Australian Tertiary Pleurotomarias. 85 



Through the kindness of Mr. J. A. Kershaw, Curator of the 

 National Museum, Melbourne, and Mr. F. Chapman, Palaeontol- 

 ogist, I have been able to compare this specimen with McCoy's 

 type, and they agree with me that there is no doubt about their 

 specific identity. The preservation of the shelly material of Mr. 

 Cresswell's specimen is far better than that usually met with in 

 the limestones, casts and impressions being the most frequently 

 obtained under those conditions, consequently the sculpture can 

 be very distinctly and critically examined, and as there are 

 several points of difference from McCoy's figures and description, 

 it might be well to refer to them. The apical angle is practically 

 the same, being only a degree or two less, the whorls are slightly 

 convex above the band, depressed at the band, flat or slightly 

 concave below the band, earlier whorls rather flatter than later ; 

 the base is convex becoming depressed towards the periphery, it 

 is faintly spirally and radially striate, the latter marking being 

 somewhat sigmoid, the base is ;w/ umbilicate, but the columella 

 is strong and twisted ; aperture quadrate ; the band is about 1.5 

 mm. wide on a whorl of 14 mm. width ; strong spiral threads 

 irregular in width occur on the earlier whorls, but gradually fade 

 out till they become mere striations, there is usually one less 

 above the band than below it and they increase in number as the 

 whorls increase ; the arched striae crossing the spiral threads are 

 strongest near the posterior suture and their general trend is at 

 a much more acute angle to the band than the much fainter 

 striae below the band ; the earlier whorls from this sculpture 

 show quite a tessellation, but this disappears before the body 

 whorl is reached. McCoy's enlargement of the sculpture shows 

 12 threads above the band and 12 below, but the type does not 

 show this, there being actually fewer, and also a difference of one 

 above and below the band, nor is the tesselation as regular as 

 figured, while the arched striae in figure 1 are entirely erroneous. 



II. — Pleupotomapia bassi, sp. nov. (PI. XIII., Figs. 1, 2). 



Recently I obtained a very large specimen of this genus from 

 the Eocene beds of Table Cape, Tasmania, and though not very 

 perfect, through weathering of portion of one side, there appears 

 sufficient character to distinguish it as a new species. 



