38 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



AMPHIDROMUS QUADRASI SOLIDUS Fulton. 



Plate 1, figs. 8, 9, 12, 13, 14 ; plate 19, figs. 1, 3, 7 ; and plate 20, figs. 3, 5. 

 Amphidromus quadrasi, var. c, Smith, Ann. Mag. Nat. Hist., ser. 6, vol. 11, 



1893, p. 351, pi. 18, fig. 13. 

 Amphidromus quadrasi, var solida Fulton, Ann. Mag. Nat. Hist., ser. 6, 



vol. 17, 1896, p. 86, pi. 5, fig. 16. 

 Amphidromus quadrasi solidus von Mollendorff, Abhand. Naturf. Ges. 



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

 Amphidromus quadasi solidus Pilsbey, Man. Conch., vol. 13, 1900, p. 230, 



pi. 66, figs. 47, 48, and pi. 71, figs. 72-76. 



In the present form the conspicuous bands of the base are practi- 

 cally absent. If present at all, they are a mere suggestion. The col- 

 oration of the early whorls is blotched and streaked with brown, like 

 that of dubius. The extreme apex also is black. The red subsutural 

 band may or may not be present. The last whorl may be streaked 

 with green as in typical quadrasi, or may be orange-yellow or white 

 or even suffused with " Spinel red." Of this form, we have seen the 

 following material : 



AMPHIDROMUS QUADRASI DUBIUS Fulton. 



Plate 1, fig. 10 ; plate 19, figs. 2, 4, 5, 6, 8, 9 ; plate 20, fig. 2. 



Amphidromus quadrasi, var. / Smith, Ann. Mag. Nat. Hist., ser. 6, vol. 11, 



1893, p. 351, pi. 18, fig. 12. 

 Amphidromus dubius Fulton, Ann. Mag. Nat. Hist., ser. 6, vol. 17, 1896, 



p. 86, pi. 6, figs. 1, la. 

 Amphidromus cvcrctti Fulton, Ann. Mag. Nat. Hist., ser. 6, vol. 17, 1896, 



p. 87. 



