AMPHIDROMUS, GROUP VIII. 185 



b 1 . Peristome white , no noticeable groove at root of colu- 

 mella ; spire with longitudinal flames bisected by a me- 

 dian light line, or without markings. 



Group of A. xieiigensiS) p. 193. 



Groups of the East Indian Islands. 



a. A small nodule at the posterior angle of aperture, separated 

 from the outer lip by a groove. 



Group of A. contrarius, p. 210. 

 a 1 . No such nodule developed. 



b. Yellow, with two orange bands and usually 3 or 4 dark 

 bands; no flames; umbilicate, solid. . 



Group of A. Icevts, No. xvii. 



b 1 Elongate, umbilicate, more or less streaked, not banded ; 

 colors dull. Northern Celebes. 



Group of A. sinistralis, No. xix. 

 a . Flammulate, striped, or spotted in spiral series. 



c. Lip roseate or black ; no roseate umbilical tract ; 

 flames of spire when .present bisected by a light 

 spiral. Islands east of Java. 



Group of A. latestrigatus, p. 205. 



c 1 . Lip white ; spire with flames cut by a median light 

 girdle ; base generally with two dark zones. Java, 

 S. Celebes and islands southward. 



Group of A. porcettanus, p. 200. 



c 2 . Plain yellow or whitish, or with 2 spot-bands above 

 and 2 continuous bands below. Allor and Pura Is. 

 Group of A. inconstans, p. 209. 

 c s . Species of Java, Sumatra, Borneo and Paragua. 



Group of A. adamsi, No. xviii. 



8. Group of A. mouhoti. 



Eather small sinistral species with green-lineate or yellow cuticle, 

 the peristome pink, brown or purple. Siam to Annam. 



a. Shell whitish or yellow, the last whorl or more covered with 

 green lines. 



b. peristome pink. 



c. form narrow ; upper whorls often maculate with 

 brown. mouhoti, p. 186. 



