h No intervariceal nodulations 



Posterior spine very long and attenuated. 



12. 31. tenuicornis. 

 Posterior spine stout, somewliafc upward 



dilated and truncated. 



13. M. amhjyceras. 

 III. Shell fusiform ; varices simple, irregular. 



Varices three on last whorl, increasing in number pos- 

 teriorly ; apex small acute. 15. ilZ". irregularis. 



Varices three to each whorl ; apex large obtuse ; 

 lamellae closer. 14. JSI. Hamilton en sis. 



8. Murex lophoessus, spec. nov. Plate ii., fig. 5. 



Shell ovate, conical ; whorls eight, including two small 

 smooth rounded turbinated apical ones ; the rest of the whorls 

 ventricose, rounded, ornamented with compressed spiral ribs, 

 and transverse lamellae of growth. Varices, three to each 

 whorl, those on the anterior whorls more or less regular, 

 narrow, thin, and pectinated ; the varices of the posterior 

 whorls are simply crenulated by the lirae which pass over 

 them. 



The spiral ribs, which are from six to eight in number ou 

 the penultimate whorl, are very narrow, the broad concave 

 intervening furrows usually having a medial slender thread ; 

 they are traversed by rather crowded lamellae of growth, which 

 form inconspicuous scales on the lirae. There are usually 

 three or four intervariceal costae, w^hich are never very promi- 

 nent — not at all developed on the posterior five or six whorls. 



Last whorl with from 12-1'! principal lir« which are con- 

 tinued on to the varices, there projecting as small serratures. 

 Aperture oval ; peristome continuous ; inner lip faintly lirate 

 within ; outer lip stoutly lirate within, its margin serrated. 

 Canal closed, depressed, short, sinistrally bent tind slightly 

 recurved. 



Length, 40; breadth within the varices, 23 ; height of aper- 

 ture, 13'5 ; length of canal, 12. 



Localities. — Blue clays at Schnapper Point, Port Philip ; 

 lower beds at Mudd}^ Creek. 



9. Murex Dennanti, sj^ec. nov. Plate ii., tig. 7. 

 Shell elongate-fusiform ; whorls eight, including two small, 

 rounded, smooth apical ones ; the rest of the spire whorls con- 

 vex, slightly depressed at the posterior suture. Varices three, 

 more or less regular compressed, each bearing at the angulation 

 of the whorl a short, broad, erect spine. The fourth, fifth, and 

 sixth whorls with tessellated ornament, more or less "rauulated 



