TRUNCATELLINA OF ABYSSINIA. 85 



Length 1.65, diani. 0.72 mm.; 6i/ 2 whorls. 



Loochoo Islands : Yoronjima, Osumi ; a variety at Hen- 

 tona, Kunchan (Hirase). Type 67624 A. N. S. P. 



Pupa insulivaga PILSBRY & HIRASE, Proc. A. N. S. Phila., 

 1904, p. 631. 



Like the Oligocene T. splendidula and a few Recent Euro- 

 pean and South African forms, this species lacks the rib- 

 striation common to most of the genus. In all other respects 

 it is a typical Truncatellina. The palatal tubercle cannot be 

 seen in an oblique view in the aperture, being unusually far 

 within, and as the shell is rather opaque in the type lot, it 

 was at first overlooked. 



It resembles T. uniarmata and various South African 

 species in having columellar and palatal teeth, but no parietal 

 lamella. 



Yoron Island, though politically belonging to Osumi Prov- 

 ince, lies near the northern end of Okinawa, and thus is one 

 of the central Loochoos. 



The specimens from Kunchan (northern Okinawa, the large 

 island of the central Loochoos) are mainly a little smaller, 

 some being quite short, the cylindric portion of only three 

 whorls (fig. 27), though others have four subequal whorls as 

 in the type lot. These specimens show the palatal tubercle as 

 a light spot on the outside. 



Length 1.65, diam. 0.7 mm. 



Length 1.45, diam. 0.7 mm.; 6 whorls (fig. 27). 



IV. SPECIES OP NORTHEAST AFRICA (ABYSSINIA). 



These forms seem about equally related to the rivierana- 

 claustraUs group of Europe and to the South African T. per- 

 plexa. 



1. Palatal, columellar and parietal teeth present 2. 



No palatal tooth ; columellar inconspicuous ; length 1% mm. 



T. blanfordi, no. 21. 



2. Palatal fold partially visible in a direct front view ; rather 



spaced riblets ; 1.5 mm. long, 5-6 whorls. T. lardea, no. 18. 



Palatal fold visible only in an oblique view in the mouth ; 



rib-striation close ; length 1.6 to 1.75 mm 3. 



