151 



Beak largish, suberect, and truncated by a large foramen. 



Loop unknown. 



This species has much affinity with W. Tateana, particularly 

 with the biplicated variety of it, but the more pronounced 

 costations and the larger foramen separate it. 



Dimensions. — Length, "9 inch ; breadth, "7 inch ; depth, *55 

 inch. 



Locality and Horizon. — Grlauconitic limestones, Blanche 

 Point, Aldinga Bay (a few examples). 



Waldheimia (?) Johnstoniana, spec. nov. Plate viii., figs. 9a— 9&. 



Shell elongate, oval, subpentagonal ; much longer than wide, 

 with nearly parallel sides, attenuating somewhat rapidly to the 

 beak, but truncated in front. Front margin binsinuate, the 

 sulci shallow and very short, flanked on each side by faint 

 plicae. 



Valves about equally and regularly convex, not inflated. 

 Surface smooth, with a few inequidistant concentric lines of 

 growth. Test minutely and densely punctate, visible under a 

 pocket lens. 



Beak short and stout, erect, transversely truncated hy a 

 rather large circular foramen ; deltidial pieces small, fused 

 together ; beak ridges inconspicuous. 



Loop unknown, but the brachial valve shows a strongly 

 impressed medial line. 



Dimensions. — Length, 1*2 ; breath, - 7 ; thickness, *6 inch. 



Observations. — It is allied to W. Tateana, through the bipli- 

 cated variety of that species, but is relatively longer and 

 narrower, and its foramen is much larger, and the beak shorter 

 and stouter. 



Locality and Horizon. — Grlauconitic limestone, north side of 

 Blanche Point, Aldinga Bay (nine examples). 



The species is named after Mr. R. M. Johnston, F.L.S., to 

 whom Australian geologists are indebted for much of their 

 knowledge on the Miocene fauna and geology of Table Cape, 

 Tasmania. 



Waldheimia (?) insolita, spec. nov. Plate ix., figs. 6a— 6&. 



Shell oval, nearly as long as wide ; sides and front margins 

 curved ; valves moderately convex ; surface smooth, with a few 

 concentric lines of growth. 



Beak small, erect, depressed, with strong beak ridges, 

 ohliquely truncated by a rather small circular foramen. 

 Deltidial pieces well-developed. 



Loop that of Waldheimia, septum about one-third the length 

 of the brachial valve. Punctations of test visible under a 

 pocket lens. 



