115 



The ornament consists of stout spiral threads, narrower than 

 ihe flat intervening sulcations, and of transverse stout stride, 

 which form shallow pitted square interstices by the intercross- 

 ing of the lirae. 



The number of nodulations on the body whorl is six, increas- 

 ing to eight on the penultimate. The spiral lirae on the pos- 

 terior slope of the body whorl are four or five in number, and 

 about ten anteriorly. 



Aperture large, oval ; outer lip externally simple and sub- 

 angulated medially, internally with seven stout lirae ; canal 

 very short, wide, and truncated. 



Length, 9-5 ; breadth, 6 ; length of aperture and canal, 5. 



Locality. — Upper beds at Muddy Creek. 



The living analogue of this species is Purpura reticulata., 

 Quoy and G-aimard, inhabiting Southern Australia, from which 

 it differs by the stronger spiral costulation, more open cancel- 

 lation, stouter tubercles, by the greater breadth of the last 

 whorl, which is somewhat abruptly contracted into the beak, 

 and consequently by the more angulated aperture. In the 

 living species the last whorl gradually tapers anteriorly, and 

 the internal lirse on the outer lip are not so strongly developed 

 as in the fossil. 



SPECIES EXCLUDED. 



E. purpuroides, Johnston, is transferred to Pisania. 



FAMILY TEITONID^. 



GrENUS EaI^ELLA. 



1. Ranella Prattii, T. Woods. Plate vi., fig. 6. 



Triton Prattii, T. Woods, Proc. Lin. Soc, N.S.W., vol. iii., 

 p. 223, t. 21, f. 15, 1878. 



Shell ovate, conical, very contracted at the base into a short, 

 recurved, somewhat twisted snout. Apex obtuse, consisting of 

 two and a half polished, rounded, rapidly-increasing whorls. 

 "Whorls six, exclusive of the embryonic whorls, compressed, 

 ventricose, rounded, with a deep narrow undulated suture, of 

 regular increase ; but the last is disproportionately large, its 

 base is rounded but contracted, and a littld flattened towards 

 the beak. Varices in two rows, one on each side, slightly im- 

 bricating in each row, almost continuous and axial, convex, 

 compressed, and elevated. Posterior whorls tessellated by 

 transverse costulae and spiral lirae ; on the anterior whorls the 

 inter variceal transverse plications are gradually reduced in 

 number, and finally to four. On the body whorl the sjDiral 

 ridges are six in number, equal and equidistant, with five or 

 more flat threads in the interspaces, cancellated by transverse . 

 raised lines. 



