Fossil Fauna, Table Cape Beds, Tasmania. 121 



Di»ie7isioHS. — Length, 7 ram. ; breadth, 6 ram. ; breadth of 

 aperture, 3 mra. 



Locality. — Eocene beds of Table Cape, Tasmania. 



85. Delphinula imparigpanosa, sp. nov. Plate III., 

 figs. 8 and 9. 



Shell small, turbinate, convex basally, with a well-elevated 

 spire consisting of a few convex, coarsely granulose whorls, some- 

 what thick and strong, with a wide and deep umbilicus. 



Apical angle about seventy degrees. Embryo obtuse and 

 broad, being about two millimetres across, and consisting of 

 about two whorls, the second of which is distinctly angulose 

 close to the anterior suture, and carrying one spiral band of fine 

 granules between the angulation and the suture. Spire consists 

 of about three rapidly increasing convex whorls, with an ill- 

 defined suture. Aperture comparatively large and rouiid ; outer 

 lip thick internally, but thin at the extreme outer edge, and 

 slightly effuse at the four points where the four strongest spiral 

 ridges of granules of the body-whorl cease, much more sti'ongly 

 etluse at the posterior and anterior of the aperture ; inner lip 

 very thin and slightly reflected towards the umbilicus, regularly 

 arched on the aperture side, slightly biangulated by the presence 

 of two ridges on the umbilical side. Umbilicus very wide and 

 deep, only about half a millimetre narrower than the aperture, 

 and penetrating a considerable distance beyond the posterior 

 canal, and strongly margined by an acutely-angular granulose 

 ridge running round from the anterior canal and joining the 

 aperture as the second ridge below the suture. 



Surface ornamented with coarse and fine granulose spiral 

 ridges, traversed by ver}' fine transverse strife parallel to the 

 lines of growth. There are three strong unequal granulose 

 ridges to each whorl, the posterior i idge being made up of the 

 coarsest and as a consequence smallest number of granules ; the 

 succeeding or middle ridge carries closer, slightly smaller, and 

 thei'efore a larger number of granules, whilst those on the 

 anterior ridge are still finer and raore numerous. On the body- 

 whorl the strongest granules become almost angular nodulosities. 

 Further, between these variously granulose ridges thei^e is a still 

 finer intercalated one, with one or two even finer spiral threads 



