Parti. PHILIPPINE LAND SHELLS BARTSCH. 27 



This species is at once distinguished from all the other Philippine 

 Amphidromi by its sulphur yellow color and by the fact that it is 

 variced. 



AMPHIDROMUS ROESELERI Mollendorff. 



Plate 13, figs. 1-3. 



Amphidromus roeseleri von Mollendorff, Nachr. Deut. Malak. Ges., vol. 



26, 1S94, pp. 210-211. 

 Amphidromus roeseleri Pulton, Ann. Mag. Nat. Hist., ser. 6, vol. 17, 1896, 



p. 75. 

 Amphidromus roeseleri Pilsbry, Man. Conch., vol. 13, 1900, p. 144. 



Shell elongate-ovate, white with a satiny luster. Whorls well 

 rounded, appressed at the summit, marked by numerous, very re- 

 tractive lines of growth and exceedingly fine, spiral striations. Su- 

 tures moderately impressed. Aperture auricular; outer lip expanded, 

 reflected and thickened at the edge; inner lip twisted and expanded 

 at its insertion where it joins the rather thick parietal callus and is 

 reflected over the narrow umbilicus. Inside of aperture and peri- 

 stome white. 



There are three specimens of this species Cat. No. 215576, U.S. 

 N.M., which were collected on Jolo Island, Philippines, by Lieut. Col. 

 Edgar A. Mearns. All of them have six whorls. They measure — 

 length, 46 mm.; diameter, 25 mm.; length, 47 mm.; diameter, 25.2 

 mm.; and length, 48 mm.; diameter, 28 mm., respectively. Von 

 MollendorfF's type comes from Sulu (=Jolo) Island. 



AMPHIDROMUS, species ? 



The United States National Museum contains a specimen, Cat. No. 

 215638, collected by Lieut. Col. Edgar A. Mearns, on Loran Island, 

 opposite the southern end of Ubian Island. This specimen is a dead, 

 badly worn individual, which without question belongs to the group 

 of chloris, but it is too poor to serve as the type of a distinct species. 



GROUP OF AMPHIDROMUS ENTOBAPTUS. 



The yellow Amphidromi of the Western Philippine Islands belong 

 to a distinct group, of which we may take the oldest described species, 

 Amphidromus entobaptus Dohrn, as the typical figure. This group 

 is distributed over Palawan, the Guyos group, the Calamianes to 

 Mindoro, splitting up into races on the various islands. I have recog- 

 nized A. entobaptus, A. e. viridofiavus, A. e. Mnapaneensis, A. e. 

 culionensis, A. e. coronensis, A. e. busuangensis, and A. mindoroensis. 

 Amphidromus entobaptus s. s. comes from Palawan, and A. virido- 

 fiavus from Malubutglubut Island, while the location of the rest will 

 easily be noted from the name, which is based upon the island of the 

 type-locality. 



