OF SOUTHERN INDIA. 103 
XXI. MITREOLA, Swainson, 1840. 
(Vide Adams’ Genera, I, p, 174.-Chenw’s Manual, I, p. 194). 
The recent species of this genus are through their thickened form of shell, 
occasionally obsolete transverse ribbings and specially through the papillar structure 
of the apex, closely allied to the vozvrm.; and as the outer lip is sometimes thickened 
internally about the middle of its extent, it is difficult to distinguish them from 
Eneta by any other character than the stronger posterior plaits of the inner lip. 
We refer to this genus the Voluta citharina of Forbes on the ground of the 
last-named characteristic of the columellar plaits. — 
1. MUITREOLA CITHARINA, Forbes, sp. Pl. IX, Fig. 14, 
1846. Voluta citharina, Forbes, Trans. Geol. Soc., Lond. VII, p. 132, Pl, 12, Fig. 8. 
idem, D’Orbigny, Gabb, Pictet, etc. 
Mit. testa subfusiformi, ovata, ultimo anfractu spira im altitudine vix longiore ; 
anfractibus subconvexis, ad suturam subangulatis, transversim multicostulatis, spiraliter 
striatis, costulis prope rectis acutisque, una stria prope suturam fortiore atque sulco 
lato ceteris sejuncta ; labio antice quadriplicato. 
ho 
Spiral angle 45°; sutural angle 7°. 
Besides the elongated ovate form of the shell, the spire being about or very 
nearly as high as the last whorl, the principal character of this species lies in the 
ornamentation. There being between 18 and 20 transverse ribs present, slightly 
curved, sharp, crossed by numerous spiral, flat strize of equal strength on the ribs 
as well as in the furrows separating them. On the posterior margin of each whorl 
next to the suture there is a slight swelling and to this follows one of the strize 
markedly stronger than all others, and bounded on each side by somewhat broader 
sulcations; this produces a slight edge near the suture. The aperture is very nar- 
row; the inner lip exposes anteriorly four distinctly oblique folds, placed closely 
to each other and gradually becoming thinner towards the anterior canal. This last 
character combined with the total form of the massive shell induces us to place the 
species rather under the mzrriv than in the vozurrv%, where it has up to this been 
classed. We have seen only fragmentary specimens belonging to the Madras 
Museum; they are in a blueish calcareous sandstone, such as the mineralogical 
character of the Pondicherry fossils usually exhibits. 
Locality.—Pondicherry. 
Formation.—Valudayur or Arrialoor group. ( ? ) 
