40 



BULLETIN 100 ; UNITED STATES NATIONAL MUSEUM. 



shells lacks this brown banding and is unicolor, excepting the spiral 

 bands of yellow on the base. The entire surface of the shell is suf- 

 fused with a brownish wash which gives the whole a dusky aspect. 

 Aperture pale purple within, lip dark brown. In all but one speci- 

 men the middle of the base is encircled by a moderately broad 

 yellow band. The columellar area also shows indications of a second 

 yellow band surrounding it, though the portion immediately ad- 

 joining the columella is purplish brown. All of the shells have a 

 subsutural red band which is toned down strongly by the brownish 

 suffusion. 

 The specimens examined yield the following data : 



EXPLANATION OF PLATES. 

 Plate 1. 

 Fig. 1. Amphidromus maculiferus cotabatensis Bartsch. 



2. Amphidromus maculiferus boholensis Bartsch. 



3. Amphidromus inflatus Fulton. 



4. Amphidromus chloris Reeve. 



5. Amphidrovius suluensis Bartsch. * . 



6. Amphidromus cntobaptus culioncnsis Bartsch. 



7. Amphidrovius quadrasi versicolor Fulton. 



8. Amphidromus quadrasi solidus Fulton. 



9. Amphidromus quadrasi solidus Fulton. 



10. Amphidromus quadrasi dubius Fulton. 



11. Amphidromus quadrasi quadrasi Hidalgo. 



12. Amphidromus quadrasi solidus Fulton. 



13. Amphidromus quadrasi solidus Fulton. 



14. Amphidromus quadrasi solidus Fulton. 



15. Amphidromus quadrasi palawanensis Bartsch. 



Plate 2. 



Fig. 1. Amphidromus maculiferus maculiferus Sowerby, Camp Overton, Min- 

 danao, Cat. No. 244668, U.S.N.M. 



2. Amphidromus maculiferus maculiferus Sowerby, Camp Pautar, Min- 



danao, Cat. No. 24467, U.S.N.M. 



3. Amphidromus maculiferus maculiferus Sowerby, Camp Overton, Min- 



danao, Cat. No. 244668, U.S.N.M. 



4. Amphidromus maculiferus maculiferus Sowerby, Philippine Islands, Cat. 



No. 99567, U.S.N.M. 



5. Amphidromus maculiferus maculiferus Sowerby, Camp Overton, Min- 



danao, Cat. No. 244669, U.S.N.M. 



