i: 



7 < 



Explanation of Plate. 



(The pointed end of the arrows on the plate indicates the anterior ends of the carapace.) 



Fig. 1. Cyclus communis Rogers. 



1. Dorsal view of carapace. X 6. 



la. Profile view of carapace ( diagrammatic), showing position of facetted 

 eye and slight groove separating margin from carapace proper. X 7- 

 Fig. 2. Cyclus packardi Rogers. 



2. Dorsal view of carapace. X 3. 



2a. Dorsal view of portion of carapace of another specimen, showing 

 surface detail ; the broken parts of the carapace overlap. X 6. 

 Fig. 3. Cyclus permarginatus Rogers. 



3. Dorsal view of carapace. X 6. 

 Fig. 4. Cyclus limbatus Rogers. 



4. Dorsal view of carapace. X 7. 

 Fig. 5. Cyclus minutus Rogers. 



5. Dorsal view of carapace. • 7. 



