144 



of New Zealand ; and I have reason for the opinion that when 

 a careful comparison shall have been instituted between tbe 

 fossils of the Eocene of New Zealand and those from the 

 Aldinga beds great specific identity will be found to obtain. 



Description of Species. 



Terebratula vitreoides, T. Woods. Plate viii., fig. 5a 5b. Plate x., 



fags, la— lb. 



Bef.— Trans. Koy. Soc. New South Wales, 1878, p. 78, 

 figs. 4a — d. 



" A small, smooth, orbicular species, with very conspicuous 

 concentric lines of growth. Foramen small. Of this fossil 

 Mr. Davidson says — ' This is another of those undecided forms 

 that resemble many things described as distinct species. It 

 has some resemblance to T. vitrea or to 1. orbicularis, Sequenza, 

 I would not like to assign it positively to any species, although 

 I would not assign to it any very distinguishable features.' " — 

 T. Woods. 



The specimen which I have figured Plate viii., fig. 5, under 

 the above name is one of a small series from the lower beds at 

 Aldinga, agreeing very well with Woods' description and 

 figures, except that the foramen is usually larger. Of the 

 Aldinga examples I have not been able to dissect out the 

 interior ; but somewhat similar shells from the Kiver Murray 

 cliffs prove to have the loop of a Terebratula, see plate x., 

 fig. 7. Of the latter I have only been successful in collecting 

 three examples, all of which are smaller than the Aldinga 

 specimens, and differ in being more gibbous with depressed 

 sides, and in having a smaller foramen, characters which 

 approximate it more to T. vitrea, Born., whilst the Aldinga 

 specimens make an approach to T. elliptica, Sequenza. The 

 differences, which may be due to age, are too slight to justify 

 the specific separation of the two forms. 



The loop of T. vitreoides differs from that of T. vitrea in being 

 relatively shorter and stouter, the breadth of the curved front 

 portion is much greater, and the crural processes are incon- 

 spicuously developed. 



Dimensions. — A large specimen from Aldinga has the follow- 

 ing measures : — Length, T45 ; breadth, T05 ; thickness, '7 inch. 

 One from the Murray cliffs : — Length, 1*0 ; breadth, S ; 

 thickness, "5 inch. 



Locality and Horizon. — Lower Aldinga — glauconitic lime- 

 stones, Blanche Point, Aldinga Bay ; and Middle Murravian, 

 calcareous sands at Blanchetown. (Tate). 



Table Cape, Tasmania. (R. M. Johnston). 



Terebratula Aldingae, spec. nov. Plate x., figs. 2a— 26. 

 Shell obtusely five-sided ; a little longer than wide ; broadest 



