140 GEOLOGY AND PALEONTOLOGY OP THE WEST INDIES. 



Localities. — La Cruz and Santiago, Cuba, stations 3439, 3440 (type), 

 3441, Vaughan. 

 Geologic horizon. — Oligocene. 

 Type.—U. S. Nat. Mus. No. 167108. 



Pecten species, cf. Pecten crucianus Cooke. 



Fragments differing slightly in sculpture from P. crucianus, but 

 apparently closely related to it, were found at Crocus Bay, Anguilla. 

 These fragments show no fusion of the concentric lamellae — a charac- 

 teristic of P. crucianus. 



Localities. — Crocus Bay, Anguilla, stations 6893 and 6967. 



Geologic horizon. — Oligocene. 



Pecten (Plagioctenium) gabbi Dall. 

 (Plate 12, Figure 8.) 



Pecten (Plagioctenium) gabbi Dall, Trans. Wagner Inst., vol. 3, pt. 4, p. 717, plate 29, fig. 3, 



1898. 

 Pecten (Plagioctenium) gabbi Brown, Proc. Acad. Nat. Sci., Philadelphia, p. 602, 1913. 



The following is the original description of this species: 



"Shell broad, compressed, oblique, inequilateral, with nearly equal valves 

 and about nineteen concentrically scabrous, longitudinally striated ribs, with 

 narrow interspaces, each filled with one imbricated riblet. 



"Alt. 48, lat. 52, diam. 13 mm." 



The type of this species is said to have come from Antigua. 



A specimen from Anguilla resembles the type in shape, size, and 

 number of ribs, but has lost the outer layers of shell carrying the sec- 

 ondary sculpture. 



Localities. — Antigua, Spencer; Crocus Bay, Anguilla (station 6894), 

 Vaughan. Professor Brown reports this species from Willoughby Bay, 

 Antigua. 



Geologic horizon. — Oligocene. 



Type.—U. S. Nat. Mus. No. 107753. 



Figured specimen. — XL S. Nat. Mus. No. 167101. 



Pecten (Patinopecten) duplex, new species. 

 (Plate 11, Figures 10 a, 5.) 



The following is a description of this species: 



Shell equilateral, large; right valve gently convex, left valve nearly flat; 

 ribs 20, each with a shallow groove on top; ears large, subequal; surface sculp- 

 ture of close-set, concentric, raised lines nearly straight in the interspaces but 

 convex towards the beaks on the ribs. 



Alt., 52 mm.; diam., 11 mm. 



This species, although represented by a single broken specimen, 

 should be easily recognized. Its closest relative seems to be P. healeyi 

 Arnold from the Pliocene of California, which is a much larger species 

 and lacks the grooves on the ribs of the flat valve. 



