Tart 1. 



PHILIPPINE LAND SHELLS BARTSCH. 



35 



in turn, is followed by a narrow yellow zone anteriorly; a red area 

 surrounds the umbilical area and this is followed at its posterior 

 edge by a moderately broad yellow zone. The inside of the aperture 

 and lip are white. 



Cat. No. 66188, Philadelphia Academy of Natural Sciences, fig- 

 ured in Tryon's Manual of Conchology (vol. 13, pi. 71, fig. 78), is 

 typical quadrasi, it is my figure 3, on plate 12. This comes from 

 Balabac Island. It has a little more than six whorls and measures — 

 length, 34 mm.; diameter, 17.8 mm. Another specimen in Mr. 

 Webb's collection, which I have likewise figured (pi. 12, fig. 1), is 

 also typical quadrasi and comes from the same island. It has 6^ 

 whorls and measures — length, 36 mm. ; diameter, 18.2 mm. 



The United States National Museum has several lots of this form, 

 all obtained by the United States Bureau of Fisheries' Expedition 

 to the Philippine Islands, which I shall list in detail below. All of 

 these are remarkably uniform in coloration, the green streaks being 

 reduced to a minimum, the yellow predominating in every instance. 

 They all have white tips. 



Eighty-six specimens, Cat. No. 215603, U.S.N.M., were obtained 

 at Caxisigan Island, near Balabac Island. Twenty-five of these, 

 taken at random, give the following measurements : 



• Average. 



* Greatest. 



* Least. 



