100 



flattened at tlie suture, with four, increasing to six, spiral 

 threads, and about 12 costa3 to each whorl ; the rest of the- 

 spire-whorls medially augulate, ornamented with minutely- 

 scaly spiral lir^e, each whorl with three varices and two unin- 

 terrupted, prominent, intervariceal costie. The varices are- 

 simple, regular, slightly oblique, each bearing medially a stout, 

 somewhat frondosely expanded spine. 



Last whorl with about 15 narrow lirae on the posterior slope ;; 

 there is a strong revolving rib in alignment with the posterior 

 angle of the aperture bearing a short spine on each varix. 

 Between the basal rib and the shoulder there are about 20 lir?e,. 

 and about an equal number anterior to it. The lira? are crossed 

 by moderately distant stride, which produce minute scale-like- 

 serratures at the junctions. 



Aperture oval ; outer lip thin, crenulated on the margin. 

 Canal longer than the aperture, nearly straight and closed. 



Length, 37 ; breadth, 15 ; length of aperture, 9 ; and of 

 canal, 13. 



Locality. — "Gastropod-bed" of the Eiver Murray Cliffs,. 

 near Morgan. 



This fossil has some resemblance to the recent M. crocaiusy 

 Eeeve. 



12. Murex tenuicornis, spec. nov. Plate ii., fig. 6. 



Shell elongately fusiform, with a produced sj^ire, terminating 

 in a small obtuse apex consisting of one and a half smooth 

 rounded whorls ; the rest of the spire whorls are at first convex^ 

 but afterwards becoming increasingly angulated in the middle, 

 each with three thin varices bearing a long slender spine. The- 

 ornament consists of one or two faint spiral threads on the an- 

 terior half of the whorl, and very fine spiral strife and arched 

 growth-lines, the intercrossing of which forms a fine close can- 

 cellation. 



Last whorl angulated, ornamented on the anterior portion 

 with five spiral ribs which terminate on the last varix as short 

 spinous digitations ; the variceal spine is long, slender, and 

 slightl}' arched posteriorly. 



Aperture trapezoidal, much longer than wide ; peristome- 

 continuous, thin, elevated ; outer lip angulated at the keel, 

 with three tubercles within anteriorly situated to the angula- 

 tion ; canal long, flat, closed, nearly straight. 



Length, 19 ; breadth, 7 ; length of canal and aperture, 12 ;. 

 length of last variceal spine, 9. 



Local it if. — Clayey green sands, Adelaide bore. 



The species makes some approach to the recent JL longicornisy 

 Dunker. 



J 



