Amphidromus perversus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Camaenidae.

[3] Remarks: The problem of how to treat insular populations which show minor divergence from the main stocks is far from being satisfactorily settled.

Thus, the name butoti can at least be used for the color variation if it is decided to include the Kangean populations in the nominate form of perversus.

97806, and in Butot and the Zoologisch Museum, Amsterdam, Some additional material from Kangean Island (USNM 468416, Paravicini!)

Apparently it is a white derivative from the interruptus stock, which may have a definite geographic separation in Bali and Java.

Material from Kedewan, East Java (Butot, Chicago Natural History Museum 72404) ranged from 43.5 to 48 mm in height.

[3] Remarks: The purple apex, the numerous wavy brown flammulations that are partially interrupted by a yellow peripheral color band, and the solid shell are characteristic.

Amphidromus perversus natunensis is quite variable in color, ranging from white to dark (see Pilsbry 1900, pp. 162–163).

Of seventeen shells collected in May, 1954, by Hoogerwerf at Telaga Kastoba, Bawean Island, ten were dextral and seven sinistral.