MAKGINELLA. OSJ 



"whorls convex, subangulate, body-whorl large, obscurely, irregu- 

 larly plicate at the periphery ; lines of growth inconspicuous, 

 except where the outer enamel is very thin ; suture well marked, 

 and between it and the peripheral subangulation is a broad, 

 smooth concavity ; aperture elongate, abruptly terminated at the 

 posterior end, somewhat inflated in the middle, and truncated 

 anteriorly, where there is a broad, oblique channel ; outer margin 

 thickened, bent over towards the aperture, crenulated throughout 

 its length except near the posterior extremity ; inner margin 

 callous, and bearing four large columellar plaits, the most anterior 

 of which borders the channel. 



In its general shape M. conica somewhat resembles II. goodalli, 

 Shy., though the former is much smaller. It has a near ally in 

 M. micula, Tate, from the Eocene of Muddy Creek, which, how- 

 ever, is a much smaller and broader form, with a less elevated spire. 



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

 aperture 5 mm. 



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



G. 9522. Several examples. W. B. B. Mantell Coll. 



Marginella (Glabella) micula, Tate. 



1878. ITargineUa micula, Tate, Trans. Phil. Soc. Adelaide, 1877-8, p. 93. 

 1889. MargincUa micula, Dennant, Trans. Roy. Soc. South Aust. vol. xi. 

 p. 43. 



Shell minute, smooth, conically ovate ; spire very short, composed 

 of one and a half whorls ; body- whorl comprehensive, subangulate 

 at the periphery and slightly concave between the shoulder and 

 the suture, which is covered over, growth-lines conspicuous with 

 the aid of a lens ; aperture elongate, abruptly terminating posteriorly 

 and deeply channelled anteriorly; outer margin minutely crenu- 

 lated, much thickened, the callosity bounding the posterior sinus 

 and extending over a great part of the surface of the body- whorl 

 in the vicinity of the columella ; inner margin callous, furnished 

 with four rather distant plications, the most anterior of which 

 borders part of the anterior channel. 



This species is allied to M. conica from the Tertiary of New 

 Zealand, as previously described. It has relationships, also, with 

 M. vitrea, Hinds, from the west coast of Africa, as mentioned 



