650 bartsch: classification of helicinidae 



is quite lost on the second turn back. The base is bright pale yellow 

 excepting a sharply limited brown zone which is about as broad as the 

 yellow zone that intervenes between this and the periphery. The in- 

 terior corresponds with the exterior in coloration, the peristome being 

 bright pale yellow. This species, which comes from the island of 

 Siargao, may be known as Geophorus siargaoensis n. sp. The type, Cat. 

 No. 184,929 has 5 whorls and measures; altitude, 7 mm.; greater 

 diameter, 13.2 mm. 



In the northeast portion of Mindanao, at Surigao, a small race of 

 this species occurs, which differs from Geophorus siargaoensis chiefly 

 in its lesser size, but also in having the basal brown band a little nearer 

 the periphery and not so sharply limited. This smaller race may be 

 known as Geophorus siargaoensis surigaoanus n. subsp. The type, Cat. 

 No. 302772, has 5.1 whorls and measures: altitude, 6.3 mm.; greater 

 diameter, 10.8 mm. 



Group B 



Shell large, broadly conic, without color bands 



Peripheral keel compressed. 



Operculum broadly oval ticaoensis Bartsch 



Operculum rhomboidal. 



Peripheral keel limited on the under side by a strongly incised line. 

 Middle whorls mustard yellow. 



All whorls mustard yellow tantalus tantalus Bartsch 



All whorls not mustard yellow, the last turns with a paler zone 



at the summit tantalus masbatensis Bartsch 



Middle whorls capucine orange. 



Last whorl pale capucine orange . tantalus palawanensis Bartsch 



Last whorl flesh colored tantalus mansalayanus Bartsch 



Peripheral keel not limited by an incised hne on the under 



side romhlonensis Bartsch 



Peripheral keel rounded agglutinans Sowerby 



Sowerby, in describing Helicina agglutinans, listed three varieties. 

 Of these, variety a comes from the island of Guimaras, variety b from 

 Bohol, and variety c from Panay. The name agglutinans Sowerby 

 has since been fixed upon variety c by Wagner. This is a large shell 

 which has a rounded peripheral keel, with the base somewhat inflated. 

 There is no depressed area between the periphery and the rest of the base. 

 The upper surface of the shell is uniformly bright yellow while the lower 

 has a narrow zone of yellow near the periphery, below which it is suffused 

 with reddish brown, this color shading gradually to yellow on the middle 



