OHLORITIS. — AMPHIDE0MU3. 177 



half a whorl more; the hair-scars, moreover, are much finer and 

 more crowded, while the presence of a supra-peripheral band, 

 although only a faint one, still further differentiates it from 

 G. anserina. 



Fig. 81. — Chloritis theobaldi. (From Proc. Malac. Soc. London.) 



A specimen in the Hungerford collection of the British Museum 

 I also refer to C. theobaldi. It is a trifle smaller than the type, 

 measuring 24 : 20 : 15 mm., and exhibits a very faint trace only of 

 the supra-peripheral band near the peristome. 



The two species approach C. francisccmomm, Gredler, a Chinese 

 form. C. theobaldi especially bears a striking resemblance, but 

 has the umbilicus a little more contracted, the spii-e is relatively 

 higher, and the aperture is less dilated laterally, while the 

 columellar margin ascends less obliquely ; the hair-scars are also 

 finer. 



Genus AMPHIDROMUS, Albers. 



Amphidromus, Albers, Die Heliceen, 1850, p. 138 (in part) ; Pfeiffer, 

 Malak. Bliitt. ii, 1856, p. 146 (in part) ; von Martens, Die Heliceen, 

 ed. 2, 1860, p. 184; ibid., Preuss. Exp. Ost-Asien, Zool. Theil, ii, 

 1867, pp. 77 & 332 ; Semper, Reisen, Arch. Philipp. 2te Theil, 

 vol. iii, 1877, p. 146 ; Fulton, A. M. N. H. ser. 6, xvii, 1890, p. 66 ; 

 Pilsbry, Man. Conch, ser. 2, xiii, 1900, p. 127. 



Type, Helix perversa, Linn. 



Range. India (Sylhet), Burma, Farther India, Malay Archipelago, 

 and Philippine Islands. 



" Shell of moderate size, dextral or sinistral, long-ovate, with 

 6-8 moderately convex whorls ; smooth (rarely ribbed) and light or 

 bright-colored, yellow predominating, often with green or brown 

 streaks, flames, or bands. Apical whorls smootli or obsoletely 

 pitted. Aperture somewhat oblique, ovate, not contracted by teeth 

 or folds ; peristome more or less thickened, expanded, or reflexed, 

 the columellar margin reflexed, with a very weak fold or none. 



"Jaw thin and weak, with flat ribs crenulating the edges. 

 Kadula with broad V-shaped rows, the teeth of ' arboreal ' type, 

 with the side cusps brought near the median cusp, all the cus[)s 

 broad ; outwai'dly the side cusps are split. Kidney extremely long 

 and narrow, with reflexed ureter and closed secondary ureter. 

 Genitalia of typically epiphallogonous structure; receptaculum 



