156 G Canadian Arctic Expedition, 1913-1918 



PLATE XXVII. 



Fig. 1. Actinauge rugosa Verrill. New species. Longitudinal section. Enlarged, cp, infolded 

 capitulum: a, a, tentacles: e, sphincter muscle; d, f, verrucse or tubercles; o, 

 stomodseum; p, wall of stomodseum; n, its external layer; m, s, 1-4, perfect 

 mesenteries of 1 to 4 pairs; r, a pair of primary perfect mesenteries; g, ectoderm 

 of body wall; i, endoderm; n, mesoglcea; c, circular muscles of body-wall; 1, 1, 

 gonads and mesenterial filaments; b, sufrace of base; t, section of base* x about 2. 

 2. Actinauge verrillii McMurrich. Longitudinal section of a rather small specimen, 

 enclosing a ball of mud (s) in the bulbous base. Lettering as in Fig. 1, with the 

 addition of b, tentacle lobe; m, mouth lobes; k, section of disk; v, opening of 

 the bulbous base; x about 1. Drawings by A. H. Verrill. 



