Plate 74 
This plate from Proceedings of the United States National Museum. 
FIGURE 
1. Bittium serra Bartsch. 
2. Bittium challisac Bartsch. 
3. Bittium santamariensis Bartsch 
4. Bittium sanjuanensis Bartsch.. 
5. Bittium bartolomcnsis Bartsch. 
6. Bittium challisac Bartsch. 
PAGE 
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