217 



possibly on a more extended knowledge of the recent and fossil 

 species of Erato, tliis may prove a desirable course. 



The denticles on the two lips appear when the adult stage is 

 reached, but the columella-plait belongs to all ages. In its 

 adolescent stage this species resembles Marginella edentula, mihi, 

 a more inflated shell with a convex pillar. The present species 

 differs in shape, being broader and more truncated behind, from 

 all living forms. 



4. Erato Morningtonensis, spec. nov. 

 Similar to B. pyrulata, but is not so tumid, has a longer and 

 more gradually attenuated body-whorl, is more pointed behind, 

 the outer lip with a broadly-rounded shoulder and slightly incurved 

 towards the front. 



The columella has only two or three denticles behind the ter- 

 minal plait. 



Dimensions. — Length, 6 ; width, 3*5 ; height, 3 (at 2*5 mm. 

 from the posterior end). 



The proportional measures of the two species are : — 



E. Morningtonensis — Length, 100; width, 58-3; height 50. 

 U. pyrulata — Length, 100; width, 714; height, 57-1. 

 Locality. — Eocene clays ; Schnapper Point, near Mornington. 



5. Erato duplieata, Johnston. 



Reference. — Geol. Tasmania, tab. 31, fig. 14 ; no description 

 (1888). 



Shell minute, cylindric-oblong, bluntly pointed at both ends'; 

 dorsal profile, flatly convex on the right, rounded and narrower 

 on the left ; spire very short and blunt. 



Aperture moderately wide, nearly straight. Outer lip nar- 

 rowly inflected, somewhat abruptly arched behind, spreading cal- 

 lously on the spire ; denticulate ridges narrow, about 14. Liner 

 lip slightly angled, with a row of small denticles on the keel, 

 exterior to which are a few scattered denticles and ridges forming 

 an irregular outer row. Columella extending internally as a high, 

 slightly concave, smooth plate, the anterior edge of which runs 

 out into an oblique plait, sulcate at the tip, margining the 

 anterior canal. 



The high columella-plafce with its anterior plait-like margin re- 

 calls Cyprcaa ; but as the unique example seems somewhat imma- 

 ture it may be unsafe to speculate on its probable generic 

 position, and so I leave it as originally placed. 



Dimensions. — Length, 5 -5 ; width, 3*5 ; height, 3. 



Locality. — Eocene ; Table Cape (R. M. Johnston I). 



6. Erato (Eratopsis) illota, spec. nov. 

 Shell minute, pyriform-ovate ; spire short, obtusely pointed ; 



