358 APPENDIX. 



Scalaria striata. 

 Marine Shells, Plate 2./. 6. 



Shell conical, turreted, white, whorls rounder convex, 

 close together, minutely, closely and regularly spirally 

 striated, and crossed with rather close thin equal lamina? ; 

 front of last whorl simply rounded ; the axis about twice as 

 long as the diameter of the last whorl, perforated; suture 

 simple. 



Mouth ovate, the concentric laminae near the mouth 

 thicker and more crowded. 



Axis 16 lines, diameter 8 lines, length of mouth 6 lines. 



Inhab. — Port Essington. Cabinet of Mr. Cuming. 



There is in the collection an imperfect specimen of a 

 second species from the same locality, which differs from the 

 former in being more elongate and tapering, smooth, not 

 spirally striated, the crossribs thicker, rather farther apart, 

 and the whorls rather more pressed together at the suture. 

 It may be called Scalaria Essingtoniensis, Axis 9 lines, 

 diam. 4 lines. 



Imperator nobilis. 

 Marine Shells, Plate 2,/. 7. 



Shell trochiform, pale white ; spire conical. 



Whorls nearly flat, smooth, the outer edge of the upper 

 whorls being furnished with a broad expanded margin, 

 which is broadly plaited on the upper side ; the plaits be- 

 coming thicker and more prominent on the edge of the last 

 whorl. 



The front of the last whorl with regular spiral ridges, 

 each crossed with regular imbricate arched scales, the second 



