435 



DESCRIPTION OF A NEW 8PECIES OF LIPAEUS 

 FROM WEST AUSTRALIA, 



By J. C. Cox, M.I)., F.L.S. 



BULIMINUS (LiPARUS) GRATWICKI, n.Sp. 



(Figs. 1-3 ) 



Shell cylindrically pyramidal, deeply rimate. The shells 

 before nie are a dead chalky white (this may only be a 

 bleached condition of an otherwise coloured shell) ; whorls 

 seven and a half (of which the uppermost two are nepionic), 

 rounded, slowly increasing in length, and separated by a narrow 

 deeply impressed suture, the last whorl is 17 mm. long and 10 mm. 

 wide; the surface of the whorls is 

 rough, having longitudinal ai'cuate 

 riblets formed by lines of growth 

 irregularly disposed in larger and 

 smaller groups sharply outlined ; 

 these cross each whorl, except the 

 apical, from above downwards and 

 plicate the suture as they end in and 

 commence from it ; on the upper 

 whorls, commencing as they do about 

 the middle of the 3rd whorl, these 

 arcuate riblets are only slightly 

 raised, but become harsher as they 

 descend. The nepionic w^iorls are sculptured by a very distinct 

 network of oblique reticulating wrinkles. The longitudinal 

 riblets are cut across at right angles by numerous fine spiral 

 grooves commencing about the 3rd whorl and continuing in 

 a spiral manner till they reach the body whorl; as they pass 



