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EXPLANATION OF PLATE 19 

 Figure Page 



123. Gastrochaena ovata Sowerby 93 



Fig. a. Exterior view of left valve. Fig. b. Exterior view of 

 right valve. 



124. Cyrtopleura costata (Linne) 94 



125. Barnea tnincata (Say) 94 



126. Martesia cnneiformis (Say) 94 



127. Martesia striata (Linne) 95 



Fig. a. Umbonal view both valves together. Fig. b. Mollusks 

 burrowed in wood. 



