SUBEMAEQINULA. 289 



closely-set compressed transverse granulations ; and the other 

 series being smaller, each rib alternating with those of the larger 

 series, these also are granulate, and are transversely scaly, the 

 latter ornament being due to small transverse ribs crossing them ; 

 lines of growth lead to slight rugosities on the surface ; margin 

 crenulated, the anterior and posterior portions are produced, the 

 middle slightly excavated ; fissure very short, but broad. 



It is of the same group as E. striatula, but the apex of the 

 latter is not so near the margin, and the margins of the New 

 Zealand shell are not so much excavated in the middle, whilst 

 the surface ornamentation is different. 



Dimensions. — Height 12 mm.; maximum breadth of base 

 16 mm. ; minimum breadth 12'5 mm. ; length of fissure 2 mm. 



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



G. 4167. The type specimen. Presented ly John Dennant, Esq. 



Genus SUBEMARGINULA, BlainviUe. 

 [Manuel de Malacologie, 1825, p. 501.] 

 Hemitoma, Swainson, Malacology, 1840, p. 356. 



Shell oval, conical, apex subcentral, directed posteriorly ; 

 surface radiately ribbed ; anal fissure when present, short ; 

 continued upwards as a groove in the interior, the rib formed 

 as the slit fills, with gi'owth, is not diS^erently ornamented to 

 the other ribs ; large muscle - scar in the interior, the ends of 

 wliich are curved inwards towards the cavity of the apex. 



Type. — Emarginula emarginata, BlainviUe. 



Subgenus TUGALIA, Gray. 

 [Guide Syst. dist. Moll. 1857, p. 1G3.] 



Shell typically elongate oblong, depressed, apex situated nearer 

 the posterior margin ; the anterior margin has no notch, fissure, 

 nor slit, and tliere is no internal anal groove. 



Type. — Tagalia elegans, Gray. 



