142 



The living analogues of this fossil species are B. lima, Reeve, 

 and B. decussata, Sby. From the first it differs in its coarser 

 ornament, particularly on the less angular posterior slope, and 

 in its longer posterior side. From the second, with which it 

 iigrees well in ornament and in general shape, it differs by its 

 longer and straighter hinge-line, longer posterior side, and by 

 the stronger and more laminar and oblique teetli on the mar- 

 ginal areas. 



Barbatia consutilis, spec. iiov. Plate ii., fig 15. 



Shell elongate-oval, moderately convex, medially impressed ; 

 umbones subanterior, incurved, close together ; anterior side 

 short, rounded; posterior side elongated, attenuated, obliquely 

 truncated. Surface radiately fine ridged, more or less granulose 

 where crossed by the equidistant concentric threads ; the worn 

 surface regularly tessellated. 



DMiiensions of a large specimen. — Length, 41 : width, 20 ; 

 thickness through both valves, 16 millimetres. 



Locality. — Common at Muddy Creek. 



Similar to B. limatella, but especially distinguished by its 

 attenuate posterior side. 



Barbatia simulans, spec, nov. Plate xi., fig. 10. 



Shell transversely trapezoidal, moderately inflated, very 

 inequilateral, umbones anterior, incurved, close together ; 

 anterior margin very short, obtusely roundly truncate, posterior 

 side elongated, obtusely truncated with a well-defined posterior 

 slope ; hinge-line straight ; ventral margin inconspicuously 

 insinuated. Surface with flattish granular ridges wider than 

 the interspaces. Hinge area very narrow, with about seven 

 divaricating cartilage furrows ; teeth numerous, transverse, 

 becoming more oblique towards the extremities. 



Dimensions. — Length, 34 ; width, 19 ; thickness through both 

 valves, 14 millimetres. 



Localities. — Muddy Creek, Hamilton ; oyster banks, !N'orth- 

 "West Bend, on the R. Murray. 



This species is closely related to B. lima and B. limatella 

 from which it is distinguished by the shorter anterior side, 

 obtusely truncated, and by its granular ornamentation most 

 conspicuously so on the posterior slope. B. limatella wants 

 the posterior angulation of this species. 



Barbatia pumila, spec. nov. PI. x., fig. 7. 



Shell small, ovate-oblong, moderately convex, inequilateral; 



umbones anterior, rather broad, obtuse, approximate ; anterior 



-side short, rounded ; posterior side depressed, subangular, its 



margin obtusely roundly truncate; dorsal and ventral margins 



