1867.] TATE SOUTH- AFEICiJN" FOSSILS. 157 



Uttilus Jo:xesi^ spec. noY. PI. YIII. figs. 4 a, 4 h. 



% Shell nearly triangular, smooth, shining; hinge-margin straight and 

 long ; anterior margin elevated in its median portion ; umbo terminal, 

 acute, depressed, ornamented with closely arranged, imbricating, 

 concentric folds. 



Named in compliment to Prof. T. Rupert Jones, who has taken 

 part in the elucidation of the geology of South Africa, and whose 

 kind assistance I gratefully acknowledge. 



Dimens. Greatest length 1-9 millimetre; greatest breadth 1 

 millimetre. 



Log. In a greenish, coarse-grained sandstone with calcareous 

 cement, Sunday's Eiver {Riibidge). 



Mttilits Stowia:xt;s, spec. nov. PI. IX. figs. 3a, 3?>. [Subgenus Li~ 

 tJiodomus.'] 



Shell pod-shaped, cyhndrical, elongated, rather depressed, um- 

 bones small, contiguous, slightly inflated, anterior side narrow, pos- 

 terior side wider and less compressed, upper and lower margins 

 straight and nearly parallel ; concentric plications few and delicate ; 

 radiately striated. 



Loe. In a fine-grained, grey, sandy limestone, Sunday's Rirer 

 (AtJierstone and Uuhidge). 



Httiltts Ei7bii)gei, spec. nov. PI. IX. fig. 11. [Subgenus 2Iodiola.'\ 



Shell transversely elongated, with a straight dorsal edge ; anterior 

 part narrow and curved ; posterior tapering at the end, divided into 

 two portions by a very obtuse angle ; superior and posterior part 

 with numerous oblique plications, which are continued to the keel, 

 and numerous slender folds which are coincident with the phcations, 

 but on reaching the keel continue parallel to the ventral margin. 



Dimens. : — Total length 5-25 millimetreSc 



Length of posterior side . . 5-18 „ 



Height 0-9 „ 



This shell is very distinct in its ornamentation from Modiola 

 Bainii, Sharpe ; but in that respect has a greater resemblance to 

 Mytilus Sow erhy anus, D'Orb. ; both, however, are straighter shells 

 than M. Muhidgei. 



Log. In the greenish sandy limestone of the Sunday's River ; 

 many specimens (Eubidge). 



AsTAKTE Pen-chiis^ian-a, spec. nov. PI. IX. figs. 7a, 76. 



Shell small, ovately orbicular, depressed ; umbo acute, postmesial, 

 but directed somewhat forwards ; anterior side rounded, its upper 

 margin slightly excavated ; hinge-line straight and oblique ; limule 

 small ; ornamented by obtuse, closely arranged, regular rugae, which 

 are slightly undulated on the anal side ; the interstitial spaces very 

 narrow. 



Dimens. Height and lateral diameter equal, or about 1'45 

 millimetre. 



n2 



