AMPHIDROMUS, GROUP XVIII. 229 



in good condition it is yellow at lower whorls, fading to white above ; 

 sometimes the lower whorls are ornamented with oblique narrow 

 pale green stripes, with a narrow orange band at the suture" (Fulton). 

 The locality given by Pfeiffer is "Malacca (F. W. Lindstedt) ;" 

 but if Fulton's identification of the species from Balabac Island is 

 correct, the original locality must have been mistaken. It has not 

 been confirmed by any later collector. I have not seen the species, 

 which may probably not prove specifically separable from A. quadrasi. 



A. QUADRASI Hidalgo. PI. 71, figs. 72-78. 



Shell sinistral, imperforate, oblong-conic, somewhat solid, rather 

 glossy and striatulate. 2^ later whorls yellow, densely covered with 

 green lines and streaks, with a carmine border below the suture and 

 patch encircling the columella, both usually bordered with clear 

 yellow ; the upper whorls and apex white or faintly pink tinted, 

 immaculate.. Aperture oblique, white within; peristome expanded, 

 white ; columella lilac tinted or white; parietal callus thin and trans- 

 parent. 



Length 35, diam. above aperture 15 mill, (type, fig. 77). 



Length 33^, diam. 17 mill. (fig. 78). 



Islet Candaramanes near Balabac (Quadras) and Balabac 1. 

 (Everett). 



A. quadrasi HIDALGO, Journ. de Conchy]. 1887, p. 3G, pi. 2, f. 



2; 1888, p. 33; Obras Malacologicas, pi. 101, f. 5, 6 (1900) 



SMITH, Ann. Mag. N. H. (6), xi, 1893, p. 350, pi. 18, f. 10 (typical 

 form), 11-13 (varieties) FULTON, Ann. Mag. 1896, p. 85; with 

 var. solida, p. 86, pi. 5, f. 16 -A. versicolor Fulton, torn. cit. p. 86. 

 A. dubius FULTON, t. c., p. 86, pi. 6, f. 1, 1 a HIDALGO, Obras, 

 pi. 101, f. 7, 8. A. everetti FULTON, t. c., p. 87 A. contrarius 

 Mull., HIDALGO, Journ. de Conchyl. 1888, p. 34. 



Close to certain Bornean forms of A. adamsi from which it may 

 be distinguished chiefly by the different color-patterns, green lines 

 on a yellow ground, with red at the suture and columella being 

 especially characteristic of the typical A. quadrasi. 



Mr. E. A. Smith described a number of color variations from 

 Balabac Island, his specimens having been collected by Alfred 

 Everett. Mr. Fulton has given a part of these specific rank ; but 

 having before me specimens received from Fulton, as well as a quan- 

 tity collected some years ago by Mr. J. B. Steere, I find that the 



