73 



Pecten Bednalli, spec. nov. Plate iv., figs. 3a— 3&. 



Shell somewhat triangularly orbicular, slightly convex, 

 rather thin, scarcely equilateral, equivalve ; ornamented with 

 about 24 bundles of two or three subequal ribs, and shagreen 

 -sculpture in the interspaces. Ears very unequal, radially ribbed 

 Colour of left valve purplish, with dashes or blotches of white. 

 Hight valve white, varied with pale flesh colour. 



Dimensions. — Antero-posterior diameter, 28 ; umbo-ventral 

 diameter, 25 ; sectional diameter, 8 millimetres. 



This species is like P. asperrimus in shape and auricles, 

 though it is a little more attenuated dorsally, but differs in the 

 arrangement of the ribs and in the shagreened surface, by 

 which latter character it resembles P. hifrons. The ribs in- 

 crease in number from the umbonal region to the front by re- 

 peated bi- and tri-furcations, and are at first very little raised 

 and plain ; but towards the margin are subangular, and 

 crowned with small prickly serratures (not scales, as in 

 P. asperrimus) . The ribs of each group of two are usually equal 

 in size, but when three are together the middle one is usually 

 stouter. Occasionally a single slender rib is interposed to- 

 wards the front between the bundles. 



Locality.— Aldinga Bay {Mr. W. T. Bednalli) 



Pecten Pulleineanus, spec. nov. Plate iv., figs, la — lb. 



This species is allied to P. asperrimus, but less orbicular and 

 flatter. The ribs are 33 iu number, simple, subacute, crossed 

 by close-set continuous lamella? — not interrupted on the flanks 

 and in the sulci as in P. asperrimus. Anterior ear of right 

 valve very narrow, elongate, radially ribbed ; posterior ear, as 

 in P. asperrimus, six-rayed raised into lamellose scales. 



Dimensions. — Antero-posterior diameter, 23 ; umbo-ventral 

 diameter, 19*5 millimetres. 



Locality. — South-East coast {Mr. B. H. Bulleine !) 



Among other Australian species it makes some approach to 

 P. cruentatus and P. blandus, Reeve, but is not likely to be 

 confounded with them. 



Limea austrina, spec. nov. Plate iv., fig. 7. 



Shell subovate, almost equilateral, very convex, solid, orna- 

 mented, with about twenty radiating nodulose ribs ; the inter- 

 vening sulci are somewhat narrower than the ribs, and are 

 crossed by distant thickish lirse ; umbones prominent, incurved; 

 the hinge margin, on aach side of the sunken broadly triangular 

 ligament pit, is transversely minutely denticulated. 



The outer margin of the valves is bluntly dentate, and the 

 interior is regularly grooved, the furrows corresponding with 

 the external costa?. 



