 n long; clade-angles 

 36-55°. 



Lai^ge thin-rayed oxyasters: from three to ten conical, distally spined rays, 

 1-3.2 /I thick; no centrum; total diameter 20-34.5 /(. Large thick-rayed oxy- 

 asters: from four to nineteen conical, simple or partly bifurcate rays with large 

 spines in their middle parts, 3-6.3 /< thick; total diameter 28-45 /<; the many- 

 rayed appear sphaerastrose. Small thick-rayed asters: from six to fifteen trun- 

 cate or blunt-pointed, distally spined rays, 1-3.2 p. thick; centrum absent or 

 present and then up to 6 /f in diameter; whole aster 11-24 fx in diameter. Sterr- 

 asters: 82-92 by 70-83 by 54-61 //. Sterroids: rare; of similar dimensions, but 

 with much thicker rays. 



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

 batross" Station 2975. 



