200 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 40. 



Webb collection, 1689; altitude, 22.7 mm.; diameter, 11.4 mm. Sibuyan. 



Webb collection, 1689; altitude, 24.0 mm.; diameter, 10.6 mm. Sibuyan. 



Webb collection, 1689; altitude, 25.6 mm.; diameter, 12.0 mm. Sibuyan. 



Webb collection, 1689; altitude, 25.5 mm.; diameter, 12.0 mm. Sibuyan. 



Webb collection, 1689; altitude, 23.5 mm.; diameter, 11.7 mm. Sibuyan. 



Webb collection, 1689; altitude, 24.5 mm.; diameter, 11.3 mm. Sibuyan. 



Webb collection, 1689; altitude, 24.0 mm.; diameter, 10.5 mm. Sibuyan. 



Webb collection, 1689; altitude, 21.7 mm.; diameter, 10.4 mm. Sibuyan. 



Webb collection, 1689; altitude, 21.9 mm.; diameter, 10.8 mm. Sibuyan. 

 Average, altitude, 23.05 mm.; diameter, 10.91 mm. 

 Greatest, altitude, 26.9 mm.; diameter, 12.3 mm. 

 Least, altitude, 22.1 mm.; diameter, 10.2 mm. 



SCHISTOLOMA (SCHISTOLOMA) ALTA PYGMAEA, new subspecies. 



This subspecies, of wliich wo have only a single specimen, the type 

 (Cat. No. 296608, U.S.N.AI.), comes from the Island of Romblon. 

 It has a brown lip and is much smaller than any of the other subspecies 

 so far noted, the measurements being: alt. 19.5 mm.; diam. 9 mm. 



SCHISTOLOMA (SCHISTOLOMA) McGREGORI Bartsch. 



Coptocheilus mcgregori Bartsch, Proc. U. S. Nat. Mus., a'oI. 37, pp. 298-299, 

 pi. 29, fig. 15, 1909. 



Shell elongate conic, chocolate brown, with the peristome rangmg 

 from flesh-colored to dark bro-^ai. Nuclear whorls a little more than 

 two, well rounded, apparently smooth, scarcely differentiated from 

 the succeeding turns; postnuclear whorls somewhat inflated, well 

 rounded, marked by decidedly retractive, rather strong, closely 

 spaced lines of gi'owth and irregularly distributed, fine, spiral striations 

 which are quite variable in strength. Sutures constricted; periphery 

 of the last whorl rounded ; base narrowly umbilicated, with or without 

 a slender fasciole. Aperture almost circukir, with a strong double 

 peristome which is strongly reflected, very regular, and in one plane. 

 The outer peristome is adnate to the base; the inner peristome bears 

 a strong notch at the junction of the columella and parietal wall. 



This species breaks up into tliree subspecies, as follows: 



SCHISTOLOMA (SCHISTOLOMA) McGREGORI McGREGORI Bartsch. 



Plate 51, figs. 2 and 4. 



Coptocheilus mcgregori Bartsch, Proc. U. S. Nat. Mus., vol. 37, pp. 298-299, 

 pi. 29, fig. 15, 1909. 



In this subspecies, which comes from Semarara Island, the peris- 

 tome varies from flesh-colored to light bro^vn. 

 Twenty-five specimens yield the following measm*ements : 



Cat. No. 205181, U.S.N.M.; altitude, 20.5 mm.; diameter, 9.5 mm. Semerara Id. 

 Cat. No. 205181, U.S.N.M.; altitude, 19.5 mm.; diameter, 9.0 mm. Semerara Id. 



