Parti. PHILIPPINE LAND SHELLS BABTSCH. 19 



This shell somewhat resembles Amphidromus maculiferus gracilior 

 Fulton, but the hydrophanous markings are considerably less strong 

 in the present form, and it is much smaller and has a faint yellowish 

 suffusion. 



AMPHIDROMUS MALINDANGENSIS, new species. 



Plate 9, figs. 1, 2. 



Shell of medium size, elongate-ovate, dextral or sinistral, yellow 

 with bands of brown. The suture of the first two whorls is bor- 

 dered by a narrow black zone. The brown markings consist of 

 rather irregularly placed longitudinal bands which extend only over 

 the anterior two-thirds of the whorls between the sutures on the first 

 two and a half whorls. These bands are of quite regular widths 

 snd about half as wide as the spaces that separate them. On the 

 last turn the brown bands are irregular in width and assume a 

 decidedly zigzag form, but not a regular definite pattern. They 

 extend over the base to the umbilical area. The whorls are evenly 

 rounded, separated by a moderately constricted suture, and are 

 marked by exceedingly fine lines of growth. Aperture moderately 

 large ; outer lip thickened and reflected ; inner lip somewhat curved, 

 strong, and slightly twisted, reflected over the narrow umbilicus; 

 parietal wall covered with a moderately thick callus; inside of shell, 

 lip and callus white. 



Two specimens of this species are before us, Cat. No. 244689, 

 U.S.N.M. They were collected by Lieut. Col. Edgar A. Mearns at 

 Mount Malindang, Mindanao, at an altitude of between 3,500 and 

 0,200 feet, Both have six whorls, the sinistral specimen, the type, 

 measures — length, 48.5 mm. ; greater diameter, 25 mm. The dextral — 

 length, 46.8 mm. ; greater diameter, 27.5 mm. 



AMPHIDROMUS APOENSIS, new species. 



Plate 9, figs. 5, 6. 



Shell elongate-ovate, with the whorls moderately rounded and 

 appressed at the summit, marked by fine lines of growth only. The 

 first two volutions show the narrow black band in the suture, the 

 remainder of these whorls being yellowish-white. The next turn is 

 plain white. Beginning with the third, a series of closely spaced, 

 somewhat retractively slanting zigzag markings of alternating brown 

 and yellowish-white bands, the latter a little wider than the brown 

 elements, make their appearance. These brown bands become a lit- 

 tle more closety spaced on the last volution, particularly so on the 

 base. Aperture moderately large; outer lip thin, showing the ex- 

 ternal markings within, thickened at the edge, which is reflected 



