SOME NKW OK NOTEWORTHY SHKLLS — HEDLEY. 141! 



Hah. — Type from brackish water in Deewhy Lagoon a few 

 miles north of Sydney. Here I found the species living in 

 abundance on the thread-like foliage of a plant which Mr. J. H, 

 Maiden has kindly identified for me as Ruppia maritima, Linr.e. 

 It was associated with Tale.a rvjilabris, A. Adams, Salinator 

 fragilis, Lamarck, and Modiola stibtorta, Dunker. The shell was 

 also taken in the neighbouring las^oou of Fieshwater by the late 

 Mr. F. E. Grant. I have also seen it in a mangrove swamp in 

 Lane Cove, Port Jackson. 



CrOSSEA GEMMATA, sp. 710V. 



(Plate xli., fig. 19). 



Shell rather large, thin, pellucid. Colour uniform white. 

 Whorls four and a half, rounded, last whorl descending, almost 

 free finally. Sculptux'e : protoconch of a whorl and a half small 

 and smooth, on the following whorls about half a dozen sniKll 

 sharp spiral keels whose interstices are latticed by radial ribs, 

 these latter fade gradually away. On the body whorl the spirals 

 amount to about thirteen, broad flat smooth interstices separate 

 narrow sharp erect ridges. The crest of each spiral is beset Avith 

 a row of very minute and crowded beads, about eighty to a whorl. 

 Aperture subcircular, the outer lip fimbriated by the ends of 

 the spirals. A funicle represented by the innermost spiral running 

 out to the anterior angle of the lip. Umbilicus deep and narrow. 

 Length, 375 ; breadth, 3 5 mm. 



No other species in the genus has beaded ribs, though in 

 cancel late sculpture C. concinna, Angas, and C. cancellaia, Ten. 

 Woods, make an approach. 



Hab. — I collected a single specimen on the beach at Mapoon, . 

 Gulf of Carpentaria. 



COUTHOUYIA ASPERA, Sp. nov. 



(Plate xli., fig. 18). 



Shell ovate-acuminate, thin. Colour white. Whorls six, 

 rapidly increasing, gradate, last descending almost uncoiled. 

 Sculpture : last whorl with about twenty-five fine spiral sharp 

 equal threads, decussated by tine radial threads which latterly 



