144 AMPHIDROMUS, GROUP IV. 



others of stouter contour, of a very pale buff tint, almost white (pi. 

 50, figs. 31, 33, 34). This may be called color var. pallidulus. Two 

 specimens measure : the stoutest, alt. 44, diam. 26^, longest axis oi 

 aperture 24^ mill.; and the most slender, alt. 46, diam. 25, longest 

 axis of aperture 23^ mill. A dextral specimen of this color-form (fig. 

 31) is more slender, alt. 40, diam. 20, aperture 20 mill. This is the 

 only dextral chloris I have seen or heard of, and may perhaps be re- 

 garded as an atavistic individual. Another shell (fig. 30) is quite 

 small, and pale lemon-yellow. 



BASILAN. The Steere Expedition also collected examples of 

 chloris on Basilian island (figs. 32, 35, 36-38), where Semper did 

 not find it. They aie identical in form with Samboanga shells, but 

 vary in color as follows : (a) Color of the typical yellow tint, but 

 rapidly fading to white on the spire, pi. 50, fig. 35. (b) Pale citron 

 or greenish-yellow, the spire white, fig. 37. (c) Similar to color-var, 

 pallidulus, but with a slightly darker sutural border and no white 

 band, (d) Pure white throughout, color-var. purissimus, fig. 32. 

 (e) Pale yellow or rufous, with oblique reddish-brown streaks on the 

 spire or throughout, the suture narrowly marked with the same, 

 color-var. calista, fig. 36. (f) Brilliant rose-pink, with white sub- 

 sutural band and darker sutural line to the apex, color-var. rosa, 

 fig. 38. 



Figure 28 is a copy of Reeve's type figure. Figs. 29-31, 33, 34 

 are from Samboanga, 32, 35. 36-38 from Basilan specimens. 



A. ROESELERI Moellendorff. 



Shell sinistral, half-covered perforate, ovate-conic, solid, trans- 

 versely lightly striatulate, decussated by delicate and close but very dis- 

 tinct spiral lines; satin-like, white. Spire moderately long, with 

 slightly convex sides and obtuse apex. Whorls 6, moderately con- 

 vex. Aperture moderately oblique, subauriform ; peristome rather 

 widely expanded, white-lipped, a little reflexed, columella straight, 

 forming a rather distinct angle with the basal margin, heavily cal- 

 loused, dilated above, revolute, nearly covering the perforation. Alt. 

 47, diam. 27, aperture 24.5 mill, long, 18 wide (Mlldff.}. 



Sulu Island (I. Roeseier). 



A. roeseleri MOELLENDORFF, Nachrbl. d. D. Malak. Ges. xxvi, p. 

 210 (Dec. 1894), FULTON, Ann. Mag. N. H. (6), xvii, p. 75.^!. 

 maculiferus var., SMITH, Ann. Mag. N. H. (6), xiii, p. 55, pi. 4, f. 

 9, 9a (Jan., 1894). 



