of Waldheimia and Terebratella. 19 



shell beyond the impressed line on the surface of the dorsal 

 valve representing the mesial septum, its exact generic affinity 

 must remain an open question, although it is in all probability 

 a Waldheimia or Terebratella. The specimen was forwarded 

 to Mr. Davidson, who was kind enough to suggest its reference 

 to the former subgenus. I name the species after my friend 

 and former colleague Mr. Norman Taylor, of the Victorian 

 Geological Survey and Mining Department. 



Log. and Horizon. Coralline Limestone of the Murray-River 

 Cliffs, near the Great Bend, S. A. Blanford Collection, 

 Mus. Pract. Geology ^ London. 



Waldheimia (jambierensis, sp. nov. (PI. 11. figs. 4 a-d.) 



Sp. char. Shell elongate, much longer than wide, somewhat 

 fig-shaped, notched in front, valves convex. Ventral valve the 

 larger and more convex of the two, obtusely biplicated towards 

 the front, with a short shallow sulcus between the plaits, and 

 two similar lateral ones corresponding to two ill-defined lobes 

 in the dorsal valve ; beak moderately produced, truncated by 

 an oblique large circular foramen, encircled by the apex of the 

 beak and the delitidium. Dorsal valve convex in the median 

 and umbonal regions, produced more or less towards the front, 

 with a broad median longitudinal plait, only apparent near the 

 front margin, bounded by two short lateral sulci, corresponding 

 to the two previously mentioned plaits of the ventral valve. 

 Lateral margins curved ; front margin sinuated. Surface of the 

 shell marked with concentric lines of growth. An impressed 

 line, showing the position of the mesial septum, extends for 

 six lines along the surface of the dorsal valve from the umbo, 

 and can be traced still further as a dark line under the shell. 

 Length 2 inches, width 1 inch 3f lines, depth 1 inch 1 line. 



Obs. With the exception of the median septum, as previously 

 indicated, we are not acquainted with the internal characters of 

 this species ; the position of the mesial septum is shown, as in 

 W. Taylori, by an impressed line on the dorsal valve from the 

 umbo forwards. 



Loc. and Horizon. Coralline Limestone of Mount Gambier. 

 Cabinet of Mr. T. Davidson, F.Ii.S. 



Genus Terebratella, D'Orbigny. 



Terebratella compta, G. B. Sowerby. (PL II. figs. 5 a-d.) 



Terebratula, sp., Stui-t, Two Expds. Int. S. Austr. 1832, ii. t. 3. f. 15. 

 Terebrafida compta, G. B. Sow. Strzelecki's Phys. Descr. N. S. Wales 



and V. D. Land, 1845, p. 297, t. 19. f. 4 ; Woods, Geol. Obs. S. Austr. 



1862, p. 74, woodcut. 



8p. char. Shell trapeziform, slightly longer than wide ; 



2* 



