105 



B. Embryouic whorls rounded, apex obtuse. 



a. Varices very foliaceous, raised into spinulose 

 ^ squamae. 25. J/, prionotus. 



h. Varices bluntly tuberculated at the shoulder. 



26. M. minutus. 

 c. Varices without tubercles or elevated squamae. 



* Spiral threads on last whorl, thick, 10. 



27. M. crassiliratus. 

 ** Spiral threads on last whorl, thin, 20. 



Outer lip not dentate within. 



28. M. alveolatus. 

 Outer lip with three tubercles within. 



29. M. tridentatus. 



21. Murex biconicus, spec. nov. Plate i., fig. 3. 

 Shell elongate, triangularly ovate, with a low flat spire ter- 

 minating in a small mamillate apex of two whorls. Whorls 

 seven. Avarices six, on the last whorl ; lamelliform stout, 

 raised into short vaulted scales over the spiral lirae, more con- 

 spicuously so on the shoulder of the whorl, posterior to which 

 they are suddenly bent forward, and become almost lost in de- 

 pressed extended lamellae. The number of varices progressively 

 increases posteriorly, at first appearing as nodulations at the 

 anterior suture, and with the slightly increasing convexity of 

 whorls acquiring the form of short costae, ending posteriorly at 

 the carination in blunt tubercles. Last whorl convex, angu- 

 lated in the posterior third by the suddenly enlarged varices, 

 between which the periphery is deeply undulate. On the rather 

 high sloping posterior area there are about eight unequal 

 slender spiral lirae ; the shoulder is ridged medially, and finely 

 striated on the flanks ; on the anterior part there are about 12 

 angular lirae, alternating with an equal number of smaller 

 •ones. The furrows between the varices are obscurely trans- 

 versely lamellated. The spire whorls are lirate and transversely 

 lamellated. 



Aperture large, oval ; inner lip reflected over the columella ; 

 outer lip faintly lirate within. Canal wide open, shorter than 

 the aperture, nearly straight. 



Length, 34*5 ; breadth, 19 ; length of aperture, 15 ; width of 

 aperture, 9 ; length of canal, 10. 



Locality/. — In a well sinking, E,iver Murray desert. 



22. Murex camplytropis, spec. nov. Plate iii., fig. 2. 

 Shell ovate, thick, with a moderately produced spire of some- 

 what convex whorls, terminating in a relatively large mamilla- 

 ted apex, consisting of one and a half smooth globose whorls. 

 -Spire whorls, excepting the apical whorls, varying from convex 



