SOLA.EIELLA. 283 



Genus SOLARIELLA, S. Wood. 

 [Ann. Mag. Nat. Hist. vol. ix. 1842, p. 531.] 



Shell tliin, nacreous, commonly and typically widely umbilicate, 

 the umbilicus being keeled and crenulate on the margin ; 

 ornamented by spiral threads which are sometimes granulate ; 

 aperture subangular. 



Type. — Solariella rnaculata, S. Wood. 



Solariella strigata, Tenison-Woods (sp.). 



1879. Miiiolia siriffata, Tenison- Woods, Proc. Linn. Soc. N.S.'NY. vol. iii. 



p. 235, pi. sxi. fig. 7. 

 1893. Eumargarita strigata, Tate and Dennant, Trans. Roy. Soc. South 



Aust. vol. svii. pt. 1, p. 223. 

 189-1. Etanargurita [Solariella) strlgata, Tate, Journ. Roy. Soc. N.S.^y. 



vol. sxra. p. 185. 



Shell turbinate, nacreous, spire elevated, composed of five or 

 six convex whorls, which are flattened near the suture posteriorly, 

 the flat area being bounded by a crenulated spiral carina ; beyond 

 this are two other peripheral carinse, and the whole surface of the 

 whorls has smaller spiral threads, including the convex base of 

 the last whorl; aperture entire, subquadrate ; umbilicus very 

 wide, spirally and longitudinally lineate, bordered by a sharply 

 crenulate keel. 



Dimensions. — Length 5 mm. ; breadth 7 mm. 



Form, and Loc. — Eocene: Muddy Creek, Victoria. 



G. 4173. A series including various stages of growth. 



Presented hy John Dennant, Esq. 



G. 9466. Several examples. Purchased. 



Family DELPHIlS'ULIDiE. 



Genus LIOTIA, Gray. 



[Proc. Zool. Soc. 1847, p. 145.] 



Shell umbilicate, solid, globose or discoidal ; whorls convex, 

 ornamented by trellised elevations, or merely longitudinal ribs; 



