1867.] TATE — SOTJTH-AFEICAX FOSSILS. 161 



imperfectly defined obtuse angle ; it is ornamented with delicate, 

 eleyated, closely arranged and regular concentric rugae. 



This species is named after llr. Xiven, a fellow-TTorker with Dr. 

 Eubidge in the geology of the Cape. 



Dimeiis. Length -^ of an inch, height i-§ of an inch, length 

 of posterior side ^ of an inch. 



Log, In grey sandy limestone, Sunday's Eiver. 



Ctpezxa Boecheedsi, spec. nov. PI. VIII. fig. 2. 



Shell OTate-ohlong, transverse, inequilateral, somewhat inflated ; 

 posterior side angulated,the margin truncated; anterior side rounded; 

 front margin slightly arcuate ; umbones large, oblique, sHghtly re- 

 curved; ornamented by irregular-sized and^ close-set lines of 

 growth coincident with the margin. [IS'amed in memory of the late 

 Mr. M. Borcherds, Civil Commissioner at Port Beaufort, who warmly 

 assisted the late Mr. A. G. Bain in his early researches in South- 

 African Geology.] 



Dimens. Length 44 millimetres, height 3-1 millimetres. 



Loc. Zwartkop Eiver (Ruhidge). 



CucFLL^A (Maceodox) Atheestoxei, Sharpc, sp. 



Area Atherstoni, Sharpe, Geol. Trans. 2nd ser. vol. vii. p. 196, 

 pi. 22. fig. 10. 



If CumUcea and Area be regarded as generically distinct, then the 

 former name should be applied to this species, as I have determined 

 by an examination of the type specimen that the hinge-teeth are 

 longitudinal towards the margin. It belongs to the group Maerodon. 



CtjCTJll^a Keatjssii, spec. nov. 



Cucullcea ? cancellata, Xrauss (non Area eanceUata, Sow., nee 

 CiccuUcea cancellata, Phillips). 



As the above-quoted specific name given by Krauss to an Area- 

 like sheU is preoccupied, not only for Area, but for Cucullcea, 1 pro- 

 pose the name " Kraussii " instead. 



Yery perfect specimens collected by Dr. Eubidge on the Zwartkop 

 and Sunday's Elvers exhibit the hinge- characters of this species; 

 its position in Cucidlcea is incontestable. 



Aeca (CrcrLL^A ?) Jo:jfEsi, spec. nov. PI. IX. fig. 9. 



Shell rhomboidal, convex ; umbones slightly anterior to the middle 

 of the valve, large, depressed, and approximate. Anterior side short, 

 its margin rounded; posterior side with an acute carina, posterior 

 to which is a slightly concave surface ; the inferior margin is nearly 

 straight. Eadiating costse flat, slightly nodulous ; elevated upon the 

 anterior and posterior portions of the valves ; much larger, more 

 distant, and acute upon the anterior side ; decussated by numerous 

 concentric lines and strise. 



Dimens. Height 1*2 millim. ; length 1*8 millim. 



Loc. In a greenish-grey sandy marl, rather hard and very cal- 

 careous ; near the Bridge on the Zwartkop Eiver. 



