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_ 21:0800 Axinia barbarensis Conr. Is Glycymeris Db. 
21:0801 Axinia intermedia Cp. in part (non Brod.), is Glycy- 
meris barbarensis. 
2619 Axinopsis sericatus Cpr. ’ he 
2618 Axinopsis viridis Dall. : se? 
666 Barbatia gradata Sowerby. tf 
214 Barleeia haliotiphila Cpr veces 7 
79 Barleeia subtenuis rea Se & 
21:1377 Barleeia subtenuis rimata Cpr. 
21:0703 Genus Barnea (Leach) Risso, 1826. 
21:0704 Barnea pacifica Stearns, 1871. 
2620 Genus Bathytoma 
2695 Bathytoma Carpenteriana 
2621 Bathytoma Keepi Arnold. 
2694 Bathytoma Tremperiana 
1218 Bela crebricostata Carpenter. 
668 Bela exarata Moller. 
‘669 Bela excurvata Carpenter. 
21:0802 Bela fidicula Gld., 1849 sub Fusus. 
2576 Bela Grippi 
671 Bela tabulata Carpenter. 
21:0803 Bela sanctae-monica Arnold, 1903. 
21:0804 Bela sculpturata Dall. Is Mangilia s. 
672 Bela trevelliana Turton. 
673 Bela violacea Mighels. 
674 Berendtia taylori Pfeiffer. 
539 Beringius aleuticus Dall. 
1394 Beringius crebricostatus Dall. : 
538 Beringius frielei Dall. aeh cSicpai 
1395 Beringius? kennicottii Dall. 
Genus Bifidaria Sterki. 1891. 
2551 + +#«4Bifidaria agna 
1821 Bifidaria armifera: eastern U. S. 
1946 Bifidaria Ashmuni 
2686 Bifidaria bilamellata 
21:0206 Bifidaria clementina oldroydae E. G. Vanatta. 
1825 Bifidaria hebes (See 1593). 
1827 Variety Mexicanorum Ckll. Mesilla, N. M. 
1826 Forma saxicola Ckll. Near Silver Cliff, Colo. 
1822. Bifidaria hordeacea: Ariz.—N. M. 
1824 Bifidaria hordeacella 
1984 Bif. hordeacella parvidens Bees 
2589 Bifidaria pellucida hordeacella 
2001+ Bifidaria pentodon 
1957 Bifidaria perversa ~“ 
1959 Forma minor Sterki. Nogales, Arizona. 
1828 Bifidaria Pilsbryana Sterki. 
1823 Bifidaria procera 
2926 Bifidaria procera cristata : 
1983 Bifidaria quadridentata Sterki. oti 
2927 + Bifidaria riograndensis Sterki, ined. Kei 
2717 =Bifidaria (Chaenaxis) tuba intuscostata ,; 
675 Binneya notabilis Cooper. Al 
215 Bithinella binneyi Tryon. 
216 Bithinella intermedia Tryon yar 
21:0805 GenusBittium Leach. 
2622 Bittium acicula Stimp. 
209 Bittium armillatum Cpr OS a Toe 
