148 Gatliff and Gabriel: 



EsTEA KERSHAWi, Tcnison-Woods. 



1877. Rissoina kershawi, Ten.-Wds., these Proc, v. XIV., 



p. 57. 

 1919. Estea kershawi, Ten.-Wds. May, P.R.S., Tas., 

 p. 60, pi. 15, f. 11. 

 Hah. — Dredged in about 8 fathoms, off Rhyll, Western Port. 

 Ohs. — Size of type: Length 3, breadth 1.33 mm. 



^STEA MICROCOSTA, May. 



1919. Estea microco'sta, May. P.R.S., Tas., p. 61, pi. 

 15, f. 12. 

 Hab.—0& Wilson's Promontory. 



Obs. — Identification endorsed by the author, who remarks: 

 "** This is closely related to E. kershawi. It differs principally in 

 the much more numerous and fine ribs, and rounder mouth and 

 its rather more cylindrical form." Size of type: Length 2.5, 

 breadth 1.2 mm. 



Genus Amphithalamus, Carpenter 1863. 



This includes our shells listed as Rissoa approxima, Petterd; 

 R. jacksoni, Braz. ; and R. petterdi, Braz. 



Genus Anabathron, Frauenfeld 1867. 

 This includes the species listed as Rissoa contabulata, Frauenf. 



Genus Epigrus, Hedley 1903. 



This includes our shells listed as Rissoa verconis, Tate; R. 

 verconis, Tate, var. apicilata, Gat. and Gab. ; R. dissimilis, 

 W^atson. 



Genus Notosetia, Iredale 1915. 



This includes our shells listed as Rissoa atropurpurca, Dkr. ; 

 R. atkinsoni, Ten.-Wds.; R. nitens, Dkr.; R. simillima, May; 

 R. pellucida, Tate and May; R. pertranslucida, May; and R. 

 7me Ian chroma, Tate. 



Genus Subonoba, Iredale 191 5. 

 This includes our shell listed as Rissoa bassiana, Hed. 



