342 U.S. NATIONAL MUSEUM BULLETIN 287 



woodworthi, Admete 1905. N. vol. 18, no. 11, p. 123 (Monterey Bay, 



California). 

 xanthicus, Conus 1910, PUSNM, vol. 38, no. 1741, p. 225 (ALBA- 

 TROSS sta. 3011, off Guaymas, Mexico; USNM 111236). 

 xantusi, Epitoniiim 1917, PUSNM, vol. 53, no. 2217, p. 475 (Cape 



San Lucas and La Paz, Lower California; USNM 4107). 

 xantusi, Phacoides (Miltha) 1905, N, vol. 18, no. 10, p. 111. New 



name for Phacoides (Miltha) childreni 'Gray' Carpenter, 1863, 



7iot Gray, 1825. 

 xenia. Alia 1919, PUSNM, vol. 56, no. 2295, p. 330 (Cape San 



Lucas [Lower California] ; USNM 59370). 

 xesta, Chione (Lirophora) 1903, TWFIS, vol. 3, pt. 6, p. 1297, pi. 



55, fig. 18 (Miocene, Alum Bluff, Calhoun County, Florida); 1905, 



Schuchert, Dall et al, USNMB 53, pt. 1, p. 146 (USNM 115720a). 

 xestra, Boreolrophon 1918, PUSNM, vol. 54, no. 2234, p. 232 



(ALBATROSS sta. 4813, off Sado Island, Japan; USNM 



205508). 

 xylona^ Pleurotomella (Gymnobela) 1908, BMCZ, vol. 43, no. 6, 

 ' pp. 214, 280, pi. 2, fig. 3 (ALBATROSS sta. 3413, near Galapagos 



Islands; USNM 123111). 

 Xylotomea 1898, TWFIS, vol. 3, pt. 4, p. 821. New name for 



Xylophaga Turton, 1822, not Xylophagus Meuschen, 1788. 

 xystrum, Retusa 1919, PUSNM, vol. 56, no. 2295, p. 297 (Sar 



Diego, California; USNM 273985). 

 yatesii, Subemarginula 1901, N, vol. 14, no. 11, p. 125 (bought, 



Monterey, California); 1902, PUSNM, vol. 24, no. 1264, p. 555, 



pi. 38, figs. 1, 3. 

 yessoensis, Antiplanes 1925, PUSNM, vol. 66, art. 17, no. 2554, p. 



4, pi. 21, fig. 3 (ALBATROSS sta. 5036, off S coast of Yesso 



(Hokkaido) [Japan]; USNM 111053). 

 yorkensis, Diplodonta 1900, TWFIS, vol. 3, pt. 5, p. 1185, pi. 43, 



fig. 5 (Miocene, near Yorktown, York River, Virginia); 1905, 



Schuchert, Dall et al, USNMB 53, pt. 1, p. 228 (USNM 144548). 

 yorkensis, Sportella 1899, PUSNM, vol. 21, no. 1177, p. 882, n.n.; 



1900, TWFIS, vol. 3, pt. 5, p. 1130, pi. 44, fig. 1 (Miocene, 



Yorktown, York River, Virginia); 1905, Schuchert, Dall et al, 



USNMB 53, pt. 1, p. 622 (USNM 144323). 

 youngi Dall and Bartsch, Odostomia (Evalea) 1910, MCDM 14-N, 



p. 16, pi. 2, fig. 1 (Barkley Sound, Vancouver Island, British 



Columbia; USNM 211542; CGSM). 

 yucatecana, Marginella 1881, BMCZ, vol. 9, no. 2, p. 72 (Yucatan 



Strait [Mexico]); 1889, BMCZ, vol. 18, p. 138, pi. 19, fig. 5. 

 yucatecanum, Bittium ? 1881, BMCZ, vol. 9, no. 2, p. 90 (Yucatan 



Strait [Mexico]); [as Mathilda yucatecana] 1889, BMCZ, vol. 



