88 MARGINELLA. 



the columellar region, columella with four distinct plaits, the 

 three anterior ones close together, the remaining (posterior) plait 

 usually being smaller and less oblique. 



This fossil form is more solid than are typical examples of the 

 species in the living state from Australia, as represented in the 

 Museum. 



Dimensions. — Length 1 1 mm. ; breadth 7 mm. ; length of 

 aperture 9 mm. 



Form, and Loc. — Post-Pliocene : Limestone Creek, Glenelg river, 

 Yictoria. 



G. 5559. Several specimens illustrating later stages of growth. 



Purchased. 



Marginella (Glabella) ovata, sp. nov. 



[Plate IV. Figs. 6a-5.] 



Shell small, solid, ovate ; protoconch smooth, obtuse ; spire 

 short, conical, composed of two slightly convex whorls ; body- 

 whorl large, ornamented by obscure, irregular, longitudinal folds, 

 especially well developed at the peripheiy; suture obscurely 

 marginate; aperture narrow, elongate, posterior sinus small, curved, 

 anterior broad, deep, and oblique ; outer margin thickened, not 

 crenulated ; columellar margin with four conspicuous plaits, the 

 most anterior of which borders the channel. 



This species differs from all other Australasian Marginellm here 

 described, by its solidity, ovate form, and truncated anterior sinus, 

 together with its veiy short and conical spire. 



Dimensions. — Length 7 mm.; breadth 4*5 mm. ; length of 

 aperture 5'5 mm. 



Form, and Loc. — Miocene : Parimoa, New Zealand. 



G. 9522. A number of examples of the adult. 



W. B. D. Mantell Coll. 



Marginella (Glabella) conica, sp. nov. 



[Plate IV. Figs. ?«-*.] 



Shell small, solid, volutiform, smooth ; spire short, conical ; 

 protoconcb obtuse, semi-transparent, with one and a haK turns; 



