79 



Harpa (Eocithara) lamellifera, Tate. . 



1889. Harpa lamellifera, Tate, Trans. Eoy. Soc. South Aust. vol. xi. p. 149, 

 pi. vi. fig. 2. 



The protoconch of this species (Plate lY. Figs. 3«-J) is very 

 different to that of either S. siilcosa or H. tenuis, descriptions of 

 ■which follow. It is more depressed than that of the type of the 

 genus, from which it differs also in being striated. It recalls 

 the protoconch of the Pliocene and living Valuta musica, Linn., 

 though it is not quite as large. Compared with the protoconch 

 of specimens of H. mutiea, Lamk. (the subgeneric type), of the 

 Parisian Eocene, it is relatively much larger and is more depressed, 

 though of the same general character. 



The ornamentation of the whorls consists of thin, elevated, 

 curved lamellae close together, the anterior portions of which are 

 twisted so as to obscure the suture ; between each of these 

 are three or four fine longitudinal lineations and many spiral stri« 

 closely set, the latter being continued up the posterior side of 

 the lamellae. The columellar border is covered with callus ; the 

 anterior portion, however, is comparatively free therefrom, being 

 sharply defined and elevated. The successive stages of growth of 

 the anterior canal have left a well-marked, broad, rounded ridge, 

 between which and the elevated columellar border is a deep 

 rugose sulcus. 



Dimensions. — Length 34-5 mm.; breadth 23 mm.; length of 

 aperture 27 mm. 



Form, and Loc. — Eocene : IMuddy Creek, Victoria. 



G. 4215. Two examples of the adult. 



Presented hy John Bennant, Esq. 

 G. 9336. Two specimens of the neanic stage of growth. 



Purchased. 



Harpa (Eocithara) sulcosa, Tate. 



1889. Harpa sulcosa, Tate, Trans. Roy. Soc. South Aust. vol. xi. p. 150, 

 pi. vi. fig. 10. 



It is noteworthy that the subgeneric distinction previously 

 observed should be emphasized also in the protoconchs of this 



