U. S. NATIONAL MUSEUM 



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13-17. Cymbephallus fimbriatus Linton from Menticirrhus saxatilis: 13, Specimen with 

 pedicillate acetabulum; 14, another, with acetabulum retracted; IS, acetabulum, 

 slightly diagrammatic; 16, anterior end of another specimen, slightly diagram- 

 matic,' ejaculatory duct shorter than in most cases; 17, ventral view of genital 

 aperture. 



18-20. Cymbephallus vitellosus (Linton): 18, From Trachurops crumenophthalma, ventral 

 view; 19, from Pomatomus saltatrix; 20, small distome, strongly contracted, from 

 a 20-mm. Sphoeroides maculatus. 



