102 Proceedings of the Royal Society of Victoria. 



becoming more convex anteriorly. Aperture elongate oval, some- 

 what effuse anteriorly, acute posteriorly, and with a short and 

 very broad anterior canal. Outer lip thickened at the edge, 

 slightly reflected outwardly and gently rounded off from within, 

 ascending the penultimate whorl for a short distance, but barely 

 reaching as high as the middle of that whorl. Outer lip has a 

 fairly regular, convexly arched slope to the anterior canal, which 

 it joins a little higher up than the opposite end of the columellar 

 side. Inner lip thickest near the suture, where it forms a 

 thickish enamel coating thirming out towards the columella. 

 Columella compai-atively long and slender, slightly twisted, and 

 bearing at its upper part three strongly oblique plaits decreasing 

 in strength posteriorly. 



Earlier whorls ornamented with from about fifteen to twenty- 

 five fine spiral threads, with narrower interspaces, the threads 

 being stronger in the neighbourhood of the sutures than at the 

 middle of the whorls, ultimately becoming obsolete anteriorly. 

 The spiral ornament is crossed transvei-sely by tine, close, and 

 regular strife parallel to the lines of growth, becoming more 

 distinct as the spiral threads weaken and vanish. Body-whorl 

 with very numerous strije and slight undulations parallel to the 

 lines of growth. 



Dimensions — Length, 16-3 mm.; breadth, 67 mm.; length of 

 aperture, 87 mm. ; breadth of aperture, 40 mm. ; breadth of 

 anterior notch, 20 mm. The Table Cape representative in the 

 present collection is a younger shell and has only attained the 

 length of 110 mm. Young examples of this species are not at all 

 uncommon, many examples of about 60 mm. in length and less 

 being easily obtained at some of our Victorian localities. Taking 

 the length as 100, the relative breadth varies fi'om about 37 to 

 45, the latter being the above large example. 



Locality. — Eocene beds of Table Cape, Tasmania. Conniion in 

 the lower eocene beds at Spring Creek, near ({eelong, also in the 

 eocene clays of Curlewis, Bellarine Peninsula, Victoria. 



Observations. — One of the adult specimens I have from Spring 

 Creek, though very much the same as the above, still shows a few 

 important chanicters wliich at present seem to warrant its recog- 

 nition at least as a varietal form. Some of the principal features 

 of this form being that the spire-whorls are a little more convex, 



