Species o/Amphidromus, Albers. 77 



so dark as to hide the characteristic forked markings. Mar- 

 tens's virescens is simply furcillatus in good condition. The 

 narrow sutural band is yellow in most specimens, but some- 

 times of a pink colour. 



A. furcillatus, var. andamanica (Thorpe, MSS.), Hanley and 

 Theobald, Con. Ind. 1876, pi. cxlviii. fig. 10. 

 =andamanicus, var. nicobarica, Godwin- Austen, P. Z. S. 1895, p. 450. 



Loc. Andaman Islands ; Katchall, Nicobar Islands. 



Near furcillatus, but the markings on the last whorl are 

 not forked, and the narrow sutural band is reddish brown, not 

 yellow, as in most specimens of furcillatus. The var. 

 nicobarica, Godw.-Austen, is founded upon a light-coloured 

 specimen ; but specimens of andamanicus vary from very 

 light to quite a dark colour. 



Group of A. contrarius. 



24. A. poecilochroa (Boettger, MSS.), Fulton. (PI. VI. 

 fig. 7.) 



Loc. Sumbavva Island. 



Shell sinistral, ovate-conic, thin, obliquely striate, shining, 

 almost or quite imperforate, lemon-colour, with oblique dark 

 brown stripes, which are interrupted by a spiral yellow band ; 

 lower part of last whorl encircled by three dark brown bands, 

 which are separated by two other bands, the lower broad and 

 light red, the upper narrow and of a yellow colour ; whorls 6, 

 slightly convex ; columella thin, straight ; lip slightly ex- 

 panded, flesh-coloured. 



Long. 35 millim., maj. diam. 19 millim. 



At first I thought this to be the typical contrarius as figured 

 in Chemnitz, which figure (except for its thin columella) it 

 very much resembles. After sending specimens to Copen- 

 hagen for comparison with Muller's type, I find that the 

 generally accepted form of contrarius is the true one, a good 

 figure of which appears in the ' Voy. au Pole Sud ' by Homb. 

 & Jacq. pi. viii. fig. 1, and that poscilochroa is distinct from 

 that species. 



25. A. contrarius, Miiller, Hist. Verm. ii. p. 95. no. 292. 



=H. interrupta-sinistrorsa, Cliem. vol. ix. figs. 938, 939. 

 =intemq>tus, Homb. et Jacq. Voy. au Pole Sud, pi. viii. fig. 1. 



Loc. Timor Island. 



This species varies greatly in form, but can be distill- 



