141 



Locality. — Oyster beds of the Eiver Murray cliffs at the- 

 North- West Bend. 



Has a resemblance to Area equidens, mibi, but with a coarser 

 ornament, shorter posterior side, &c. 



Barbatia celleporacea, spec, nov. PI. x., fig. 10. 



Shell elongate- oblong, rather compressed, inequilateral ; 

 anterior side short, narrow, acutely angular ; posterior side 

 elongated, obtusely angular, with the posterior slope carinated; 

 ventral side slightly sinuated. Hinge line straight. TJmbones 

 anterior, approximate, depressed, acute. Surface ornamented, 

 with concentric folds raised into frills ; the latter in aged- 

 specimens pass into uncinate scales or hollow tubercles, the 

 fimbriations within the interstitial spaces not infrequently per- 

 forated, the entire ornamentation simulating a polyzoal growth, 

 as in Gellepora. The concentric folds show coarse distant 

 growth lines. Internal margin strongly crenulated ; ligamen- 

 tal area very narrow ; teeth small, numerous in a transverse 

 series, increasing in size and becoming slightly oblique towards 

 the extremities. fa 



Dimensions of a large specimen : — G-reatest length, 26 ; 

 width, 10 ; thickness through both valves, 7' 5 millimetres. 



Localities. — Victoria : Common at Muddy Creek ; Schnapper 

 Point {ll.T.y Tasmania: Table Cape {B. M. Johnston!). 



This species has much resemblance to Barhatia {Acar) 

 laminata, Angas, inhabiting South Australian waters, and 

 therefore to Area squamosa, Lamk., but it is more elongate, not 

 so tumid, with narrow acute umbones, and the front margin 

 more angular. 



Barbatia limatella, spec. nov. Plate x., fig. 2. 



Shell elongate suboval, moderately inflated, inequilateral ;. 

 umbones subanterior, incurved very close together ; anterior 

 side short, rounded ; posterior margin obliquely roundly trun- 

 cated ; hinge-line straight ; ventral margin straight or slightly 

 arcuate, slightly insinuated medially. Surface radiately fine- 

 ridged, dichotomously dividing, more or less granulose or scaly 

 where crossed by the numerous equidistant imbricating folds ;. 

 the depressed posterior slope conspicuously radiately ridged. 

 Hinge area very narrow, almost wanting in young specimens, 

 divaricately furrowed; central teeth numerous, small, trans- 

 verse, with a few short, oblique, fold-like teeth towards the 

 extremities. 



Dimensions of a large specimen. — Length, 50 ; width, 28 ; 

 thickness through both valves, 19 millimetres. 



Localities. — Sandy clays at Blanche Point, Aldinga Bay, and 

 argillaceous glauconitic sands, Adelaide bore. 



