222 AMPHIDKOMUS, GROUP XVIII. 



and below the periphery, the latter enclosing a peripheral series of 

 squarish or long brown spots alternating with white intervals, which 

 appear above the suture on the spire ; a purple area surrounding the 

 columella; several early whorls and the apex white. Alt. 30, diam. 

 16, aperture 14^ mill. 



Islet between Bangney and Balambangan, Balabac Strait, N. E. 

 Borneo, on a tall tree (A. Adams). 



There is some pink color back of the lip in some specimens. The 

 figures in the zoology of the Samarang and iigs. 73 a, b of Reeve rep- 

 resent this form. My fig. 33 is also drawn from a specimen of the 

 original lot. 



In the same locality specimens (pi. G'.\ fig. 34) occur of a yellow 

 color, paler above, and with a yellow subsutural band but otherwise 

 bandkss ; the colnmellar patch and white apex as in the typical form. 

 Reeve's tigs. 73 c, d, represent this form. 



Color-varieties from Bangney Island. 



Form subunicolor Fulton (pi. G9, fig. 3~>). " Yellow ; lip, colu- 

 mella and umbilical area pink ; third and fourth whorls plain or 

 ornamented with a reticulated band just above (lie suture." In 

 specimens received from the author there is a broad white band above, 

 the apical whorls are pink, with sometimes a blackish terminal dot, 

 and the outer lip is white with a purple spot at the angle. Fulton 

 wrongly gives von Marten^ as the authority for the name. When 

 the spot band of the early whorls is continued upon the last, this 

 becomes 



Form articulates Fulton (pi. GO, fig. 3G). " Like tubunicolor, but 

 with a band composed of square dark-brown spots encircling the 

 periphery and continued at the suture of upper whorls ; ground-color 

 may be either yellow or reddish-brown." 



Form duplocinctus Fulton (pi. G9, figs. 37, 38). Ground-color 

 either yellow or reddish-brown, with two narrow purple-brown bands, 

 one peripheral, often showing above the suture on the spire, the other 

 on the base, generally split. Columella and area carmine, lip and 

 apical whorls pink. The brown form has a light-red subsutural bor- 

 der, and sometimes there are two series of brown spots on some early 

 whorls. 



Form simplex Fulton (pi. GO, fig. 44). "Ground-color lemon, 

 which is sometimes suffused with orange; a pink spiral band below 

 the suture ; upper whorls either plain or with some brown spots above 

 the suture of third and fourth whorls. Length 26, diam. 15 mill." 



