96 



J.D. TAYLOR AND E.A. GLOVER 



Fig. 1 Cardiolucina agassizi (Michelotti, 1839), middle Miocene (Langhian), St Jean de Marsacq, Landes, France, (coll Lozouet and Maestrati, MNHN ) 

 a, exterior of right valve; b, exterior of right valve; c, interior of left valve; d, interior of right valve. Scale bars a = 750|im, b =700|im, c = 1 .5mm, d = 

 500|im. 



Id). Similar variability of the concentric sculpture is seen in the 

 Recent species C. crassilirata and C. semperiana. 



Distribution. As well as the records of Sacco (1901 ), C. agassizi 

 is also recorded from the Tortonian of the Aquitaine Basin (Coss- 

 mann & Peyrot, 1911) and from the middle Miocene Korytnica 

 Formation of Poland (Friedberg, 1934). 



Material examined. FRANCE: Middle Miocene (Langhian), 

 St Jean de Marsacq, Landes, France; ca 100 shells, Lozouet & 

 Maestrati coll (MNHN). 



Cardiolucina australopilula Taylor and Glover, new 

 species 



Figs 2-6 



Type material. Holotype: WAM reg number 1 10-96: H. 13.6, L. 

 12.8, T. 6.6 mm. Paratypes: WAM 111-96 2 preserved specimens 

 station 35; AM C.202975 1 preserved specimen, station 23; BMNH 

 1996086, 1996087, 1996088, 1 996089 4 preserved specimens, sta- 

 tions 1 , 33, 36, 37; BMNH 1996090 one dry shell station 36. (Station 

 data in Glover & Taylor, 1997). 



TYPE LOCALITY. 9 km north of Beacon Island, Wallabi Group, 

 Houtman Abrolhos Islands, Western Australia, 1 13° 46'E, 28° 23'S, 

 depth 39m. 



Shell description. Shell solid, small, height to 13.8 mm, 

 subcircular in outline, H/L mean 1.03, inflated, orbicular, T/L mean 

 0.47, tumidity to a maximum of 7.5 mm on a single valve. Shell 

 slightly inequilateral, extended anteriorly. Very shallow posterior 

 sulcus. Umbones pronounced, prosogyrate. Lunule extremely small 

 and shallow. Anterodorsal area slightly convex, heart-shaped in 

 outline and with fine concentric ribbing. Escutcheon broadly lan- 

 ceolate, convex and finely ribbed with concentric and a few radial 

 ribs. Exterior sculpture of about 20 radial ribs, rounded in profile, 

 separated by flat interspaces. Anteriorly, interspaces are as wide as 

 the ribs, elsewhere interspaces are about two thirds of the width of 

 radial ribs. Radial ribs have very fine radial striations (Fig. 3d). 

 Radial ribs are crossed by 34-36 thin, low, concentric lamellae and 

 their intersection produces a finely fenestrate ornamentation. Hinge 

 plate thick, left valve with single posterior lateral tooth, two cardinal 

 teeth, the anterior of these is robust and hooked (Fig. 3c) and a single 

 anterior lateral. Right valve with single posterior lateral 



