97 



large, ovate, peristome continuous, outer lip edentulous ; canal 

 straight and short. 



Length, 20 ; breadth, 8-5 ; length o£ aperture and canal, 7. 



Locality. — Upper beds at Muddy Creek. 



Murex trinodosus is separable from the recent M. Angasi, 

 Crosse, by being broader across the posterior part o£ the body 

 whorl, by the variceal spine not hooked, by the less angulated 

 whorls, longer canal, and by having three stout intervariceal 

 nodulations instead o£ two inconspicuous ones. 



6. Murex bifrons, sipec. nov. Plate i., fig. 12. 



Shell ovately trigonal, stoutish ; whorls six, convex, spirally 

 equally ridged ; apex obtuse, of one and a half smooth whorls. 

 Varices foliaceous, moderately broad, erect, oblique, and 

 irregular ; there are three on the body whorl, but six on each 

 of the posterior whorls. Body whorl with about 20 equi- 

 distant slender, spiral threads, transversely striated ; margin 

 of the anterior varix slightly crenulated between the lirse. 

 Aperture large, subquadrate ; peristome entire ; outer lip 

 tuberculated on the thickened margin ; canal short, open, 

 curved. 



Length, 15"5 ; breadth, 6 ; length of aperture and canal, 9. 



Localities. — Adelaide bore and "Turritella clays" at Blanche 

 Point, Aldinga Bay. 



7. Murex didymus, spec. nov. Plate iv., fig. 13. 



This species is similar to the last, but has few (eight) and 

 stouter spiral ridges on the body whorl, whorls flatly convex, 

 the canal is proportionately longer, and the margin of the 

 anterior varix is entire. 



Length, 17-5 ; breadth, G'S ; length of aperture and canal, 

 11"5. 



Locality. — Blue clays at Schnapper Point, Port Phillip. 



SuBaEis-us Chicoreus. 



SYJS^OPSIS OF SPECIES. 



I. Shell ovate ; varices on anterior whorls crenately spinu- 

 lose. 8. M. toplitessus. 



II. Shell fusiform ; varices spiniferous, regular. 



A. Posterior spine short and broad. 



Whorls rounded, penultimate whorl, equally lirate. 



9. M. Dennanti. 



"Whorls subquadrate, penultimate whorl with three 



strong lirse. 10. M. Adelaidensis. 



B. Posterior spine long. 



a Two intervariceal cost?e. 11. M. hasicinctus. 



