PLATE XXVn. 



Unless othei'wise stated, the figures in this and the following plates 

 are of natural size. 



Streptelasma rectum (page 199). 



I'igure ]. Side view of a specimen from the Mackenzie River. 



Figure Ik. Outline of the anterior end of the same as seen from above. 



Figure 2. Longitudinal section of another specimen from tlie same locality. 



(Jyathothyllum Ktchardsoni (page 200). 



Figure n. Side view of one of the specimens collected b)' Mr. McConnell. 

 Figure 4. Longitudinal section of anotlier specimen. 



Campophyllum elliptioum (i>age 202) . 



Figure 5- Side view of a specimen from the Hay River. 

 Figure 6. Longitudinal section of a large but imperfect specimen from the 

 same locality. 



Cyathophyllum ciESPiTosuM (page 200). 



Figure 7. Side view of a simple, or nearly simple, specimen from the Hay 

 River. On the other side of this specimen, however, there is a 

 single lateral bud. 



Figure 8. Longitudinal section of another specimen from this locality. 



Heliophyllum PARVULUM (page 203). 



Figure 9. Side view of one of the types of this species, from the Hay River. 



Figure 9((. Longitudinal section of the same. 



F'igure 10. Side view of another specimen from the Hay river. 



