165 



rapidly increasing whorls, base less abruptly attenuated, canal 

 shorter, costae fewer and stouter. AVhorls below the apex four, 

 costae slightly curved, rounded, about as wide as the interspaces, 

 16 on the penultimate whorl, obsolete or only faintly developed 

 -on the body whorl. 



Length, 19"5 : breadth, 8'5 ; length of aperture, 7 ; of canal, 3. 

 . Locality. — Upper beds at Muddy Creek {J. Dennant !). 



3. Pisania obliquecostata, sjjec. nov. Plate ix., fig. 7. 



Shell small, narrow-ovate, thick ; whorls five, slightly convex, 

 •strongly costated and lirate. Costae rather narrow, rounded, 

 high, distant, oblique, about eight to a whorl ; lirag stout, dis- 

 tant, four on the penultimate whorl, more or less tuberculated 

 on the costse. 



Aperture varicosely dilated ; six stout denticles within the 

 outer lip ; columella truncated by an oblique fold ; canal short, 

 .stout, a little oblique. 



Length, 7 ; breadth, 3 ; length of aperture and canal, 3'5. 



Locality/. — Upper beds at Muddy Creek. 



4. Pisania purpuroides, Johnston. Plate xi., fig. 6. 



Ricinula purpicroides, R. M. Johnston, Proc. Koy. Soc, Tas- 

 iQania for 1879, p. 33. 



Shell small, solid, obtusely and narrowly ovate. "Whorls six, 

 those of the spire obtusely angulated and bicarinated, with an 

 impressed suture, transversely costated, spirally lirate, and 

 finely cancellated between the costte. There are two strong 

 encircling carinae, one median and a second about midway to 

 the anterior suture, whilst a third, less prominent, is at the 

 posterior suture ; in the concave interspaces between the lirae 

 there are one, two, or three fine spiral threads. 



Last whorl moderately convex, with about seven equal and 

 equidistant stout lir^e, having about three threads in each in- 

 terspace. 



The costae (eleven on the penultimate and eight on the body 

 whorl) are raised into blunt nodulations at the points of inter- 

 section with the stouter lirae. 



Aperture narrowly ovate ; outer lip varicosely dilated be- 

 hind, slightly creuulated on the acute margin, and with seven 

 tooth-like ridges within ; inner lip spreading over the 

 columella and thinly continuous with the outer lip, with one 

 elongated plication near the posterior angulation and about 

 eight small irregular callosities thence to the point of the 

 pillar. Canal short, wide, oblique, and slightl}^ reverted. 



Length, 12 ; breadth, 6 ; length of aperture and canal, 7. 



Locality. — Table Cape, Tasmania (i^. Jf. Jolinstoii ! ); lower 

 beds at Muddy Creek. 



