The Invertebrate Fauna of the Uitenhage Series. 135 



Eripliyla argentina Burckhardt,* from the Neocomian of Las 

 Lajas (Argentine), is also a similar shell, as regards the hinge, the 

 deep lunule and escutcheon, and the development of concentric orna- 

 ments. It differs, however, from A. herzogi by the considerably more 

 elongated figure and the coarseness and spacing of the ornamenting 

 ridges. E. argentina, it may be observed, has a weak pallial sinus, 

 and Dr. Burckhardt remarks that the margin is probably crenulated. 



ASTARTE (EHIPHYLA) PINCHINIANA Tate. 



Plate VII., figs. 6, Qa. 



1867. Astarte pinchiniana E. Tate, Quart. Journ. Geol. Soc., 

 vol. xxiii., p. 157, pi. ix., fig. 7. 



Supplementary Descriptive Note. The shell has a sub-orbicular 

 outline, with rather acutely pointed, anteriorly directed um bones. 

 The lunule is sharply demarcated from the flank, and is of deeply 

 excavated form, bounded outwardly by a sharp ridge which is con- 

 cave in profile. The lunule is of relatively great length. The 

 escutcheon is narrow, deep, and sharply bounded, and is occupied 

 very largely by the ligament space. 



The valve-surface is ornamented during the neanic stage by 

 numerous and closely crowded, very regular and delicate concentric 

 ribs, terminating posteriorly at the margin of the ligament- space. 

 This ornamentation becomes obscure at a distance of 3-5 mm. below 

 the umbo, and subsequently gives place to numerous delicate, raised 

 growth-lines, too irregular to be confounded with definite sculpture. 

 Stronger ridges and furrows of accretion appear in the late adult 

 stage. 



The shell-substance is very thick in relation to the size of the 

 specimens. The interior of the valve-border is strongly crenulate. 



Dimensions. (1) (2) (3) 



Height, measured from the umbo 15 . 18 18 mm. 



Length 15 . 18-5 . 19 



Depth of a single valve 3-5 5 4 ,, 



Number (3) is the specimen figured by Tate. 



Occurrence. Collected by Miss Wilman at Coega Eiver. The 

 specimens in the collection of the Geological Society in London are 

 from the Sunday's Eiver. 



Remarks. Tate's description and figure of this elegant form must 

 appear sufficiently inadequate when it is realised that a most dis- 



* Burckhardt (2), p. 76, pi. xii., figs. 3-6. 



