162 AMPHIDROMUS, GROUP VI. 



the banded form. Singapore (Friedel), with the band obsolete. 

 Mt. Tchbra and Mt. Tchehel, Perak (de Morgan). 



Bulimus citrinus, in part, REEVE, Conch. Icon. pi. 31, f. 187 a 

 (1848) ADAMS & REEVE Zool. Samarang, moll., p. 58, pi. 14, f. 

 11, living animal (1850). Bulimus inversus var. ft and / PFR., 

 Zeitschr. f. Mai. 1849, p. 133 Bulimus melanomma PFR., Zeitschr. 

 f. Mai. 1852, p. 95; Monograph ia iii, p. 310; iv, 374; vi, 19; viii, 

 24; Conchyl. Cab. p. 135, pi. 39, f. 28, 29 (type); pi. 41, f. 1, 2, 

 7, 8 MARTEN'S, Ostas. Landschn. p. 340. Amphidromus melan- 

 omma DE MORGAN, Bull. Soc. Zool. de France pour 1885, p. 387. 

 MLLDFF., P. Z. S. 1891, p. 336. A. perver&us var. melanomma 

 FULTON, Ann. Mag. N. H. (6), xvii, p. 68 (1896). 



From Singapore as a center, this variety has been traced north- 

 ward to Perak and southward to an islet off the coast of Biliton I., 

 if what A. Adams collected there was really melanomma. The 

 habitats "Moluccas," "Celebes" and "Sarawak, Borneo," require 

 confirmation. 



The recurved edge of the lip does not completely envelop the 

 back of the reflection as is usual in interruptus, and it has no dark 

 line at the extreme edge; the whorls are ordinarily more convex, 

 and the last one is perceptibly concave below the suture. Moreover, 

 the heavily streaked color pattern seems constant in A. melanomma. 

 and the ground color is rarely if ev'er so yellow. A. interruptus form 

 strigosus Martens resembles some specimens of melanomma, but it 

 has the straight-sided spire and adnate outer lip of interruptus. 



The name melanomma, black-eye, refers to the deep purple apical 

 spot, which is rarely replaced by a white apex. 



Figures 80, 81 are Pfeiffer's type. Fig. 83 is a very dark speci- 

 men from Singapore. 



Var. natunensis Fulton. PI. 55, figs. 87, 88, 89, 90. 



A large form, depressed below the sutures and with white-edged 

 lip, which is imperfectly or not at all adnate, as in melanomma; the 

 apex either purple or white. Color various: (1) " Entirely white, 

 generally with one or more oblique brown stripes or varices. (2) 

 White below the suture in the last two whorls, closely striped be- 

 neath with rich brown, often pinkish towards the apex. (3) Yellow 

 but with a broad white zone below the suture, with or without one 

 or two oblique brown varices," or with sparse chestnut streaks. 



