129 



depressed, wavy threads, separated by linear interspaces (about 

 25 on penultimate whorl) ; a few indistinct undulations cross the 

 whorls. Last whorl very slightly convex, a little attenuated 

 and concavely depressed at the base, varicosely thickened behind 

 the aperture. Aperture elongate-oval, narrowed at the ends ; 

 canal narrow, open, a little bent to the left and upturned at the 

 front. Outer lip ascending a little at the suture, slightly arcuate, 

 the edge blunt. Columella a little twisted at the front with four 

 stout, oblique plaits, the second being the stoutest and the two- 

 posterior ones the smallest. 



Dimensions. — Total length, 9 ; breadth, 4; length of aperture, 6- 



Locality. — Lower beds at Muddy Creek. 



19. Voluta lintea, spec. nov. Plate iii., figs, la — b. 



Shell fusiform, narrow, thick ; pullus of two and a half whorls, 

 blunt and smooth at the top, the last half turn with slender 

 costpe. 



Whorls three and a half, rather iiat, faintly depressed medially, 

 with an impressed suture. Surface ornamented with numerous 

 slender, wavy threads, a little narrower than the interspaces. 

 Last whorl slightly convex, gradually attenuated to the moder- 

 ately long straight canal ; the posterior half with about eight 

 angular ridges, which are faintly tracea^ble from the suture to the 

 base, but are more conspicuous at the periphery. Aperture, 

 elongate-oval ; columella with four equi-distant and nearly equal 

 plaits. 



Dimensions. — Length, 26; breadth, 10*5; length of aperture, 17. 



Locality. — Calciferous sandstones of the River Murray Cliffs,, 

 near Morgan. 



20. Voluta cribrosa, spec. nov. Plate iii., fig. 8. 



Shell fusiform, with a moderately long spire ; pullus conical of 

 two and a half Avhorls, ending in an erect tip ; last half turn 

 narrow, flat, but slightly angulated and flattened at the suture. 



Whorls, three, slightly convex, more depressed behind than in 

 front ; ornamented with acute spiral threads (about 1 5 on the 

 penultimate whorl), slightly crenulated, the interspaces about 

 four times wider, crossed by curved, distant, slender, angular 

 lirse. Columella with equal and equi-distant plaits. 



i)^77ie?^s^07^s.— Length, 34 ; length of aperture, 20. 



Locality. — Turritella-clays, Blanche Point, Aldinga Bay. 



21. Voluta sarissa, spec. nov. Plate ii., figs. ia~h. 



Shell fusiformly turreted, moderately stout ; pullus of three and 

 a half to four whorls, conoidal-cylindric, smooth, the middle whorl 

 the highest and widest, the tip is exsert. 



Whorls six (excluding the pullus), flatly convex, ornamented 



I 



