179 



A few specimens of Saxicava obtained from the basal beds 

 of the marine series of the Older Tertiary, passed through in 

 the Adelaide bore, fall within the limits of variation of the 

 above-named protean shell of world-wide distribution. Also 

 ranging from Miocene to Recent, in New Zealand. 



Panopsea Agnewi, T. Woods. 



Reference. — Lyonsia Agnewi, Tenison- Woods, Roy. Soc, 

 Tasm., for 1875, f. 13, p. 25. 



Transversely-ovate, inequilateral, somewhat solid, convex, 

 concentrically ridged and striated, posteriorly attenuately 

 rounded, anteriorly obliquely produced, and broader ; gaping 

 at both ends. Test minutely granulated in the umbonal re- 

 gions, intricately radially striated on the posterior side towards 

 the margin. 



Dimensions of the type specimen. — Antero-posterior diameter, 

 77 ; umbo-ventral diameter, 44 ; length of anterior side, 27 ; 

 length of posterior side, 50 ; sectional diameter through both, 

 valves, 32 millimetres. 



Locality. — Table Cape (Hobart Mies. ! and P. M. Johnston .') 



Panopa^a orbita, Hutton. Plate xviii., fig. 3. 



Reference — Quart. Journ. G-eol. Soc, vol. 41, p. 451, 18S5. 



Synonym. — P. plicata, Hutton, Cat. Foss., X. Zealand, p. 17, 

 1873 (non Sowerb}^). 



The specific identity of the Australian and Xew Zealand 

 specimens associated under the above name rests on the com- 

 parisons of actual examples. P. orbita is closely related to 

 P. Agnewi, but the latter is more inflated, and of different 

 dimensions. 



Dimensions of the figured example. — Antero-posterior 

 diameter, 85 ; umbo-ventral diameter, 37 ; length of anterior 

 side, 25 ; length of posterior side, 60 ; sectional diameter 

 through both valves, 26 millimetres. 



Localities. — Oyster beds at Aldinga and Adelaide (casts), 

 Middle Murravian series near Morgan, and the correlated beds 

 at Muddy Creek. Also in the Pareora Series, Xew Zealand. 



Capistrocardia, nov. gen. 

 Etymology — Capistrum, a baiter, and cardo, a hinge. Type — C. fragilis, 



spec. nov. 



Shell transverse, equivalve, inequilateral, closed at both 

 ends; ligament external; a cardinal tooth in each valve, and 

 an umbonal rib extending across the interior ; pallial sinus 

 entire, discontinuous. 



The hinge line is very short and narrow. The right valve 

 has a broadish erect tooth contiguous with the umbo, posterior 

 to which is a shallow pit, bounded above by a linear ridge, 



