117 



.strong oblique plaits, the anterior one of which at the junc- 

 tion with the snout, is the largest, and is somewhat decurrent 

 on the relatively short, slightly bent, and open canal. 



Dimensions. — Length, 42 ; breadth, 17 ; length of aperture 

 :and canal, 28. 



Locality. — Lower beds at Muddy Creek {J. Dennant). 



This species differs from all those previously described by its 

 rounded whorls without costse or tubercles, and has no analogue 

 among recent forms. 



Peristernia Murrayana, Tate. Figured herewith, Plate iv., fig. 4. 



Peristernia pumila, spec. nov. Plate viii., fig. 4. 



Shell fusiform, with a short subscalar spire, ending in a small 

 mamillate apex of one and a half smooth convex whorls. 



Whorls four (excluding apical one), a little flattened in front 

 of the suture, with nine stout plications to each whorl ; plicae 

 narrowly rounded, high, elevated into blunt tuberculations at 

 the shoulder. Surface smooth, shining, ornamented with a few 

 ■distant incised spiral lines. 



Last whorl flatly rounded in the middle, where the plicse fade 

 away, thence abruptly contracted into a very short straight beak. 

 Aperture oval-oblong ; outer lip thin, smooth within ; columella 

 Avith three strong oblique folds ; canal very short, open, straight, 

 a little reverted at the tip. 



Dimensions. — Length, 4-75; breadth, 2-25; length of aperture 

 and canal, 2. 



Locality. — Clayey green sands, Adelaide bore. 



By its very short canal this species bears a general resemblance 

 to P. ajncilirata and P. actinostephes, from which it differs in 

 its smooth pullus and tabulate whorls. 



Eburnopsis, oren. nov. 

 It is with some diffidence that I establish a new genus for the 

 reception of the following species, which has the general aspect of 

 Ehurna ; but unlike all known species of that genus, it is spirally 

 ribbed and wants the callous structure of the inner lip and 

 umbilical region; moreover, the truncated columella, with its 

 Bubtuberculated extremity, is unknown in Ehiirna. The generic 

 name indicates its affinity with Ehurna. 



Euburnopsis aulacoessa, s^ec. nov. Plate iv., fig. 3. 



Shell ovately globose, spire very short, ending in a moderately 

 large globose pullus. 



Ordinary whorls three, narrow, deeply channelled at the suture, 

 the shoulder sharp-edged and strongly defined. Ornamented 

 with moderately elevated, rounded spiral ribs (six on the 

 penultimate whorl), a little narrower than the somewhat concave 



