Canadian Arctic Expedition, 1913-18 



EXPLANATION OF PLATES. 



All figures were drawn with the aid of a camera lucida from hexatoxylin stained mounts 

 in damar, except figure 1, which was from an alcoholic specimen. Magnification is indicated 

 by a projected portion of a stage micrometer accompanying each drawing, values of these scales 

 are given in a footnote. 



Plate L* 



Filicollis arcticus, n. sp. 



Fig. 1. Female, showing general body form. It was from this individual that the proboscis was 

 later removed for study. 



2. Profile of proboscis of fully mature female. 



3. Surface view of a portion of the body wall from mature female, showing cuticular spines. 



4. Proboscis of same individual shown in fig. 1. 



5. An embryo from body cavity of gravid female. 



* The scale indicating magnification accompanying Fig. 1 has the value of 1 mm.; scales accompany- 

 ing all other figures of this place have the value of 0.1 mm. 



