Part 1. 



PHILIPPINE LAND SHELLS BARTSCH. 



39 



Amphidromus dubius Hidalgo, Mem. Acad. Real Sci., Madrid, 1898, pi. 



101, figs. 7-8. 

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



Gorlitz, vol. 22, 1898, p. 150. 

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



Gorlitz, vol. 22, 1898, p. 150. 

 Amphidromus quadrasi dubius and everetti Pilsbry, Man. Conch., vol. 13, 



1900, p. 231, pi. 71, figs. 79-83, and pi. 70, figs. 65-68. 



In the present form the early extreme apex is dark. In every 

 specimen before us the succeeding turn or turn and a half is white. 

 Following this, we have axial, retractive, broad bands of brown 

 separated by narrow bands of light yellow or white. At times these 

 bands become forked and variously diversified, in some instances end- 

 ing in a number of fine streaks on the upper half of the whorl. 

 There may be or may not be a red subsutural band present as in 

 typical quadrasi. On the last whorl the axial banding in all our 

 specimens becomes very much enfeebled and in some has disappeared 

 entirely. The base may be plain yellow or banded with spiral bands 

 of brown and yellow. The umbilical area is usually red, bordered 

 with a yellow band posteriorly, though in several of the specimens 

 the red is entirely wanting, the yellow covering the entire area. The 

 aperture may be pale purple, the yellow spiral bands appearing white 

 within, or it may be white with the number of bands appearing paler 

 on the inside. The lip may be white or purple. This form is dis- 

 tinguished from the next chiefly by the conspicuous coloring of the 

 base, the spiral bands being practically absent in solicla. I have seen 

 the following specimens : 



AMPHIDROMUS QUADRASI PALAWANENSIS, new subspecies. 



Plate 1, fig. 15 ; plate 20, figs. 1, 4, 6-9. 

 Shell more elongate than typical quadrasi. Apex black, the suc- 

 ceeding turn white, and all but the last turn or turn and a half are 

 marked with axial bands of brown which usually break up into finer 

 branches on the posterior half of the whorls. The last portion of the 



