| Bactrocythara asarca (Dall & Simpson, 1901) |
| Bathytoma Harris & Burrows, 1891 |
| Bathytoma mitrella (Dall, 1881) |
| Bathytoma viabrunnea (Dall, 1889) |
| Bellacythara McLean, 1971 |
| Bellacythara bella (Hinds, 1843) |
| Bellaspira Conrad, 1868 |
| Bellaspira amplicostata Fallon, 2016 |
| Bellaspira melea Dall, 1919 |
| Bellaspira pentagonalis (Dall, 1889) |
| Benthomangelia Thiele, 1925 |
| Benthomangelia antonia (Dall, 1881) |
| Benthomangelia bandella (Dall, 1881) |
| Borsonella Dall, 1908 |
| Borsonella (Borsonellopsis) McLean, 1971 |
| Borsonella (Borsonellopsis) agassizii (Dall, 1908) |
| Borsoniinae Bellardi, 1875 |
| Brachycythara Woodring, 1928 |
| Brachycythara barbarae Lyons, 1972 |
| Brachycythara biconica (C. B. Adams, 1850) |