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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 57 



Alimentary canal. — This canal is large and may be traced from the 

 last abdominal segment through and into the head as shown in 

 figure 9. 



Dimensions. mm. 



Length of body 40 



Caudal spine 30 



Head g 



Thorax 26 



Abdomen 4 



Fig. 8. — Emeraldella brocki, n. sp. Dorsal view of a flattened specimen. 

 X i-Si showing antennules, antennae, 3 posterior cephahc appendages, epistoma, 

 and position of mouth. 



Observations.- — The specific name is given in honor of R. W. 

 Brock, Director of the Geological Survey of Canada, who has been 



