148 



bounded behind by a narrow flat band. In young specimens the 

 callous growth occupies a broad zone around the anterior suture, 

 leaving a dark coloured narrow belt at the posterior suture. 



Diiaensions. — Length, 19 ; breadth, 6 ; length of aperture, 9. 



Localities — Turritella-clays at Blanche Point, Aldinga ; clayey 

 green-sands, Adelaide-bore. 



This resembles A. semilwvis, T. Woods, but has a Ijlunt apex,, 

 and is more strongly angled at the suture. 



8. Ancillaria semilaevis, Tenisoii Woods. 



Eeference. — Proc. Linnean Soc, N.S. Wales, 1879, p. 229, tab, 

 20, tig. 7. 



A slender elongately fusiform shell, with the ajDerture less than 

 half the total length ; spire acuminately j^ointed, slightly angled 

 at the sutures ; callosity of spire minutely granular. 



Dimensions. — Lengih, 19 ; breadth, 6 ; length of aperture, 9. 



Localities. — Lower beds at Muddy Creek ; River Murray 

 Cliffs ; Schnapper Point. 



9. Ancillaria pseud-australis, spec. nov. Plate vii., fig. i. 



Shell stout, fusiformly ovate ; spire pyramidally acuminate, a 

 little constricted anteriorly, thence tapering to a small mamil- 

 lary pullus. Callus of spire obscurely spirally lined and minutely 

 graimlated. 



Last whorl slightly ventricose, tumid in front of the suture. 

 The two basal grooves each ending in a denticle on the outer lip. 

 Columella twisted, with thin plaits. 



Dimensions of a moderately sized specimen : — Length, 47 ; 

 breadth, 19 ; length of aperture, 26-5. 



LocaJities. — Lower beds at Muddy Creek ; River Murray 

 Cliffs, near jMorgan ; well-sinkings, JMurray Desert ; blue clays, 

 Schnapper Point. 



This species has been referred to the living species A. australis 

 and A. mucronata ; from the former it is more markedly distinct. 

 The Tasmanian conchologists believe that the latter species was 

 founded on a fossil from Table Cape, but Sowerby's and Reeve's 

 illustrations indicate a highly coloured and therefore presumably 

 a living shell, and in my opinion a different shell from the fossil, 

 which may be distinguished by its longer and constrictedly 

 acuminate spire. 



A. pseud-a astral is is not unlike xi. hnccinoicles of tlie Euro2:)ean 

 Eocene, which is, however, less ventricose. 



The unique specimen from a well-sinking in the Murray desert, 

 represented by tig. 13, plate vi., is provisionally referred to 

 A. pseacI-cuistraJis as an obtuse variety resembling A. ohtnsa from 

 Cape of (xood Hojoe, Detached spires similar to that of this 



