10 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



apocnsis. These two forms have developed along parallel lines, but 

 are quite distinct. 



The little race of Amphidromus occurring on the island of Basilan, 

 which I have called basilanensis, is related to these last two forms, 

 as is the shell from Lampinigan Island, which is too poor to serve 

 for diagnosis. 



There remains but one shell of the group of maculiferus which 

 is to be considered in this monograph and that is Amphidromus 

 floresi. This form has indications of the black filations on the 

 early whorls which would ally it to maculiferus, but it differs mark- 

 edly in form from any of these and also in its sculpture, the surface 

 being ornamented with numerous, slender, thread-like riblets. This 

 shell comes from southeastern Mindanao. 



DESCRIPTIONS OF SPECIES. 

 AMPHIDROMUS MACULIFERUS MACULIFERUS Sowerby. 



Plate 2, figs. 1-5. 



Bulinus maculiferus Sowerby, Conch. 111., 1838, pi. 145, fig. 100. 



Bulinus maculiferus Broderip, Proc. Zool. Soc. London, vol. 9, 1841, pp. 



14-15. 

 Bulimus maculiferus Reeve, Conch. Icon., vol. 5, 1S48, pi. 6, fig. 26a. 

 Bulimus per versus Linnaeus, var E. Pfeiffer, Mon. Hel. Viv., vol. 2, 1848, 



p. 38. 

 Bulimus maculiferus Pfeiffek, Zeitschr. f. Malak., 1849, p. 134. 

 Amphidromus maculiferus Albers, Heliceen, 1850, pp. 138-140. 

 Bulimus maculiferus Pfeiffek, Mon. Hel. Viv., vol. 3, 1853, p. 319. 

 Bulimus maculiferus, var Pfeiffer, Mon. Hel. Viv., vol. 3, 1853, p. 319. 

 Bulimus maculiferus Pfeiffer, Mart. Chem. Conch. Cab., vol. 1, pt. 13, 1855, 



pp. 117-11S, pi. 36, figs. 1-2. 

 Bulimus (Amphidromus) maculiferus Pfeiffer, Malak. Bliit., 1855, vol. 2, 



p. 147. 

 Bulimus (Canistrum) maculiferus H. and A. Adams, Gen. Rec. Moll., 1858, 



p. 143. 

 Bulimus maculiferus Pfeiffer, Mon. Hel. Viv., vol. 4, 1859, p. 3S1. 

 Bulimus maculiferus Pfeiffer, Mon. Hel. Viv., vol. 6, 1868, p. 25. 

 Amphidromus maculiferus Semper, Reis. Arch. Phil., vol. 3, 1873, p. 146, 



pi. 14, fig. 18. 

 Bulimus maculiferus Pfeiffer, Mon. Hel. Viv., vol. 8, 1877, p. 39. 

 Amphidromus maculiferus Hidalgo, Journ. de Conch., vol. 36, 1S88, p. 31. 

 Amphidromus maculiferus Elera, Cat. Sist. Faun. Filip., 1896, p. 617. 

 Amphidromus maculiferus obscura Fulton, Ann. Mag. Nat. Hist., ser. 6, 



vol. 17, 1896, p. 75. 

 Amphidromus maculiferus von Mollendorff, Abhand. Naturf. Ges. Gorlitz, 



vol. 22, 1898, p. 149. 

 Amphidromus maculiferus obscura von Mollendorff, Abhand. Naturf. Ges. 



Gorlitz, vol. 22, 1S98, p. 149. 

 Amphidromus maculiferus Pilsbry, Man. Conch., vol. 13, 1900, pp. 130- 



131, pi. 49, figs. 19-21. 

 Amphidromus maculiferus obscura Pilsbry, Man. Conch., vol. 13, 1900, 



p. 131. 



