187 



two equal and equidistant narrow flat lirae ; the posterior slope is 

 spirally striated, with or without an inconspicuous medial thread; 

 the whole surface is traversed by close-set sigmoid strise of growth, 

 and at regular distant intervals by raised threads, which produce 

 slight denticulations as they pass over the peripheral angulation. 



Last whorl truncatedly carinated at the periphery; its posterior 

 slope is transversely close-striated and feebly costated (costulse 

 about 12), and further ornamented by one or two slender, more or 

 less medial, spiral threads ; the base has about six encircling flat 

 threads, separated by about equally wide sulci, crossed by close- 

 set striae. 



Aperture acutely oval, channelled in front ; outer lip thin, 

 smooth within ; columella-pillar very prominent, arched ; inner 

 lip slightly reflected near the front. 



Dimensions. — Length, 4*0 ; greatest breadth, 2-0 ; height of 

 aperture, 1-75. 



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

 (2 exs.). 



2. Triehotpopis tabulata, spec. nov. 



Shell small, thin, broadly fusiform, imperforate; whorls six and 

 a-half ; spirej conical, scalar, ending in a blunt apex of two and a- 

 half lirate whorls, the first of which is relatively very small. 



Spire-whorls three, of rather rapidly-increasing width, with a 

 flattish shoulder and angled in the posterior two-thirds, anterior 

 to which they are convex ; the suture is deep. The spiral orna- 

 mentation consists of two equal and equidistant threads on the 

 posterior area ; and of four elevated, equal, equidistant and some- 

 what undulose threads, crenulated on the edge, which occupy the 

 anterior convex area ; the posterior lira forms the peripheral 

 angulation ; on the anterior whorls a more or less slender thread 

 is interposed between the third and fourth. The transverse orna- 

 mentation consists of broad subacute costa-like folds on th e front 

 of each whorl (about 15 on the penultimate), continued very ob- 

 liquely to the posterior suture as depressed undulations ; and of 

 rather distant coincident strise of growth, which produce crena- 

 tures as they pass across the lirae. 



The body-whorl is broad and short, rather tumid, with a 

 rounded convex base, which contracts rapidly into a very short 

 triangular beak. The ornamentation is like that of the spire- 

 whorls, except that there are several threads (seven or eight) on 

 the posterior slope, and that the convex medial area has a slender 

 thread alternating with the lirse ; the base is ornamented with 

 concentric threads alternately large and small. 



Aperture rhomboid-oval, shortly channelled in front ; outer lip 

 thin, strongly lirate within ; inner lip reflected, nearly covering; 

 the umbilical chink. 



