. Smithsonian miscellaneous collections . LINGULELL A-ACROTHYRA. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 67, NO. 9, PL. 123. Zemlaya Brachlopods. NO. 9 CAMBRIAN AND OZARKIAN BRACHIOPODA 551 DESCRIPTION OF PLATE 123 PAGE Lingulella arctica Walcott 524 Fig. 1. (X3-) An exfoliated ventral valve. 2. (X 3-) A partially exfoliated dorsal valve. Lingulella cf. desiderata Walcott 524 Figs. 3 and 4. (X 6.) Dorsal (X6.) Ventral valve. Billingsella holtcdahli Walcott 525 Fig. 6. (X2.) View of a partially exfoliated ventral valve, preservingpart of main vascular
. Smithsonian miscellaneous collections . LINGULELL A-ACROTHYRA. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 67, NO. 9, PL. 123. Zemlaya Brachlopods. NO. 9 CAMBRIAN AND OZARKIAN BRACHIOPODA 551 DESCRIPTION OF PLATE 123 PAGE Lingulella arctica Walcott 524 Fig. 1. (X3-) An exfoliated ventral valve. 2. (X 3-) A partially exfoliated dorsal valve. Lingulella cf. desiderata Walcott 524 Figs. 3 and 4. (X 6.) Dorsal (X6.) Ventral valve. Billingsella holtcdahli Walcott 525 Fig. 6. (X2.) View of a partially exfoliated ventral valve, preservingpart of main vascular sinuses and inner markings of shell. 7. (X 2.) Partial interior of a dorsal valve. See fig. 15. 8. (X2.) Partly exfoliated dorsal valve. 9. (X2.) Partly exfoliated ventral valve. 10. (X 2.) Dorsal valve with a shallow median furrow. 11. (X 2.) Dorsal valve with outer surface layer exfoliated. 12. (X 3-) Top view of a small ventral valve. l3- (X 2.) Dorsal valve with outer surface preserved. 14. (X2.) Exterior of ventral valve with outer surface layer more or less exfoliated. 15. (X2.) Partially exfoliated dorsal valve. S
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