bartsch: classification of heltcinidae 655 



{Schistopinax) siquijorensis n. sp. This species, which comes from the 

 island of Siquijor, is broadly conic and has a brown band on the base 

 near the periphery. The type, Cat. No. 195499, has 5.5 whorls and 

 measures: altitude, 7.5 mm.; greater diameter, 12.8 mm. 



The other two forms are much smaller and narrowly conic. Geo- 

 phorus (Schistopinax) trochiformis Sowerby comes from the island of 

 Negros. Wagner cites 4.5 whorls with an altitude of 5.5 mm. and a 

 major diameter of 6.5 mm. for the specimen he figures. He states and 

 shows that this is a little less elevated and has the last whorl a little less 

 rounded than Geophorus (Schistopinax) trochiformis suhtrochiformis 

 (Mollendorff) Wagner, which he describes from the island of Marin- 

 duque, and for which he gives the measurements: altitude, 5.5 mm.; 

 greater diameter, 7 mm. 



Diplopinax, new subgenus 



This subgenus is characterized by having the outer surface of the 

 operculum crossed by a lamella which divides the operculum into a 

 shallow, large labial portion and a strong pit at the columellar end. 

 Type: Geophorus (Diplopinax) taghiller anus Bsirtsch. 



Incised spiral lines present. 



Color band present on the base. 



Greater diameter more than 13 mm acutus PfeifTer 



Greater diameter less than 11 mm. 



albocarinatus (Mollendorff) Wagner 

 Color bands absent on the base. 



Greater diameter more than 17 mm bothropomus MoWendorfi 



Greater diameter less than 12 mm. 



Spire decidedly elevated conoidalis Mollendorff 



Spire decidedly depressed mollendorffi Bartsch 



Incised spiral lines absent. 

 Color bands present. 



Greater diameter more than 14 mm peracutissimus Wagner 



Greater diameter less than 13 mm. 



Interior suffused with red taghiUeranus Bartsch 



Interior not suffused with red cumingi Bartsch 



Color bands absent. 



Shell bfoadly conic lazarus Sowerby 



Shell narrowly conic duponanus Bartsch 



It is interesting to note that in none of the species so far knawn do 

 we find the junction of the columella and basal lip forming a decided 

 angle. The subgenus can be divided into two sections on the presence 

 or absence of fine incised spiral lines. 



