20h Canadian Arctic Expedition, 1913-18. 



EXPLANATION OF PLATES. 



All figures drawn from photographs by E. N. Fischer. 



Plate I. 



Fig. 1. SarsiaJprinceps Haeokel. Side view of specimen 18 mm. high. It has swallowed a 

 Schizopod. 



Fig. 2. Halitholus cirraius Hartlaub. Side view of specimen 13 mm. high. 



Fig. 3. Halitholus cirraius Hartlaub. Side view of specimen 14 mm. high with bell cavity 

 opened, and upper wall turned back, to show manubrium and gonads. 



Fig. 4. Eumedusa similis, gen. et sp. nov. Side view of type specimen, with half the bell wall 

 cut away, to show manubrium and gonads. Four radial canals are intact, and the 

 base of a fifth. 



Fig. 5. Eumedusa similis, gen. et sp. nov. Apical view of contracted specimen (p. 8H.) to 

 show the S radial canals. 



