U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL 89 PLATE 19 



SPECIES AND SUBSPECIES OF X ENOPO MOI DES. XENOPOMA. OPI STHOSI PHON , AND 



DALLSIPHONA (X 4). 



1. Xenopommdes delicatidum: 2. Xenopoma hvitrtx: .5, X^nopoma henderioni: 4, Opi_~tliusiphon (Cyljndru~tphona) 

 bacUlum bacillum: 5, O. (C.) b. ganiai: 6, Dalhiphona dalli: 7, Xenopoma aguayoi: S, A. iiumholdtianum: A .\. 

 ipinosissimum. 



