p art l. PHILIPPINE LAND SHELLS BARTSCH. 45 



Fig. 3. Amphidromus entobaptus linapacensis Bartsch, Linapacan Island, Cat. 

 No. 215599, U.S.N.M. 



4. Amphidromus entobaptus busuangensis Bartsch, Malbato, Busuanga, Cat. 



No. 215643, U.S.N.M. 



5. Amphidromus entobaptus busuangensis Bartsch, Malbato, Busuanga, 



"Webb Collection. 



6. Amphidromus entobaptus busuangensis Bartsch, Malbato, Busuanga, 



Webb Collection. 



7. Amphidromus entobaptus busuangensis Bartsch, Malbato, Busuanga, Cat. 



No. 215643, U.S.N.M., type. 



8. Amphidromus entobaptus busuangensis Bartsch, Malbato, Busuanga, 



Webb Collection. 



9. Amphidromus entobaptus busuangensis Bartsch, Malbato, Busuanga, 



Webb Collection. 



Plate 17. 



Fig. 1. Amphidromus quadrasi quadrasi Hidalgo, Balabac Island, Webb Col- 

 lection. 



2. Amphidromus quadrasi quadrasi Hidalgo, Candaraman Island, Cat. No. 



215605, U.S.N.M. 



3. Amphidromus quadrasi quadrasi Hidalgo, Balabac Island, Cat. No. 



661S8, Phila. Acad. Nat. Sci. 



4. Amphidromus quadrasi quadrasi Hidalgo, Caxisigan Island, Cat. No. 



215603, U.S.N.M. 



5. Amphidromus quadrasi quadrasi Hidalgo, Caxisigan Island, Cat. No. 



215603, U.S.N.M. 



6. Amphidromus quadrasi quadrasi Hidalgo, Candaraman Island, Cat. No. 



215605, U.S.N.M. 



7. Amphidromus quadrasi quadrasi Hidalgo, Candaraman Island, Cat. No. 



215605, U.S.N.M. 



8. Amphidromus quadrasi quadrasi Hidalgo, Candaraman Island, Cat. No. 



215605, U.S.N.M. 



9. Amphidromus quadrasi quadrasi Hidalgo, Caxisigan Island, Cat. No. 



215603, U.S.N.M. 



10. Amphidromus quadrasi quadrasi Hidalgo, Candaraman Island, Cat. No. 



215605, U.S.N.M. 



11. Amphidromus quadrasi quadrasi Hidalgo, Balabac Island, Webb Col- 



lection. 



Plate 18. 



Fig. 1. Amphidromus quadrasi versicolor Fulton, Balabac, Cat. No. 79483. 

 Phila. Acad. Nat. Sci. 



2. Amphidromus quadrasi versicolor Fulton, Balabac, Cat. No. 98S52, 



Phila. Acad. Nat. Sci. 



3. Amphidromus quadrasi versicolor Fulton, Webb Collection. 



4. Amphidromus quadrasi versicolor Fulton, Balabac, Cat. No. 95152, 



Phila. Acad. Nat. Sci. 



5. Amphidromus quadrasi versicolor Fulton, Webb Collection. 



6. Amphidromus quadrasi versicolor Fulton, Cat. No. 79483, Phila. Acad. 



Nat. Sci. 



7. Amphidromus quadrasi versicolor Fulton, Cat. No. 9S852, Phila. Acad. 



Nat. Sci. 



