167 



way between the adductor scars, and is quite free from the 

 pallial line. 



Dimensions. — Antero-posterior diameter, 10 ; umbo-ventral 

 diameter, 6 ; sectional diameter of both valves, 35 milli- 

 metres. 



Locality. — Xot uncommon in the lower beds at Muddy 

 Creek. 



Species-name in compliment to Mr. James Stirling, F.Gr.S., 

 F.L.S., who has so ably described the physiographic features of 

 the Victorian Alps in a long series of papers communicated to 

 several Scientific Societies. 



Strigilla australis, spec. nov. Plate xix., fig. 6. 



Oval, compressed, thin, shining, inequilateral, the posterior 

 side being the longer ; umbo small, acute. The sculpture con- 

 sists of incised lines, which, as regards direction, are grouped 

 in three distinct regions — (1) On the anterior side they are 

 transverse, more or less coincident with the margin, becoming 

 (2) oblique on the median portion, those nearest the front 

 being abruptly bent, the included angle widening towards the 

 umbones ; (3) the narrow post-dorsal area is covered with 

 numerous oblique striae, interrupted by the posterior lines of 

 the middle region, and making with them acute angles, di- 

 rected ventrally. The umbonal region has concentric stria? 

 only. The left valve has one bifid cardinal tooth and an ap- 

 proximate lateral denticle on each side. 



Dimensions. — Antero-posterior diameter, 9'5 ; umbo-ventral 

 diameter, 7'5 millimetres. 



Locality. — Lower beds at Muddy Creek. 



Psammobia Hamiltonensis, Tate. Plate xvi., fig. 13. 



Reference. — Southern Science Record, January, 1885, p. 4. 



Shell shining, compressed ; transversely elliptical, attenuated 

 anteriorly, and obliquely truncated posteriorly ; sculptured 

 with incised lines concentric with the margin, which become 

 rugae on the angulated posterior area. 



The fossil closely resembles the living JP. zonalis, Lk., from 

 which it differs in being narrower, more attenuated anteriorly, 

 and less abruptly truncated posteriorly. The post-dorsal line 

 is not so straight, and the post-ventral margin is a little more 

 ascending, so that the posterior margin is more attenuated and 

 less abruptly truncated ; the anterior margin is also more pro- 

 duced. 



Dimensions. — Antero-posterior diameter, 31 ; umbo-ventral 

 diameter, 15 millimetres. 



Localities. — Common in the upper beds at Muddy Creek, 

 Hamilton (B. T.) ; Table Cape (JR. M. Johnston !) 



