BY C. HEDLEY 753 



Gatliff tfe Gabriel"*^ record a variation of R. amphizosta, which may 

 possibly be this. Cylichna atkinsoni Ten.- Woods,! which also 

 occurs in Sydney Harbour, is larger than E. iredaleana, more 

 inflated medially, more contracted posteriorly, with a narrow 

 vertical pore. 



Named in honour of Mr. Tom Iredale, and in remembrance of 

 the excellent critical work that he has done on the Australian 

 mollusca. 



RiNGICULA DENTICULATA Gould. 



(Plate Ixxxv., fig.95 ) 



E. denticulata Gould, Proc. Bost. Soc. Nat. Hist., vii., 1860, 

 p.325; Id., Tenison- Woods, These Proceedings, ii., 1878, p. 256. 



From Port Jackson, Angas enumerated four species of Ringi 

 aula, viz., caroji, denticulata, doliaris, and exserta. As I have 

 already mentioned {aiitea, xxxviii., p. 336), his identiti cations 

 were incorrect; only R. denticulata and R. doliaris occur here. 

 In the Challenger Reports, R. doliaris was figured, but R. denti- 

 culata has not yet been illustrated. This deficiency is now made 

 good. R. denticulata was taken by the Thetis Expedition in 

 63-75 fathoms, off Port Kembla; it is a rarer shell than R. 

 doliaris. 



EXPLANATION OF PLATES LXXVIL-LXXXV. 

 Plate Ixxvii. 

 Fig. 1.— Type of Lepton concenlricum Gould. 

 Figs. 2, 3. — Type of Kellia halauHtina Gould. 

 Fig. 4. — Type of Suhemargimda radiata Gould. 

 Fig.o. — Type of Elenchus exigims Gould. 

 Fig. 6. — Type of Gerithium lo,ceriinum Gould. 



Plate Ixxviii. 

 Figs.7, 8, %.~Leda dysera Hedley. 

 Figa.lO, IL— L. eUctilis Hedley. 

 Figs. 12, 13, 14.— L. narlhtcia Hedley. 

 Figs. 15, 16. — Porohda ensicula Angas. 

 Figs. 17, 18. — Poroleda spathula Hedle}'. 

 Figs. 19, 2^.— Area strabo Hedley. 



*GatliflF& Gabriel, Proc. Roy. Soc. Vict., xxi., 1908, p. 384. 

 tProc. Roy. Soc. Tasm., 1876, p.l56; 1902, p.113, fig.ll. 



