CTENOPHORES OF THE ATLANTIC COAST OF NORTH AMERICA 
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Fic. 4.—Pleurobrachia pileus, from life by the author. 
Halifax, Nova Scotia, September 27, rgro. 
A, side view; B, looking down on oral pole. ad,adradial canals; ex,excretory pores; 
f, funnel or infundibulum; ft, axial funnel tube; g, paragastric canals; 7, inter- 
radial canals; m, mouth; #, pole-plate; pr, perradial canals; sto, stomodeum; 
i, tentacular canals; ten, tentacles; ts, tentacle-sheaths. One tentacle is shown 
in partial contraction, the other extended. 
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