142 G ' Canadian Arctic Expedition, 1913-1918 



PLATE XX. 



Fig. 1. Bicidiopsis tubicola Verrill. New species. Type. Side view from life. About 

 natural size. By J. H. Emerton. 



2. Siph&nactinia parasitica (L. Ag.). Anterior part. From a large living specimen. 



Conchula is nearly retracted; x 2. 



3. The same. View from life of the disk and tentacles, with the mouth distended; con- 



chula is but little protruded; x about 3. 



4. Tealiopsis stella Verrill. Side view of an alcoholic specimen from Hudson bay; x \\. 



5. The same. One of the cotypes, contracted and covered with adherent sand, etc. ; natural 



size. 



6. The same. Type. From a living expanded specimen: f natural size. After E. S. 



Morse. 



7. The same. Part of a longitudinal section, showing the sphincter muscle (s); t, ten- 



tacles; v, verrucse; u, mesogloea of body wall; f, foramen in a perfect mesentery ; r, 

 an imperfect mesentery. Enlarged. 



8. The same; (a) an egg, x2; (b) larva, nat. size; taken from a Hudson bay specimen^ 



(c) one of the extruded young, contracted; x about 3. 



9. The same. One of the young, soon after birth, from life; x about 4. 



10 and 11. The same. Two of the young taken from inside of an alcoholic specimen from 

 Hudson bay; x 4. 



12. The same. Disk and tentacles; 1-4, are tentacles of first to fourth cycles; 1, d, d, two 



directive tentacles; about f natural size. All by the author. 



13. Urticina crassicornis (Mull.) Ehr., Disk and tentacles of a large living decamerous- 



specimen, about f natural size. Copied from a photograph by A. H. Verrill. 



