398 The Molluscan Family Planorbidae 



PLATE 81 



Shells of Planorbidae 



1. Poecilospira trochiformis (Stahl). Steinheiin, Germany. Showing extreme range 



of variation from short, flattened spire to long, conical spire. M.C.Z. X2. 



2. Ajroplnnorbis adoivensis (Bourg.). Belgian Congo, Africa. Pilsbry and Bequaert, 



Bull. Amer. Mus. N.H., LIII, fig. 4, p. 118. Xfi/^. 



3. Afroplanorbis sudanicus (Martens). Bahr-el-Ghazal, Africa. U.S.N. M., 215381. 



Pilsbry and Bequaert, op. cit., fig. 7, p. 122. Xli/4. 



4. Biomphalaria smithi Preston. Upper figures, specimen from Kabare, Lake Edward, 



Africa; lower figures, paratypes from Lake Edward. Pilsbry and Bequaert, op. 

 cit., fig. 6, p. 121. Xli^. 



5. Paraplanorbis condoni (Hanna). Vicinity of Warner Lake, eastern Oregon. Pliocene 



period. Hanna, Univ. Oregon Pub., I, No. 12, plate 1, figs. 1-3. About X7. 



6. Planorhijex vanvlecki (Arnold). North dome Kettleman Hills, King Co., Cali- 



fornia. Pliocene. PiLsbry, Proc. Acad. Nat. Sci. Phil., 86, plate 21, fig. 9, a, b, c. 

 Reduced one-half from Pilsbry "s figure. Line indicates 1 mm. 



7. Choanomphalus inaacki Ger.stfeldt. Crosse and Fischer, Jour, de Conch., XXVH, 



plate 4, fig. 9. 



8. Choanomphnlus valvatoidcs Dybowski. Op. cit.. plate 4, fig. 8. 



9. Choanomphalus schrenckii Dybowski. Op. cit., plate 4, fig. 10. Line near figures 



8-10 indicates natural size. 



10. Anisopsis calculus (Sandberger) . Land und Siiss.-Conch. Vorwelt, taf. 1, figs. 7, 7a. 



(stark vergrossert). 



11. Anisopsis loryi (Coquand). Op. cit., taf. 1, figs. 28, 28a, 28b. 



