204 Bulletin 29 368 



Phacoidcs (Lucinisca) kispa?iiolana, n. sp. 

 Plate 35, Figure 4 



Shell orbicular, slightly convex, beaks small, acute, directed 

 forwards. The species is remarkable for its exquisite sculpture 

 which is of the same type as that exhibited by P. calhounsis 

 Dall, from the Chipola Oligocene, but more delicate, more varied 

 and ornate. The concentric sculpture on intersecting the radial, 

 rises into minute spinose beads. The umbo shows no radial 

 sculpture only very close, fine, concentric lines ; primary radials 

 then appear. On the center of the valve each pair of heavier, 

 primary, radial ribs alternates with two finer secondary riblets 

 which on approaching the basal margin become subequal to the 

 primaries. The ribs near the dorsal posterior margin are distinct- 

 ly squamose. Hinge normal, with two strong lateral teeth and 

 one cardinal tooth. Length 1 1.75, approximate altitude 11, 

 semidiameter 3 mm. A rare and lovely shell. \ 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao. 



Phacoides (Lucinisca) cercadica, n. sp. 

 Plate 35, Figure 5 



Shell resembling P. hispaniolana in miniature but with a 

 bolder sculpture ; beaks and part of the umbo with only close, 

 concentric lamellae ; radial ribs then appear ; the ribs are well 

 spaced, subequal, with a single, finer, secondary rib alternating 

 with each primary pair ; the intersections of the concentric and 

 radial sculpture are beaded, and the ribs defining the umbonal 

 ridge and anterior and posterior dorsal margins are. all three 

 squamose at the intersections. Hinge rather wide ; right valve 

 with a cardinal and two strong lateral teeth ; left with two 

 cardinals. Length of largest shell 6, altitude 5.50 mm. 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao. (Not 

 scarce). 



Phacoides (Miltha) Smithwoodwardi, n. sp. 

 Plate 35, Figure 6 

 Shell sub-quadrilateral, flattened ; beak very acute, curving 



