MKLVn.T. : NOTKS ON THE OENUS HARPA. 29 



H. elegans Deshayes. 

 Ear pa elegans Desh., Coq. Fossiles, p. 643. pi. Ixxxvi., figs. 16-18. 

 Habitat : Upper Eocene, 'les sables moyens.' Bartonian. 

 The ribs are more frequent than in the last species. 



H. lamellifera Tate. 

 Harpa lavieUifera R. Tate, Trans. Roy. Soc. S. Australia, xi., p. 149, 

 pi. vi., fig. 2, 1889. 



„ „ G. F. Harris, Cat. Tert. Moll, Dept. Geol. Brit. 



Mus. Nat. Hist., pp. 78 sqq., 1897. 

 Habitat : Eocene, Muddy Creek, Victoria, Australia. 

 A species with thin elevated lamellge. 



H. sulcosa Tate. 



Harpa sulcosa R. Tate, I.e., p. 150, pi. vi., f. 10, 1889. 



,, ,, G. F. Harris, I.e. 



Habitat : Eocene, with the preceding. 



Distinguished by flat area bordering suture. Lamellae very close 

 together, exceedingly thin. Columellar callosity distinct. 



H. tenuis Tate. 



Harpa tenuis R. Tate, I.e., p. 151, pi. vi., f. i, 1889. 



,, ,, G. F. Harris, I.e. 

 A larger species, proportionately speaking, well developed, with 

 fewer longitudinal lamellae than the last species, with which it occurs 

 at Muddy Creek 



H. abbreviata Tate. 



Harpa abbreviata R. Tate, I.e., p. 150, pi. vi., f. 7, 1889. 



,, ,, G. F. Harris, I.e. 



Habitat : Eocene, with the last three species. Most allied to H. 

 tenuis. It is a much inflated shell, abbreviate, but delicate. 



Sub-Genus II.— Silia Mayer.i 1877. 

 The type Harpa zitteli Mayer found in the Eocene is distinguished 

 by the simple suture. It is rare and peculiar. 



1 Mayer-Eymar, Beitrage Geol. Kane Schweig, Lief. xi\-. (1877). 



