654 bartsch: classification of helicinidae 



the junction of the columella and basal lip is rather small. It is repre- 

 sented at present by four forms only, coming from the islands of Luzon, 

 Pagbilao, and Bohol. One of these three forms has color bands. The 

 largest, Geophorus acutissimus Sowerby, comes from the island of Bohol. 

 In this, all but the last turn are pale yellow, the last is flesh-colored. 

 There is a zone of rose pink at the summit and an equal one near the 

 peripheral keel. A third cone about twice as wide as these is on the 

 base separated from the peripheral keel by a narrow light zone. On the 

 inside of the aperture these red bands are almost scarlet. A cotype, 

 of this species, Cat. No. 104415, collected by Cuming, has 5 whorls and 

 measures: altitude, 9 mm., greater diameter, 16.7 mm. 



Of the three unbanded forms of this section one, Geophorus palananus 

 n. subsp., is of medium size, broadly conic, and of quite uniform honey, 

 yellow. The sculpture of the upper surface is much coarser than in the 

 preceding. This race comes from Palanan, Isabela Province, Luzon. 

 The type. Cat. No. 302787, has 5 whorls and measures: altitude, 6.3 

 mm.; greater diameter, 9.9 mm. 



Two of the races have a decidedly elevated narrow conic shell. One 

 of these, Geophorus perezi, n. sp., comes from the greater Pabgilao Island, 

 off southwestern Luzon. This is a small form in which the operculum 

 is very broad and bears a decided knob at the posterior columellar 

 border. The type. Cat. No. 310058, has 5 whorls and measures: alti- 

 tude, 5,2 mm.; diameter, 7.6 mm. The other, Geophorus caramoanus 

 n. sp., comes from Caramoan on the south end of the Caramoan penin- 

 sula in Ambos Camarines, Luzon. This has the shell a little more ele- 

 vated than G. perezi Bartsch, with the operculum much narrower and 

 with a tooth on the posterior columellar end of it. The type. Cat. No. 

 195504, has 5 whorls and measures: altitude 5 mm.; greater diameter, 6.8 

 mm. 



Schistopinax, new subgenus 



In this subgenus, the columellar border is thickened into a strong 

 knob at the parietal edge on the outside, which is limited anteriorly by 

 a deeply incised groove. 



Greater diameter more than 12 mm siquijorensis Bartsch 



Greater diameter less than 8 mm. 



Last whorl moderately rounded trochiformis Sowerby 



Last whorl very strongly rounded 



trochiformis subtrochiformis (MoUendorff) Wagner 



Of this subgenus I know only three forms and of these only one from 

 personal examination; namely, the type of the subgenus, Geophorus 



