216 



Marginella micula, mihi, a cohabitant species, very closely 

 simulates tliis Erato, 



2. Epato australis, Tate. 



Reference. — Op. cit., p. 90, 1878. 



Shell elongate-oval, fusiform, acute at both ends ; spire acutely 

 conical, rather elevated. 



Whorls five, body-whorl rotundately angled in front of the 

 suture and constrictedly attenuated at the front. Spire-whorls 

 slightly convex, ending abruptly in a small flattened pullus of 

 one and a-half exceedingly narrow whorls. 



Aperture rather narrow, slightly insinuated behind, narrowed 

 at the front. Outer lip moderately thickened and inflected, 

 ascending to the middle of the penultimate whorl, with about 20 

 tooth-ridges. Columella with four (usually), slender, oblique 

 rounded thread-like ridges succeeded behind by a few denticles 

 (not always developed). 



Dimensions. — -Length, 8 ; width, 4 -2 5 ; height, 4 (at 4 mm. 

 from the posterior end). 



LocalifAes.— Eocene. Aldinga Cliffs and Adelaide-bore (very 

 common) ; rare at Spring Creek ! 



3. Erato pyrulata, spec. nov. 



Shell pyriformly ovate, tumid, the right side steeply sloping, 

 the left somewhat inflated ; highest near the posterior end, 

 steeply rounded to the very short spire of three depressed whorls 

 (in senile examples, callously covered), rapidly attenuated to the 

 front. 



Aperture moderately wide, nearly straight, but widest and 

 emarginate behind, narrowed to the short anterior canal. Outer 

 lip thickened and reflected, its inner margin with from 14 to 16 

 short prominent tootli-ridges ; bent at right angles to meet the 

 spire on wdiich it extends or projects beyond it, thence it is 

 straight to the front. 



Inner lip angulated, with small denticles on the keel behind 

 the twisted columella-plait which runs out on the short beak as 

 an elevated margin. 



Dimensions. — Length, 7'5; width, 5; height, 4 (at 2-5 mm. 

 from posterior end). 



Localities. — Aldinga Cliff's and Adelaide-bore. 



E. pyrulata is not well placed generically, its terminal spiral 

 plait on the columella, running out to form the left margin of a 

 slightly effuse canal, recalls 2IargineUa and Cypnta, and to some 

 extent Ovulum : but as it presents, in the adult, the characteris- 

 tic angulated and denticulated inner lip of Erato, I am unwilling 

 to establish a new genus for it and the two following species 



