USNM 307374 Carapace (converted to fluorite); topotype of type species of Bairdiacypris Bradfield (1935); Locality 13 of Bradfield, south edge Ardmore, Carter County, Oklahoma, USA (Sohn, 1960, p. 57).

1a. Carapace right lateral view, stereopair; L = 0.66 mm, H = 0.26 mm. 1b. Carapace antero-ventral detail; width 0.48 mm. 2a, b. Fabalicypris warthini (Bradfield, 1935) USNM 307375 Carapace; Locality Carter County, Oklahoma, USA (Sohn, 1960, p. 64). 2a. Carapace right lateral view, stereopair; L = 0.98 mm, H = 0.42 mm; note strong LV dorsal margin overhang and LV ventral margin extension or “step”. 2b. Carapace anterior to show ventral margin “step”. 3. Fabalicypris warthini (Bradfield, 1935) USNM 307376 Carapace, left lateral view; L = 0.92 mm, H = 0.42 mm; Locality as Figure 2. 4. Fabalicypris warthini (Bradfield, 1935) USNM 307377 RV, internal lateral view of anterior to show width of marginal zone and vestibule; H = 0.39 mm; Locality as Figure 2.