PLATE 23

FIGonE 1, 7, 133. Tarr itella (Torcula) alttlira altitira Conrad (p. 102).
 Middle part of Gatun formation.
 1. Height (incomplete) 7.6 min, diameter 1.2 mim. Locality 147b. USNM 561381.
 7. Topotype. Height (incomplete) 43.5 mm, diameter 17.5 mm. Locality 150a. USNM 561378. 12. Height (incomplete) 73 mii, diameter 13 mm. Locality 155b. USNM 561379. 13. Height (incomplete) 63 mm, diameter 19 mo. Locality 159. USNM 561380. 2, 8. Turritella (Torcla) altilira prccellens Pilsbry and Brown (p. 105).
 Locality 138. Lower part of Gatun formation. USNM 561383.
 2. Height (incomplete) 30.5 mm, diameter 13 mm. 8. Height (incomplete) 42 am, diameter 12.5 mm.
 3. Rissoina (Phosinella) oncera Woodring, n. sp. (p. 77).
 Type. Height 4.3 mm, diameter 1.7 men. Locality 177c. Upper part of Gatun formation, eastern area. USNMI 561332.
 4, 5, 9, 14. Turritella gaumensis yalunensis Conrad (p. 108).
 4, 9. Locality 159. Middle part of Gatun formation. USNM 561392. 4, Height (incomplete) 31.4 mm, diameter 9 iim. 9, Height (incomplete) 42.5 mm, diameter 15.2 mm.
 5. Height (incomplete) 7.3 mm, diameter 2.5 mm. Locality 138. Lower part of Gatun formation USNMt 561394
 14. Height (almost complete) 58.5 nim, diameter 15 mm. Locality 138. Lower part of Gatun formation. USNM 561393.
 6, 15, 16. Turritella abrupta Spiker (p. 106).
 Middle part of Gatin formation.
 6. Height (incomplete) 8 mm, diameter 3.6 mm. Locality 161d. USNMI 561388. 15. Height 1.8 mii, diameter 1 mm. Locality 170a. USNM 561389. 16. Height (incomplete) 39 mm, diameter 23 mm. Locality 144a. UISNM 561387. 10, 11, 17. Turritella galmmensis rhylodes Woodring, n. subsp. (p. 109).
 Locality 162a. Middle part of Gatun formation. 10. Height (incomplete) 41.7 moe, diameter 13 nn. USNM 561429. 11. Height (incomplete) 38.7 mm, diameter 11.8 mm. USNM 561429. 17. Type. Height (incomplete) 66 mm, diameter 16.5 mm. USNM 561395.