92 STUDIES ON AUSTRALIAN MOLLUSCA, 



chocolate to pale ochre, the primary whorls always darker than 

 the remainder. .Sculpture : four, evenly spaced, spiral, sharp cords 

 ascend the whorls, midway in their interspaces on the upper 

 whorls threads appear, which increasing in more rapid proportion 

 rival on the last whorl the primary cords; one specimen before 

 me thus exhibits on the last whorl nine equalty sized and spaced 

 cords. Both cords and interspaces are crossed by coarse, irregular, 

 arcuate growth-stria?. The apical whorls are obliquely, longitu- 

 dinally ribbed, thus recalling normal Cerithiopsis sculpture. A 

 keel appears, the ribbing diminishes, and by gradual transition 

 the adult sculpture is attained The l»ase is concave, above 

 smooth, below faintly spirally ribbed. Columella arched, canal 

 short and straight. The dark specimen figured measures — length 

 9 mm , breadth 2 mm. A pale, more strongly ribbed shell 

 measures — length 10 mm., breadth 2-5 mm. 



Hah. — Balmoral Beach, Middle Harbour, near. Sydney. I 

 have collected a dozen dead specimens. 



No members of Sella (A. Ad.; Ann. Mag. N. H. [3], vii. 1861, 

 p 130) have been yet noticed in Australia. The present species 

 differs from the type S. dextroversa, Ad. & Rv., (Voy. Samarang, 



Zool. pi. xi. p. 31) by more lyra?, more rounded 



whorls, and a straighter canal. 



Type to be presented to the Australian 



Museum. 



Stylifer louder.e, Petterd. 



Petterd, Journ. of Conchology, ix. 1884, p. 140. 

 Mr. A. U. Henn has already reported in 

 these Proceedings (Vol. xxi. p. 500) finding this 

 species at Long Bay. A single, worn specimen 

 lately occurred to me on Balmoral Beach. To 

 facilitate the recognition of the species by others 

 I add now an illustration of a fresh and 

 coloured Tasmanian example, kindly lent me for the purpose 

 by the active lady conchologist whose name it bears. 



