PLATE VII. 



C. signatus, coronatus. 



Leitz camera drawings. Reduced one half. 



FIG. I. An outline showing the proportions of the thorax, abdomen, and antennae 

 when there are but ten segments in the antennae. 3X3- 



The abdomen has but three undifferentiated segments, to the last of which are 

 attached the characteristic caudal stylets. 



The antennae reach to the posterior edge of the second thoracic segment, and 

 contain ten segments each. Only the right antennule is represented. 



FIG. 2. The external ramus of the fourth swimming feet. All the rami of the 

 swimming feet are two-jointed. The proximal seta of the inner margin is conspicu- 

 ously separated from the remaining setse, which become the inner armature of the 

 terminal segment after the formation of the third joint. 3X7- 



FIG. 3. The rudimentary fifth foot is characteristic of the species C. signatus. 

 The hairs are neither setose nor spiny. 3X7- 



The internal fringe of hairs on the caudal stylets, the short, broad, basal segment 

 of the fifth foot, and the short second joint of the antennule indicate that this is the 

 larval form of C. siynatits coronatus. 



o 



FIG. 4. An antenna with nine segments. 



FIG. 5. An antenna showing the third segment dividing to form the tenth segment. 



FIG. 6. An antenna with ten segments fully formed. 



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