Parti. PHILIPPINE LAND SHELLS BAKTSCH. 23 



28 mm. ; and length, 46.4 mm. ; diameter, 25.5 mm., respectively. 

 They form Cat. No. 10G459 of the collection of the Philadelphia 

 Academy of Natural Sciences. 



AMPHIDROMUS BILATANENSIS, new species. 



Plate 10, figs. 4, 5. 



Amphidromus maculiferus, var. Smith, Ann. Mag. Nat. Hist., ser. 6, vol. 13, 



1894, p. 55, pi. 4, figs. 9, 9a, 

 Amphidromus maculiferus von Mollendorff, Nachr. Deut. Malak. Ges., 



vol. 26, 1894, p. 211. 



I have not seen specimens of this species, but base my conclusions 

 of its distinctiveness upon Mr. Smith's figures and remarks and the 

 geographical isolation from any of the other forms of the group. 

 I quote Mr. Smith's remarks : 



The specimens from Bilatan present but the faintest trace of oblique striga- 

 tion, like some of the Philippine examples. They more resemble the variety 

 figured by Hidalgo, being either pale lemon-yellow or pinkish white. They are 

 rather smaller than normal specimens, having an average length of about 

 50 to 55 millimeters. All as yet examined are sinistral. 



Hab., Bilatan Island. 



AMPHIDROMUS HIDALGOI, new species. 

 Plate 11, figs. 4, 6. 



Amphidromus maculiferus Sowerby, var. Hidalgo, Mem. Real Acad. Sci. 

 Madrid, 1898, pi. 99, figs. 1, 2. 



Shell large, inflated, the early whorls w 7 ith the usual narrow black 

 band immediately above the suture. The succeeding ones inflated, 

 appressed at the summit, lemon-yellow with a narrow whitish band 

 at the summit, and irregularly distributed markings of dark rust 

 brown. A varicial streak of the same color marks the last turn. 

 Aperture broad, flaring, strongly reflected; dark within, white at 

 the edge. 



I have based my description upon Senor Hidalgo's figures, 1 which 

 measure — length, 60 mm.; diameter, 35.5 mm. Sehor Hidalgo in- 

 forms me that the specimen came from Dapitan, Mindanao. 



AMPHIDROMUS CALISTA Pilsbry. 



Plate 11, figs. 1-3. 



Amphidromus chloris, col. var. purissimus Pilsbry, Man. Conch., vol. 13, 



1900, p. 144, pi. 50, fig. 32. 

 Amphidromus chloris, col. var. calista Pilsbry, Man. Conch., vol. 13, 1900, 



p. 144. pi. 50, fig. 36. 

 Amphidromus chloris, col. var. rosa Pilsbry, Man. Conch., vol. 13. 1900, 



p. 144. pi. 50, fig. 3S. 



iMem. Real Acad. Sci. Madrid, 1898, pi. 99, figs. 1, 2. 



