MICROSTELE. 147 



agrees with P. myoporincc Tate, which is possibly only a sinis- 

 tral form of P. pacifica, from which it differs in its narrow 

 elongate shape and flatter whorls. It may prove on compar- 

 ison of actual specimens conspecific with Chondrula lepidula 

 Ad. and Ang." (Tate}. 



This narrow, sinistral species seems quite distinct from, all 

 others except P. myoporincc, which I have not seen. Speci- 

 mens from Palm Creek, which may be taken as the type 

 locality, measure : 



Length 4.45, diam. 1.7, aperture 1.57 mm. ; 5% whorls. 



Length 4, diam. 1.7, aperture 1.3 mm. ; 5i/ 2 whorls. 



Genus MICROSTELE Boettger. 



Microstele BTTG., Bericht Senckenb. Nat. Ges., 1886, pp. 

 25, 26. Type by orig. designation Pupa noltei. 



Shell small (S 1 /^ to 4% mm.), rimate, turrited, with obtuse 

 apex, of (51/0 to 6) strongly convex whorls. Aperture ovate, 

 with reflected, internally thickened lip, terminations remote; 

 a small angular tubercle, deeply placed parietal and colu- 

 mellar lamella? and sometimes one or two immersed palatal 

 tubercles. 



Distribution, India and Ceylon, East and Southwest Africa; 

 Miocene of Europe. 



With the shape of shell and aperture like Pupoides, this 

 genus has teeth like Pupilla. In many genera of Pupillidae 

 there are species with and others without teeth ; but Micro- 

 stele is here considered generically distinct because Pupoides, 

 in all the continents, is remarkably uniform in characters of 

 the aperture. 



It may be inferred that the Microstele species are surviving 

 representatives of the ancestral stock which gave birth to 

 Pupoides. 



Two species from the Miocene of Europe are rather closely 

 related to M. muscerda of Ceylon. 



MICROSTELE WENZI (K. Fischer). Pupoides wenzi K. 

 FISCHER, Archiv f. Molluskenkunde, lii, 1920, p. 92, fig. 1. 

 WENZ, Senckenbergiaua, ii, June, 1920, p. 112, fig. 2. Upper 



