GEODIA AGASSIZII. 

 DIMENSIONS OF MESOPROTRIAENES OF GEODIA AGASSIZII. 



The anatriaenes (Plate 28, figs. 16c, 18-27; Plate 32, figs. 43, 45, 46) occur 

 in all specimens. They appear to be particularly numerous in the specimens 

 from Station 2887. The rhabdomes of the anatriaenes of the adult specimens 

 are 4-9 mm. long and at the cladome 10-50 /i thick, their average maximum di- 

 mensions being 6.5 mm. X 32.56 fi. The rhabdomes of the anatriaenes of the 

 specimens from Station 4199 are considerably thicker than those of the others. 

 The rhabdome is straight or slightly curved and thicker in the middle than at 



