GEODIA AGASSIZII. 

 DIMENSIONS OF ANATRIAENES OF GEODIA AGASSIZII. 



129 



The anadiaenes (Plate 28, fig. 28; Plate 32, fig. 44) are rare. They have 

 been found only in the adult specimens from Station 3168 and the young speci- 

 men from Station 4228, where also anatriaenes with clades of different length 

 are more frequent than in the specimens from the other stations. In shape and 

 size they perfectly resemble those anatriaenes, and I consider them as such 

 anatriaenes, in which the inequality of the clades is carried to the extent of the 

 complete suppression of one of them. 



The irregular anatriaene-derivates differ from the ordinary anatriaenes by 

 one of the three clades being directed upwards. These anatriaene-derivates are 

 rare. I have observed them only in the specimens from Station 4228. 



The large choanosomal oxyasters (Plate 27, figs. 3b, 6-14b; Plate 30, figs, lb, 

 2b, 4, 5, 10b; Plate 32, figs. 4, 6, 7) of the adult specimens have from four to 

 sixteen rays and a small centrum the diameter of which is usually from two to 



