CTENOPHORES OF THE ATLANTIC COAST OF NORTH AMERICA 11 



Fig. 4. — Pleurobrackia pileus, from life by the author. 

 Halifax, Nova Scotia, September 27, 1910. 



A, side view; B, looking down on oral pole, ad, adradial canals; ex, excretory pores; 

 /, funnel or infundibulum; //, axial funnel tube; g, paragastric canals; i, inter- 

 radial canals; m, mouth; p, pole-plate; pr, pcrradial canals; sto, stomodaeum; 

 /, tentacular canals; /en, tentacles; /5, tentacle-sheaths. One tentacle is shown 

 in partial contraction, the other extended. 



