37<S AlhiDiji ^M.lls(l1lll Rfcoifis. 



I dtclicatt' tliis species to Mr. C. V. Boyes, the Civil Commis- 

 sioner of Cei'es at the time of my visit there, and the officer who 

 sent the fiist diamond found in Soutli Africa to Dr. Atherstone to 

 be tested. 



Palaroneih) arcimta, nov. sp. 



PI. VIII., Fig. 5. 



Shell transversely elongate, almond shaped, twice as long as 

 high. Dorsal margin inclined at an angle of 140° on either side 

 of the limbo. Anterior margin rounded, meeting the hinge line 

 at an obtuse point, and curved under to meet the ventral margin. 

 Ventral margin widely and evenly arcuate with a slight indenta- 

 tion behind. Posterior margin curving up to the hinge line and 

 ending in a rounded point. Beaks situated at a distance from the 

 point equal to tw^o-thirds the height of the shell : quite prominent 

 and incurved to the hinge line. Valves most convex along the 

 middle line, narrowing at the basal edge, as shown in the cast ; 

 arching strong and regular, but decreasing in strength towards 

 the hinder portion. Oblique ridge running from umbo to posterior 

 margin, with a weak sulcus behind. Some trace of small trans- 

 verse teeth in the hinge line, which is slightly curved. Ornamen- 

 tation not apparent as the specimen is a cast, but there were 

 evidently concentric rings of growth. 



Dimensions : Length, 4.4 cm. Height, 2.4 cm. 

 The shell has a strong Leda form, and perhaps may eventually 

 be referred to this genus along with Leda inornata, Sharpe, but 

 the oblique i-idge seems to connect it with the forms of PaJceuneilo 

 with which it is associated, especially P.feeunda. Hall. 



Cat. No. 1('3. Donor : Mi-. A. G. Bain. Locality, Hottentot's 

 Kloof, Ceres. 



NUCULITES, Conrad. 



Nuculites lunulata, nov. sp. 



PI. VIIL, Figs. 6, 6a. 

 Shell tiansversely elongate, not quite twice as long as high. 

 I'osU lior ei.d slightly bioader than the anterior, evenlv rounded 



