388 The Molluscan Family Planorbidae 



PLATE 76 



Shells of Planorbidae 



1. Planorbis krambergeri Halavats. Resultate d. Wissens. Erforsch. des Balatonsee, 



plate 3, figs. 3a, 3b, 3c. X6. 



2. Odontogyrorbis krambcrgeri (Halavats). Lorenthay, op. cit., Art. 3, plate 2, fig. 17. 



About X5. 



3. Costorbis strauchianits (Clessin). Conch. Cab., XVII, plate 31, fig. 5. X3. 



4. Segmentina nitida (Miiller). Apertural lamellae. Greatly enlarged. 



5. Polypylis hemisphacrida (Benson). Apertural lamellae. Greatly enlarged. 



6. Armiger crista (Linn.). Forbes and Hanley, Hist. Brit. Moll., IV, plate 126, figs. 



6, 7. About X4. 



7. Tropicorbis obstnictus (Morelet). Lamellae on outer lij). Enlarged. 



8. Planorbula armigcra (Say). Lamellae on outer lip. Greatly enlarged. 



9. Planorbida icheatleyi (Lea). Lamellae on outer lip. Greatly enlarged. 



10. Drepanotrema cultratum (Orbigny). From Bolivar, Colombia. Penial complex. 



Pilsbry, 1934, fig. 6, E (after H. B. Baker); fl, flagellum; vd, vas deferens; pr, 

 penial retractor, vide Pilsbry. 



11. Pompholopsis whitei Call. Amer. Geol., I, p. 147, figs. 5-7. 



12. Vorticifex tryoni (Meek). White, Proc. U.S. Nat. Mus., V, plate 5, figs. 5-7. 



13. Vorticijex binneyi (Meek). Op. cit., figs. 8, 9. 



Figures 11 to 13 are natural size 



