30 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



AMPHIDROMUS ENTOBAPTUS LINAPACENSIS, new subspecies. 



Plate 16, figs. 1-3. 



Amphidromus entobaptus gracilis von Mollendorff, Abhand, Nat. Gesel. 

 Gorlitz, vol. 22, 1898, p. 148, nomen nudum. 



Shell elongate-ovate, varying in color from oil green through 

 Naples yellow, through canary yellow to almost white. The greenish 

 tints are usually confined to the early portion of the shell, the later 

 turns being yelloAv. The inside is always of a deeper shade than the 

 exterior. The peristome is white. The whorls are closely appressed 

 at the summit, marked by decidedly protractively slanting lines of 

 growth and exceedingly fine spiral striations. 



We have seen 142 specimens of this race, Cat. No. 215599, U.S.N.M., 

 from Malcochin Harbor, 450 feet altitude, on Linapacan Island, 25 

 of which taken at random give the following measurements : 



1 Type. 2 Largest. * Smallest. * Average. 



This race seems nearest to typical A. entobaptus, but is uniformly 

 more slender, and a greenish tint is much more apparent. 



