86 University of 3Iichigan 



duction : ovoviviparous ; eggs relatively very large, with a 

 white, granulate capsule. Eadula : very similar to that of 

 Opeas, but with multicuspid marginals. 



In this genus (see N. harterti), the inner laterals are tri- 

 cuspid and almost symmetrical, while the outer ones are re- 

 duced in size and slightly more tilted inwards ; in Leptinaria 

 (c/. Pilsbry; 1907; Man. Conch., XVII, fig. xli-4), the ento- 

 cone is very much reduced on the inner laterals, while the 

 outer ones are extremely elongate. Although the lingual 

 armature is known only in the typical group, I believe that 

 Neosubulina includes three subgenera : Pelatrinia Pilsbry (I. 

 c, p. 324), monotype Leptinaria helenae Pilsbry from Vene- 

 zuela; Neosubulina s. s. (redescribed above) from the Dutch 

 Leeward Islands; and Ischnocion Pilsbry (I.e.), monotype 

 Leptinaria triptyx Pilsbry from Colombia. In the first of 

 these, the shell is subacuminate-turrite ; the embryonic whorls 

 are vertically striate ; and only the columellar twist is present 

 in the adult. In the second, the shell is ovate-turrite ; the 

 embryonic shell is vertically and spirally striate ; and a spiral 

 lamella is present on the parietal wall of the adult. In the 

 third, the shell is subcylindric-turrite ; the embryonic whorls 

 are practically smooth ; and the adult develops a palatal fold 

 in addition to the columellar twist and the parietal lamella. 



Neosubulina liarterti Smith 

 (1898; Proc. Mai. S., Ill, p. 115, fig. II) ; collected by Hartert 



Type locality: Bonaire; probably near Kralendijk (Bl, 2). 



Distribution: Bonaire; in the richer localities (B3-6), 

 buried deeply in limestone talus. The species of this genus 

 inhabit the rotten mould that fills the deeper crevices of the 

 detritus ; they seldom occur among the cleaner rock fragments 

 near the surface, although the latter is the stratum where most 

 of the other genera were found. For this reason, it is very 

 difficult to estimate the abundance. 



Shell (fig. xvi-61) ; light horn-colored, quite transparent; 

 tapers quite regularly from last whorl to apex. "Wliorls: 9 

 (maximum observed) ; later whorls elongate, slightly and 



