NO. 2104 LAND HHELLH OF THE G'B.Vf/.V t^CHLSTOLOMA—BARTHCII. 203 



SCmSTOLOMA (HOLOLOMA) QUADRASI Hidalgo. 



Megalomastoma quadrasi Hidalgo, Journ. Conchyl., vol. 37, p. 305, pi. 15, fig. 5, 



1889. 

 Coptochcilus quadrasi Kobelt and Mollendorfp, Nachrbl. Deut. Malak. Ges., 



vol. 29, p. 141, 1897. 

 Coptochilus quadrasi Mollendorff, Abh. Ges. Gorlitz, vol. 22, p. 186, 1898. 

 CoptocJiilus quadrasi rhodocJiilus Mollendorfp, Abh. Ges. Gorlitz, vol. 22, p. 186, 



1898 (nomen nudum). 

 Schistolovia quadrasi Das Tierreich, vol. 16, p. 280, 1902. 



Shell stout, subcylindric, rapidly tapering at the summit, chestnut 

 brown. Nuclear whorls not differentiated from the postnuclear 

 turns, apparently very finely pitted. This pitting, however, may be 

 due to erosion. Postnuclear whorls somewhat inflated, well rounded, 

 appressed at the summit, marked by very fine, slightly retractive, 

 closely spaced fines of growth and exceedingly fine, irregularly dis- 

 tributed, spiral striations. Sutures slightly impressed; periphery of 

 the last whorl well rounded; base moderately long, narrowly umbih- 

 cated, bearing on its middle a strong, raised spiral cord. Aperture 

 subcircular; peristome reflected, thick, wliite, adnate to the base 

 posteriorly. 



This species has been reported so far only from two islands, both 

 belonging to the Calanuanes group. They are Busuanga and Coron. 

 There is a difference in the size of the specimens occm'ring on these 

 two islands, so they may be considered as two distinct subspecies. 



SCHISTOLOMA (HOLOLOMA) QUADRASI QUADRASI Hidalgo. 



Plate 51, figs. 8 and 10. 



Megalomastoma quadrasi Hidalgo, Jomn. Conchyl., vol. 37, p. 305, pi. 15, fig. 5, 



1889. 

 Coptochcihis quadrasi Kobelt and Mollendorfp, Nachrbl. Deut. Malak. Ges., 



vol. 29, p. 141, 1897. 

 Coptochilus quadrasi Mollendorfp, Abh. Ges. Gorlitz, vol. 22, p. 186, 1898. 

 Schistoloma quadrasi Das Tierreich, vol. 16, p. 280, 1902. 



We have seen 125 specimens from Busuanga. Twenty-five of these, 

 taken at random, give the following measurements: 



Cat. No. 184579, U.S.N.M.; altitude, 20.1 mm.; diameter, 13 mm. Busuanga Id. 



(figured). 

 Cat. No. 184579, U.S.N.M.; altitude, 25.5 mm.; diameter, 12.5 mm. Busuanga Id. 

 Cat. No. 195735, U.S.N.M.; altitude, 24.6 mm.; diameter, 11.3 mm. Busuanga Id. 

 Cat. No. 195735, U.S.N.M.; altitude, 26.8 mm.; diameter, 13.4 mm. Busuanga Id. 

 Cat. No. 195735, U.S.N.M.; altitude, 27.4 mm.; diameter, 12.9 mm. Busuanga Id. 

 Cat. No. 195735, U.S.N.M.; altitude, 26.0 mm.; diameter, 12.4 mm. Busuanga Id. 

 Cat. No. 195735, U.S.N.M.; altitude, 26.0 mm.; diameter, 12.8 mm. Busuanga Id. 

 Cat. No. 195735, U.S.N.M.; altitude, 20. 3 mm.; diameter, 13.0 mm. Busuanga Id. 

 Webb collection; altitude, 25.4 mm.; diameter, 12.7 mm. Busuanga Id. 

 Webb collection; altitude, 27.2 mm.; diameter, 12.5 mm. Busuanga Id. 

 Webb collection; altitude, 26.0 nmi.; diameter, 13.0 mm. Busuanga Id. 

 Webb collection; altitude, 26.0 mm.; diameter, 12.5 mm. Busuanga Id. 



