AMPHIDROMUS, GROUP XIX. 231 



streaked with reddish-brown except for a pale belt below the suture, 

 and with a greenish belt below the periphery, or (fig. 85) pale 

 yellow with faint green oblique lineation, interrupted at periphery. 

 Aperture and lip white except in the red stained form ; the columella 

 and its vicinity either white or pink-tinted. Length 47, diam. 20. 

 Length 43, diam. 22. Length 38, diam. 18. Length 35, diam. 

 18-19. Length 33, diam. 161. Length 24J, diam. 14 mill. 



Balabac Island. 



In a series of four specimens from Fulton, collected by Everett, 

 and six collected by Steere, no two are alike in markings or size. 

 The smallest specimen before me is figured, pi. 66, fig. 42. It has 

 5^ whorls and a peripheral brown band. The largest shells have 

 fully 7 whorls. Steere collected green-lineate specimens with and 

 without a red sutural line connecting with the typical quadrasi. 



Color-form dubius Fulton. PI. 71, figs. 79-83. Ground-color 

 yellow below, whitish on the spire, copiously striped above the peri- 

 phery with bluish gray, becoming brown on the spire, the stripes con- 

 tinuous or branching above ; the base with a band below the 

 periphery and usually another midway,. the columellar region pale or 

 stained with Ted ; suture with a pale or a red margin. Aperture 

 usually dark within, the lip white, columella white or pink. Some- 

 times the stripes coalesce to a uniform bluish band over the whole 

 upper surface of the last whorl. Dimensions variable. 



Balabac Island. 



Figures 79, 80 are Fulton's types, figs. 81-83 other specimens col- 

 lected by Steere. The periphery may be subangular or as rounded 

 as in qtiadrasi) indifferently. It is distinguished from A. adamsi 

 pictus by the locality ; from A. everetti by the white lip. 



Color-form everetti Fulton. PI. 70, figs. 65, 66, 67, 68. Yellow, 

 fading to white on the earlier whorls, the apex black, copiously 

 striped with purple-brown on the spire, olive on the last whorl, the 

 stripes simple or branching above ; the base with two wide blackish- 

 olive girdles and a reddish columellar area. Suture with either a 

 pale or red border. Aperture dark within ; lip blackish-brown, ex- 

 panded. Length 40, diam. 18-20. Length 30, diam. 16 mill. 



Palawan. 

 19. Group of A. sinistr alis. 



Elongate forms with convex whorls and rather dull coloring, char- 

 acteristic of northern Celebes. 



