GEODIA BREVIANA. 243 



whole aster 6-11 ji, in diameter. Sterrasters: 87-107, usually not over 97, by 

 77-92, usually not more than 86, by 58-69 ft. 



Northeastern Pacific. West coast of North America ; near Santa Barbara 

 Islands. "Albatross" Station 4417. 



Geodia breviana Lendenfeld. 



Ante, p. 155. 



Cydonium mulleri Lambe (non Fleming), Trans. Roy. soc. Canada, 1893, 10, p. 72, plate 4, fig. 1, plate 6, 

 fig. 1-la-i. 



The following description is also based on an examination of the type 

 specimen of Cydonium mulleri Lambe, 1893, in the collection of the Geological 

 Survey of Canada. 



Cup shaped with small cavity. Inspirit: dirty white; dry: brown. 



Large choanosomal amphioxes: 1.8-5 mm. by 30-88 /< (Lambe, 1893, 2.77- 

 3.81 mm. by 80 jjl). Minute dermal ainphioxes : 280-450 by 2-8.5 fi (Lambe, 1893, 

 288 by 13 /O- Plagioorthotriaenes: rhabdome 1.8-4.1 mm. (Lambe, 1893, 2.4 

 mm.) by 60-130 /i; clades 280-680 n (Lambe 1893, 700 /t) long; clade-angles 

 94-113°. Mesoprotriaenes: rhabdome 7-11 mm. (Lambe, 1893, 7.84 mm.) 

 by 15-32 fi; clades 65-250 ft (Lambe, 1893, 95 /.i) long; clade-angles 20-44°. 

 Large anaclades: mostly triaene, rarely diaene; rhabdome 9-11 mm. (Lambe, 

 1893, 7.5 mm.) by 25-40 /z; clades 47-115 ju (Lambe, 1893, 60 /t) long; clade- 

 angles 45-65°. Minute dermal anaclades: generally without, sometimes with 

 epirhabd (mesanaclades) rhabdome 350-610 [i by 1-4.5 fi at the cladome, and 5- 

 8.6 n at the thickest point below the middle; clades 2-12 ft long; clade-angles 

 42-60°; epirhabd of the mesanaclades 5-8 n long (not mentioned by Lambe, 

 1893). 



Large thick-rayed oxyasters: from five to twelve usually simple, rarely bi- 

 furcate, conical, pointed or blunt, distally spined rays, 1-2.3 n thick; centrum 

 small; total diameter 16-26.5 /i (Lambe, 1893, apparently considers all the eu- 

 asterfonns as oxyasters and gives 3-13 /i as their total diameter). Large thin- 

 rayed oxyasters: rare, not always present, perhaps foreign; nine to fourteen 

 distally spined rays, 0.25-0.7 /« thick; no centrum; total diameter 7-23 /(. 

 Large oxysphae^-asters : up to thirty rays with large spines, 1-2.7 ft thick; cen- 

 trum 3-9 fi, whole aster 12-21.5 fi, in diameter. Small strongylosphaerasters: 

 from thirteen to twenty-five distally spined rays, centrum 2-5.5 fi, whole aster 

 6-12 fx, in diameter. Sterrasters: 84-105 by 75-98 by 55-77 fi (Lambe, 1893, 

 91 fi). 



