58 MANGILIA. 



of denticulations -within the outer margin of the aperture and 

 the comparatively inconspicuous longitudinal costse, it might have 

 been included in the subgenus Cythara. 



Dimensions. — Length 10 mm.; breadth 4-5 mm. ; length of 

 aperture 6 mm. 



Form, and Loc. — Eocene (?) : Muddy Creek, Victoria. 



G. 4222. One specimen. Presented by John Demiant, Esq. 



Subgenus CYTHARA, Schumacher. 

 [EssaiNouv. Syst. Habit. Testaces, 1817, p. 245.] 



Shell elongate ; longitudinally costate ; aperture narrow ; outer 

 margin more or less denticulated within ; columellar border 

 striated. Typically the shell is columbelliform. 



Type. — Cythara striata, Schumacher. 



Mangilia (Cythara) glabra, sp. nov. 



[Plate III. Figs. \Qa-b.] 



Shell solid, narrow, elongate ; whorls four in number, obliquely 

 costellated, the costae being large, rounded, curved (especially near 

 the suture), equidistant, and extending over the suture, which is 

 much hidden in consequence ; between the ribs are several spiral 

 lineations. Aperture narrow, widening somewhat in the middle ; 

 outer margin thick, callous, obscurely denticulated within; sinus 

 deep, oblique, near the suture and bordered by a thick callosity; 

 columellar border covered, the callus being thick posteriorly; 

 columella excavated ; anterior canal short and truncated. 



It is closely allied to M. hicohr, Reeve, living in the seas 

 of IS'orthern Australia and the Philippines, but is narrower, whilst 

 tlie columella is excavated instead of being convex or sinuate. 

 More distantly it is related also to If. capillacea, Reeve, of the 

 same geographical regions. 



Dimensions. — Length ITS mm.; breadth 5 mm.; length of 

 aperture 6 mm. 



Form, and Loc. — Miocene (?) : Muddy Creek, Victoria. 



G. 4201. Slightly rolled specimens. 



Presented hy John Dennant, Fsq. 



