U.S. NATIONAL MUSEUM 



BULLETIN 291, PLATE 3 



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Balhyteulhis abyssicola, a-c, female, 57 mm ML, Elt. 354; d-f, 50 mm ML: a, Brachial 

 crown with buccal membrane expanded; b, brachial crown showing connectives of the 

 buccal membrane; c, distal tip of left Arm IV; d, upper beak; e, lower beak; f, radula. 



