189 



interspace, the lamellae appear as slight subimbricating squamse^ 

 on the lirae. 



Body-whorl short and broad, ornamented with four strong lirsfr 

 and otherwise as the spire-whorls ; the base is abruptly contracted, 

 flatly convex and ornamented with four concentric threads, the 

 two outer ones distantly separated, the two inner ones approxi- 

 mate. Aperture quadrately rotund, attenuated in front to a 

 slight channel ; outer lip thin, crenulated on the edge and deeply 

 sulcated within corresponding with the external lirae. Columella 

 slightly arcuate, with the inner lip reflected and almost concealing 

 the umbilical chink. 



Dimensions. — Length, 3-5 ; greatest width, 2 ; height of aper- 

 ture, 1-5. 



Locality. — Eocene ; glauconitic clayey sands, Adelaide-bore 

 (1 ex.). 



5. Triehotpopis aeereseens, spec. nov. 



Shell of moderate size, imperforate, whorls seven, convex, 

 much narrowed at the sutures ; spire elevated, ending in a blunt 

 apex of one and a-half smooth inflated whorls. 



Spire-whorls convex, rapidly increasing in width, with five 

 strong equal and equidistant elevated truncated lirae, with a 

 sixth partially concealed at the anterior suture ; crossed by stout, 

 arched threads, about equal in breadth to the interstitial angular 

 furrows, about 10 in a breadth of 1 mm. on the penultimate 

 whorl. 



Last whorl convex, gradually contracted at the base into a 

 very short beak, ornamented with about 10 raised truncated 

 threads and transversely by arcuate striae. Aperture quadrately 

 rounded ; outer lip thin, smooth within ; columella nearly 

 straight, inner lip reflected, almost concealing the umbilical 

 chink. 



Dimensions. — Length, 11*5; greatest breadth, 5*5; height of 

 aperture, 4-5. 



Locality. — Lower beds (Eocene) at Muddy Creek (2 exs.). 



6. Triehotpopis quinquelipata, spec. nov. 



Shell of moderate size, rather thick, turriculate, imperforate ; 

 whorls seven, convex, of slow increase, medially subangulated, 

 ending in a blunt apex of two smooth convex whorls. 



Spire -whorls four ; spirally ornamented with five equidistant, 

 raised, truncated lirae, the medial one is stouter than the others 

 and forms a subangulated periphery; transversely ornamented by 

 fine, close-set, regular, slightly oblique striae. 



Body-whorl narrow and long, rapidly but not abruptly nar- 

 rowed at the base ; ornamented with about 1 2 truncated cingula. 



