158 



iribbed ; wTiorls below apex four, convex, bicarinated medially, 

 transversely costated. 



Cost» thick, seven or eight to a whorl, distant, raised into 

 blunt tubercles on the keels, faintly continued on to the base 

 •of the last whorl. Spiral ornament consists of two strong 

 medial threads forming keels, a slender thread on the posterior 

 slope, and one or two at the front of the spire whorls ; the 

 \whole surface crossed by curved striae of growth. 



Aperture oval; outer lip thin; columella obliquely trun- 

 cated by a spiral plait ; canal very short, wide, curved, and 

 reverted. 



Length, 5 ; breadth, 2 ; length of aperture and canal, 2. 



Localities. — Turritella clays at Blanche Point, Aldinga Bay; 

 clayey-green sands, Adelaide bore. 



11. Peristernia actinostephes, spec.nov. Plate ix., fig. 10. 



Similar to P. apiciliraia ; whorls below apex five, regularly 

 • convex, with thick humpy costas, about nine to a whorl, with 

 equal, equidistant spiral threads (six on the penultimate 

 w'horl). Outer lip smooth or lirate within ; base a little more 

 contracted. Aperture oblong. 



Length, 7 ; breadth, 2*5 ; length of canal and aperture, 3. 



Localities. — Same as the last. 



12. Peristernia succincta, T. Woods. 



TropJion succinctus^ Tenison- Woods, Proc. Lin. Soc, N.S.W., 

 vol. iv., p. 16, tab. J., figs. 6, 6«, 1879. 



Shell elongate-turbinate, apex blunt, of one and a half small 

 subglobose whorls, the tip somewhat oblique ; whorls below 

 the apex 5, convex, somewhat flattened behind ; encircled with 

 distant sharp high keels, rudely rugged at the edge, the wide 

 concave interspaces marked with transverse growth-lines and 

 fine spiral striae. 



Iveels on the penultimate whorl five or six, of which the two 

 or three medial ones are a little larger and more distant than 

 the rest. 



Last whorl somewhat tumid ; ajDcrture nearly circular ; outer 

 lip slightly dilated, thickened and closely grooved within, 

 bevelled to a sharp undulate edge ; inner lip continuous with 

 the outer lip, with a thin erect margin; a strong, oblique plait 

 at the junction with the canal, with a few small denticles be- 

 hind ; canal of moderate length, wide, stout, bent to the left, 

 and much reverted. 



Length, 33 ; breadth, 20 ; aperture, length 13-5, width 9 ; 

 canal length 10, width 4"5. 



Locality. — Lower beds at IMuddy Creek. 



