PHOTINULA. 427 



given by Poli, to be bifid, the side-membrane crenated, 

 and the operculigerous lobe furnished with three tenta- 

 cular filaments on each side. The outer lip of the shell 

 is acute, and the umbilical region is not surrounded by 

 a spiral callus ending in a point, as in Chlorostoma. 



Species of Oxy stele. 



Adelaidse, Phil. sagittifera, Lam. 



fasciata, Anton. sauciata, Koch. 



fulgurata, Phil. Saulcyi, D'Orb. 



impervia, Mkc. suavis, Phil. 



indecora, Phil. tabularis, Krauss. 



ujerula, Chem. tenera, Trosch. 



meruloides, Krauss. tigrina, Chem. 



perdix, Koch. variegata, Anton. 



Genus PHOTINULA, H. and A. Adams. 



Shell orbicular, depressed ; whorls smooth, polished, 

 usually transversely lineated, umbilical region covered 

 with an impressed callus; aperture wide; inner lip con- 

 vex, thick, ending in a simple point. 



Syn. Margarita, sp. Aiict. Photina, H. and A. Adams 

 (olim), not Burmeister. 



E.x. P. caerulescens, Kuig, pi. 48, fig. 9. Operculum, 

 P. caerulescens, fig. 9, a, 9, h. 



This genus includes a small group of shells usually con- 

 sidered as species of MargarUa, but which approach still 

 nearer to the Ory.sfcle of Philippi ; the axis is imperforate, 

 the inner lip is not acute, and the whorls are lineated and 

 smooth. 



