GEODIA AGASSIZII. 



241 



Northeastern Pacific. West coast of North America; 33° 38' 45" N. 

 "Albatross" Station 2942. 



Geodia agassizii Lendenfeld. 

 Ante, p. 113. 



Cydonium mulleri Lambe (non Fleming), Trans. Roy. soc. Canada, 1893, 11, p. 36, plate 4, fig. 2. 



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

 men of Cydonium milUeri Lambe 1893, in the collection of the Geological Surve}^ 

 of Canada. 



Massive, spherical, oval, elongate or somewhat irregular; without praeos- 

 cular cavities. In spirit : uniformly white to light brown, some with dark brown 

 patches, some dark blue. 



Large amphioxes: of adult 2.3-4.8 mm. by 60-112 pt; of immature 1.8- 

 3.4 by 20-66 /x. Large amphistrongyles: only in the immature, a little shorter 

 than the amphioxes, 55 /< thick. Large, slender styles: rather rare, not in all 

 specimens; of adult 1.5-3.4 mm. by 60-110 Large, stout styles: rare, only 

 in some specimens; of adult at thickened rounded end 115-145 fi thick. M inute 

 dermal amphioxes: of adult 160-480 by 5-12 /<; of immature 180-480 by 3-8 

 Ortlioplagiotriaenes of adult: rhabdome 1.5-4.3 mm. by 65-150 /<; clades 240- 

 560 IX long, simple, more rarely with irregular branchlets; clade-angles 73-117°; 

 of immature: rhabdome 2-3.5 mm. by 50-100 p.; clades 300-500 p. long; clade- 

 angles 88-108°. Regidar dichotriaenes : only in the smallest immature specimen, 

 rhabdome 1-2.2 mm. by 50-75 p; main clades 150-300, end clades 30-130 p 

 long; angles of main clades 109-112°; cladome 350-700 p broad. Mesortho- 

 triaenes: rare, not in all specimens; in the adult, a style-like shaft 1.8-3 mm. 

 by 78-164 p at the rounded end, with clades 78-300 p long, inserted near the 

 rounded end and concave towards it. hregidar amphiclade orthoplagiotriaene, 

 derivates: rare, not in all specimens, dimensions as in the orthoplagiotriaenes, 

 but with a branch-ray on the rhabdome, besides the ordinary clades. Mesopro- 

 triaenes of adult: rhabdome 2-6 mm. by 7-40 p\ clades 60-250 p, epirhabd 

 25-320 p long; clade-epirhabd angles 22-55°; of immature: rhabdome 9-20 p. 

 thick; clades 60-125 //, epirhabd 70-100 p long; clade-epirhabd angles 36-47° 

 Large anatriaenes of adult: rhabdome 4-9 mm. by 10-50 p; clades 40-155 p 

 long, clade-angles 32-65°; of immature: rhabdome 3.3-4.7 mm. by 18-28 p; 

 clades 45-110 p long, clade-angles 31-52°. hregular anatriaene-derivates: 

 rare, not in all specimens; dimensions as in the regular anatriaenes. Minute 

 dermal anaclades: rare, observed only in the smallest immature specimen; 



