116 



J.D. TAYLOR AND E.A. GLOVER 



Fig. 26 a-b, Cardiolucina sp. Corregidor, Philippines (USNM 294200); c, Cardiolucina sp Sibugay Island, Masbate, Philippines (USNM 29266). Scale 

 bars a = 400um, b = 500|im, c=lmm. 



lamellae. Hinge plate thick. Left valve with single, hooked anterior 

 lateral tooth, two cardinals and single posterior lateral tooth. Right 

 valve with similar. Indentations on both anterior and posterior 

 margins which correspond to the position of sulci. Inner margin with 

 about 40 crenulations. Anterior adductor muscle scar elongate, not 

 buttressed. Pallial line attached to lower third of anterior adductor 

 muscle scar. Posterior adductor scar reniform in outline. Pallial line 

 continuous. Shell colour grey-white. 



Comparison with other species. This species is similar to C. 

 rehderi but has a greater number of fine radial ribs. 



Habitat. Fine muddy sand from 4-200 m. 



Distribution. Senegal to Northern Angola (Fig. 28). 



Material examined. AFRICA: Guinea, Los Islands (NMW 

 1955.158). 



Cardiolucina rehderi (Britton, 1972) 

 Fig. 27 c & d 



Parvilucina (Bellucina) rehderi Britton, 1972: 7-9, fig. 3. 

 Lucina (Parvilucina) rehderi (Britton) - Rios, 1994: 252. 



Type material. Holotype, USNM 208255, L = 4.2 mm, H = 4.2 

 mm, T = 4.1 mm (paired valves), also 9 paratypes. 



Type locality. Brazil, no further details. 



Shell description. Shell small, height to 4.2 mm. Subcircular; 

 moderately inflated, maximum tumidity on a single valve to 1 .9 mm. 

 Inequilateral, slightly extended anteriorly. Broad posterior sulcus. 

 Posterior dorsal area slightly convex, with distinct elevation of 

 concentric lamellae. Shallow anterior sulcus, anterior dorsal area 

 indistinct. Lunule shallow, heart-shaped. Exterior sculpture of about 

 30 indistinct radial ribs most clearly visible in the interspaces 

 between concentric lamellae, ribs separated by shallow, narrow 

 interspaces. Concentric lamellae, 14—16, prominent, thickened la- 

 mellae often appear scalloped at position of intersection with radial 

 ribs. Hinge plate thickened. Left valve with single anterior lateral 

 tooth; two cardinal teeth and single posterior lateral. Right valve 

 with similar. Ligament short, extending about half distance from 

 beak to posterior lateral tooth. Inner margin with about 20 fine 

 crenulations. Anterior adductor muscle scar longer than wide but 

 relatively short with pallial line joining near ventral tip. Posterior 

 adductor muscle scar rounded. Shell colour white. A more extensive 

 description of this species is given by Britton (1972). 



Comparison with other species. This species is closely similar 

 to C. lamothei. 



Habitat. Unknown. 



