648 bartsch: classification of helicinidae 



comes from the island of Leyte, is a large form. The type, Cat. No. 

 184931, has 5.1 whorls and measures: altitude, 8.4 mm.; greater diame- 

 ter, 15.2 mm. 



The other banded form, Geophorus benguetanus, n. sp., is globose and 

 decidedly smaller. It comes from the mountains of the Benguet region, 

 Luzon. The type, Cat. No. 239871, has 4.5 whorls and measures: 

 altitude, 6.1 mm.; greater diameter, 9.4 mm. 



Of the five unhanded forms, the largest, Geophorus catainganus n. 

 sp., comes from Cataingan Bay on the island of Masbate. This is 

 well elevated and has the base quite convex and a strong depression 

 at the junction of the base and the peripheral keel. The type, Cat. No. 

 258768, has 5.1 whorls and measures: altitude, 9.5 mm.; greater diame- 

 ter, 14.2 mm. 



The two remaining forms are small species. Of these, one, Geophorus 

 trochulus Mollendorff, which comes from the island of Tablas, is decid- 

 edly elevated. A specimen of this. Cat. No. 195507, has 5.1 whorls 

 and measures: altitude, 6.2 mm.; greater diameter, 7.4 mm. 



The other species, Geophorus monticolus Mollendorff, is rather de- 

 pressed. A specimen, Cat. No. 184927, from Morong, Luzon, has 

 4.8 whorls and measures: altitude, 4.5 mm.; greater diameter, 6.4 mm 



Section III 



This group of Geophorus has no spirally incised lines. The columella 

 is excavated and forms a decided angle at its junction with the basal 

 lip. The shells thus characterized fall readily into three groups. 



Shell large, broadly conic. 



Shell with color bands Group A 



Shell without color bands Group B 



Shell small, narrowly conic Group C 



Group A 



Shell large, broadly conic, marked by color bands 



Shell decidedly elevated. 



The summit of the last whorl falling below the 

 strong peripheral keel and permitting this 



to show as a frill at the suture peracutus Wagner 



The summit of the last whorl not falling below the strong periph- 

 eral keel but appressed to it. 



Greater diameter of shell more than 12 mm leytensis Bartsch 



Greater diameter of shell less than 



12 mm leytensis hasiaoensis Bartsch 



Shell rather depressed. 



Greater diameter more than 13 mm siargaoensis Bartsch 



Greater diameter less than 11 mm... siargaoensis surigaoanus Bartsch 



