PLATE XXXIII. 
PAGE 
Figs. 1-6. Balaxvs concavvs Brown 94 
1. Lateral view of large specimen. Jones Wharf. 
2a. Scuta and terga. St. Mary's River. 
2b. Lateral view of the same. 
3a. Exterior of left scutum. 
3b. Interior of the same. 
4a. Interior of right scutum. 
4b. Exterior of the same. 
5a. Exterior of right tergum. 
5b. Interior of the same. 
6a. Exterior of left tergum. 
6b. Interior of the same. 
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