6d Canadian Arctic Expedition, 1913-18 



EXPLANATION OF PLATE. 



Fig. 1. Phascolosoma hudsonianum, n. sp. side view, distal end of proboscis retracted. 



Fig. 2. Phascolosoma hudsonianum, n. sp., dissection, dorsal view. a. anus; oe. oesophagus; 

 di. descending coils of intestine; ai. ascending coils of intestine; sm. spiral muscle; 

 dr, dorsal retractors; vr, ventral retractors; g, reproductive festoons; n, nephridia; 

 nc, nerve cord. 



Fig. 3. Phascolosoma hudsonianum, n. sp., portion of skin about two centimeters from caudal 

 end. 



Fig. 4. Phascolosoma hudsonianum, n. sp., portion of skin from caudal surface. 



