340 



BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



This is the large, comparatively pale, race that Von Mollendorff 

 states {Joe. cit.) comes from Ilocos Sur, Abra, Benguet, and Tiagan. 

 I suspect that Benguet as given by him is really Bangued in Abra 

 Province, which would make the distribution cited a compact and 

 not a discontinuous one. Our shells from Benguet represent a much 

 smaller race, upon which, had Von Mollendorff possessed specimens, 

 he would not have hesitated to bestow a name. 



Specimens examined. — The specimen figured, U.S.N.M. No. 312998, 

 was collected by Quadras on Mount Bulagao, Ilocos Sur, Luzon. It 

 has 4.5 whorls and measures: Height, 18.4 mm; greater diameter, 

 36.3 mm; lesser diameter, 27.5 mm. Two additional specimens, 

 U.S.N.M. No. 116332, collected by Cuming in " Luzon," have each 

 4.2 whorls. They measure : Height, 19.5 and 20 mm ; greater diam- 

 eter, 34.9, 35.6, and lesser diameter, 28.2, 27.4 mm, respectively. 



OBBA MARMORATA ECIJANA, new subspecies 



Plate 86, Figuke 1 



In this race the periphery of the last whorl is not strongly angu- 

 lated, but appears as a slender thread. The base is rather inflated 

 and well rounded. The shell is decidedly elevated and broadly conic. 

 The aperture is large and broadly oval. The wrinkles are strongly 

 developed both on the upper and basal surface. In size it approaches 

 Obba marmorcnta rizalana, but it can be at once distinguished from 

 that by its much more elevated spire and coarse wrinkled sculpture, 

 which is almost obsolete in Obba marmorata Hzalana. 



Tyjie. — U.S.N.M. No. 312996 has 5.1 whorls and measures: Height, 

 18.2 mm; greater diameter, 31.8 mm; lesser diameter, 24.7 mm. It 

 was collected at Lupao, Nueva Ecija, Luzon. 



Additional' ?naterial, — Four topotypes, U.S.N.M. No. 312997, yield 

 the following additional measurements: 



OBBA MARMORATA RIZALANA, new subspecies 



Plate 86, Figure 2 



This is a dark-colored race of depressed-helicoid shape. It belongs 

 to the group in which the periphery is not conspicuously angulated 



