191 



lip Urate within ; columella concave behind, a little twisted to- 

 wards the front, inner lip reflected, almost concealing the um- 

 bilical chink. 



Dimensions. — Length, 7*0; greatest breadth, 4-0; height of 

 last whorl, 2*5 nearly. 



Locality. — Eocene; glauconitic sands, Adelaide-bore (3 exs.). 



9. Triehotpopis eostata, spec. nov. 



Shell of moderate size, thin ; whorls of rather rapidly increas- 

 ing width ; spire broadly conical, ending in an obtuse apex of 

 two and a-half obsoletely trilirate whorls. 



Spire-whorls two, medially subangulated ; spiral ornamentation 

 of three slender rounded threads on the posterior slope, and about 

 six alternately large and small anterior to the peripheral angu- 

 lation ; the transverse ornamentation consists of oblique convex 

 costae, narrower than the convex interspaces, and of regular stria- 

 tions, which produce the appearance of fine punctations in the 

 spiral furrows. 



Body-whorl convex, a little tumid, subangulated at the base, 

 ornamented with minutely serrated lirae, alternately large and 

 small, about eight on the posterior slope, about twelve above the 

 basal angulation, and about ten on the base. The transverse orna- 

 mentation consists of about ten arched costations, which are 

 evanescent at the basal angulation, and of coincident striae. 



Aperture rotund, obliquely channelled at the front ; outer lip 

 obscurely lirate within ; columella-lip reflected, almost concealing 

 the umbilical chink. 



Dimensions. — Length, 5-0; greatest breadth, 3'0 ; height of 

 aperture, 2*0. A fragment has a diameter of last whorl of 4*5. 



Locality. — Eocene ; glauconitic sands, Adelaide-bore (4 exs.). 



10. Triehotpopis fenestpata, spec. nov. 



Shell small, thin, turriculate ; whorls five, of slow increase, 

 separated by a channelled suture, terminating in a blunt apex of 

 two convex lirate whorls, the tip relatively very small. 



Spire-whorls two, moderately convex, ornamented with four 

 equal, equidistant, very prominent lir{», crossed by equal, equi- 

 distant, straight costulae of about equal strength to the lirae ; the 

 rectangular intercostal spaces with about three or four transverse 

 threadlets. The intersections of the lirae and costulae are more or 

 less denticulated. 



Body-whorl regularly convex, high and narrow, encircled with 

 about twelve principal lir^e, with an intermediate threadlet be- 

 tween the medial lirae ; the costulae are acute, separated by broad 

 shallowed interspaces, about fifteen in number, the anterior ones 

 of which are continued on to the base; the intercostal spaces with 

 from four to five coincident threadlets. 



