Fig. 14 in A middle Eocene seep deposit with silicified fauna from the Humptulips Formation in western Washington State, USA

Fig. 14. The provannid gastropod Provanna fortis sp. nov. from the middle Eocene Satsop Weatherwax seep deposit, Washington State, USA. A. NRM Mo 185027, teleoconch with 2.5 whorls (A1); basal view showing spiral cords and aperture with siphonal notch (A2). B. NRM Mo 185028 (holotype); part of protoconch and teleoconch with 3 strongly angular whorls with spines (B2); close-up on protoconch (B1); spiral suture and fading axial rib (B3); growth increments (B4).