•234 



The cost{i3 are subacute, moderately elevated, sliglitly angulated 

 post-medially. The median area of each whorl with three Hattish 

 equidistant lirae ; there is a slender threadlet at the anterior 

 suture, but the posterior slope is smooth. There are four stout 

 line on the median poi-tion of the body-whorl, the anterior one of 

 which forms a basal keel ; the base is ornamented with three 

 distant, encircling, filiform lira^. Aperture quadrately oval, outer 

 lip thin. 



Diinensioiis. — Length, 4 ; width, 1, 



Locality. — Eocene ; Muddy Creek ! (very rare). 



23. Sealaria (Aerilla) crebrelamellata, xptc nor. 



Shell rather thin, very slender, imperforate ; ordinary whorls 

 nine, flat, with a slightly channelled suture ; nuclear whorls two 

 and a-half, the anterior one much contracted and ornamented 

 Avith crowded oblique threadlets, the next is inflated and smooth 

 ending in a bulbiform tip. 



The transverse ornament of oblique, crowded, short, erect 

 lamella^, which are usually so dense as to conceal the suture and 

 the spiral ornament; the latter consists of five, equi-distant, equal, 

 narrow, elevated, flat-edged line. 



Body whorl with six spiral line, the anterior one interrupting 

 the convexity of the base ; base with a strong spiral thread and 

 radially striate. 



Dimensions. — Length, 9 ; width, 2. 



Locality. — Eocene ; Muddy Creek (very rare). 



24. Sealaria (Hemiaeirsa) lampra, spec. nor. 



Shell Turbonill a -like, subulate-turrited, stout, smooth and 

 shining; ordinary whorls about 10, nearly flat, costated, variced 

 and spirally linear-grooved : apex pointed of about two small 

 convex whorls. 



The costa^ are straight, slightly oblique, subacute and moder- 

 ately raised, separated by much wider concave interspaces ; from 

 about 12 to 15 in each whorl. The varices are broad and rather 

 depressed. 



The sj^iral ornament consists of flat grooves, with wider flat 

 interspaces, somewhat irregularly disposed and varying from 

 about five to eight in number. 



Base convex, concentrically wrinkled-grooved ; aperture oval, 

 well-rounded at the front ; outer lip thin, margined behind by a 

 varix ; columella slightly thickened internally. 



Dimensions. — Length, 12; breadth, 3; diameters of aperture, 

 2-25 and 1-75. 



Locality. — Eocene ; not uncommon in the Tiirritella-h£a\&% 

 Blanche Point, Aldinga Clifl's. 



