153 



Tertiary T. Pedemontana, but still distinct, being more 

 regularly oval." 



My notes referring to W. Tateana and reproduced by Mr. 

 Woods, Trans, Roy. So©., N.S.W., bave been by mistake trans- 

 ferred by him to W. Gambierensis. 



Dimensions of a large example : — -Length, 2'4 ; breadth, 15 ; 

 thickness, 1'3 inches. 



Locality and Horizon. — Very abundant in the calciferous- 

 sands occupying the middle portion of the River Murray cliffs 

 about Blanchetown and Morgan ; rare in the red yellow calci- 

 t'erous sandstone forming the upper part of the Mannum cliffs 

 on the River Murray ; River Bremer, four miles south from 

 Callington (Tate). Rather rare in the coralline limestone of 

 Mount Gambier (Woods). Table Cape, Tasmania (R. M. 

 Johnston). 



Waldheimia (?) Crouchii, T. Woods. Plate xi., fig. 8. 



Be/.— Trans. Phil. Soc, Adelaide, 1865, t. 2, fig. 2. 



This species is founded on a brachial valve of nearly circular 

 outline, and with seven large angular plaits on the anterior 

 margin. 



Dimensions. — Length, 23 inches ; breadth, 2'2 inches. 



Locality. — Mount Gambier (Woods). 



Observations. — This appears to be very distinct from its- 

 congeners, but I suspect it to be closely related to W. grandis. 



Waldheimia MacLeani, spec. nov. Plate vii., figs, la— lc. 



Shell large, a little longer than wide, with a sub-pentagonal 

 outline, convex ; greatest width about the anterior third of the 

 whole length, rapidly attenuating posteriorily and gradually 

 narrowing anteriorily to the truncated front margin. Lateral 

 margins narrowly plicate, front margin sinuous. Brachial 

 valve regularly convex and deep, ornamented by a few curved 

 costae, which are limited to near the margin, with an ill-defined 

 medial longitudinal fold bounded by two short depressions. 

 Peduncular valve convex deep, the marginal plications more 

 pronounced and longer than in the brachial valve ; a shallow 

 depression extends from about the middle of the front, where 

 it is bounded by two rounded plaits each equal in width to the 

 depression. Beak moderately produced, sub-erect, truncated by 

 a large circular foramen. Surface of both valves with concentric 

 lines of growth. 



Young shell ovate, without plicae, the line of junction of the 

 valves is in one plane. 



Dimensions in inches : — 



Length. Width. Depth. 



(1.) 1175 1-3 -45 



(2.) 19 1-4 '5 



M 



