32 PUPISOMA. 



above, but distinct on the base. They are rather distinct 

 throughout in the specimen figured from Bohol. They are 

 never so clearly cut as in some P. dioscoricola, but the least 

 striate dioscoricola are not distinguishable from many speci- 

 mens of orcula. 



Specimens (pi. 2, fig. 4) perhaps referable to P. pulvis- 

 culum are before me from Bohol, Quadras coll. They are 

 clean, light pinkish cinnamon-colored, finely and sharply 

 striate, larger striae at rather close intervals, and very dis- 

 tinctly striate spirally. Umbilicus about as in orcula. 



Alt. 1.6 to 1.65, diam. 1.55 mm. ; 3% whorls. 



Cebu specimens (pi. 2, fig. 3) are noticed below under P. 

 philippmicum, which appears to be merely orcula. 



1 1 In Natal the shells are found on the trunks, branches and 

 leaves of Cussonia and other native shrubs and trees in woods, 

 as well as on orange and apple trees in orchards." "Some- 

 times a distinct varix, showing a former resting-place, is 

 formed upon the shell" (Burnup). 



Mr. Burnup has pointed out that old shells become propor- 

 tionately higher for their diameter than younger. He gives 

 the following measurements of South African specimens 

 which seem mature : 



Alt. 1.57, diam. 1.75 mm. ; per cent of alt. to diam. 90. 



Alt. 1.62, diam. 1.88 mm. ; per cent of alt. to diam. 86. 



Alt. 2.00, diam. 1.74 mm. ; per cent of alt. to diam. 115. 



Alt. 2.18, diam. 1.94 mm. ; per cent of alt. to diam. 112. 



"Both this species and the following [P. japonicum] are 

 ovoviviparous, many of the specimens examined containing 

 one young mollusk furnished with a shell, and some few con- 

 taining two, one much larger than the other. ' ' 



PI. 2, fig. 2 represents a specimen from Maritzburg. 



This species is thought by Burnup to be an importation by 

 commerce ; yet as a similar form, perhaps identical, occurs in 

 Abyssinia, it may turn out to be one of the generally distrib- 

 uted East African snails, now known only at its northern 

 and southern limits. 



P. orcula appears to be so widely spread in the Oriental 

 Region and P. dioscoricola in the Neotropical that one hesi- 



