1,58 G Canndian Arctic Expedition, 1913-1918 



Plate XXVIII. 



Fig. 1. Slephaitauge nrxilis Venill. Cotype. Longitudinal section, from a photograph; 

 X about 2. 



2. The same. Another specimen. Transverse section across the upper part, cutting the 



inner part of the retracted disk and invected tentacles. 



3. The same specimen. A section made a little lower do-mi. 



4. The same specimen. A section made still lower down, x 2. By the author. 



