193 



whorl to whorl, and the suture is consequently usually concealed ; 

 there are about 10 in 1 millimetre-space on the penultimate 

 whorl. 



Body-whorl with about five spiral threads crossed by the radial 

 lamella? above the periphery ; the peripheral angulation is formed 

 of two approximate large exsert threads, with a small thread 

 on the outside of each. The base is flat, with eight encircling 

 threads, the first two or three narrower than the sulci, the others 

 crowded ; the whole surface tessellated by radial threads. The 

 umbilicus is wide and perspective, margined by about sixteen stout 

 granulations, from which proceed the radial threads in twos and 

 threes. 



Aperture rhomboid, peristome completed by a thin nacreous 

 growth. Outer lip roundly insinuated near the suture between 

 the first and third spiral threads ; sharply and shortly notched at 

 the posterior carina ; at the exterior of the base roundly in- 

 sinuated, separated by a similar sinus at the inner angle by a 

 tubercle corresponding with umbilical carina. 



Columella oblique, thickly rounded and slightly reverted on 

 the edge, with a broad deep sinus above ; a strong twisted projec- 

 tion tooth at about two-thirds of its length, below which is the 

 inner basal sinus. 



Dimensions. — Height, 2*75 ; greatest breadth, 3 "00 ; height of 

 aperture, 1*25. 



Locality. — Eocene at Muddy Creek (9 examples). 



This species is simulated by an undescribed Basilissa of the 

 Family Trochiidge, obtained from the Eocene sands in the Ade- 

 laide-bore ; the latter is generically distinguished by its thick 

 nacreous test, by the absence of the sharp tooth of the columella, 

 and has only a sutural sinus. 



FAMILY CONID^. 



Genus Conus. 

 synopsis of species. 



Spire flat, or nearly so. 

 Pullus small. 



No spiral ornament ; pullus acute. 1. C. cuspidatus. 



Spiral threads, wavy-wrinkled transversely. 



2. C. jjtychodermis. 



Spiral rows of flat granules. 3. C. complicatus.. 



Spiral linear-grooved. 6. C. heterosjnra, var. 



Pullus large, obtuse ; body-whorl more or less spirally 



striated. 4. C. pidlulescens^ 



