Bulletin ?q 



Pecten {s^Equipeden) scissuratus Dall 



Pecten (JEquipecten) scissuratus Dall, Trans. Wagner Inst., vol. 3, pt 

 4, p. 715, pl. 34, fig- 4- 1898. 



Shell moderately compressed; valves nearly equilateral; ribs 

 sixteen; ears small, subequal. Altitude 31, length 30, diameter 

 6 mm. 



Described from Ponton, Santo Domingo, and also found 

 near Colon, Isthmus of Darien. 



Peden vaginulus Dall 

 Plate 34, Figure 7 

 Peden ( Chlamys) ornatus Lamarck ? var. vaginulus Dall, Trans. Wag- 

 ner Inst. Sci., vol. 3, pt. 4, p. 715, 1898. 

 Our shell has been examined by Dr. Dall and pronounced 

 identical with the type of P. vaginulus, an unfigured species de- 

 scribed from Bowden. Our specimen has twenty- three ribs with 

 a distinct radial thread in every interspace; ears very unequal. 

 Length of right valve 15, altitude 16, semi-diameter 3 mm. This 

 species is smaller than Gabb's P. interlineatus and has more 

 numerous ribs. 



Locality. — (Exp'd'16) Samba Hills at an approximate alti- 

 tude of 540 feet. 



Pecten {Chlamys) cadaceus Dall 



Pecte7i (Chlamys) cadaceus Da\\, Trans. Wagner Inst. Sci., vol. 3, pt. 4, 

 p, 716, pl. 34, fig. 2, 1898. 



A thin, fragile shell, nearly equivalve, with ten to twelve 

 narrow ribs and wider shallow interspaces with radial threads ; 

 whole surface squamose. Altitude 47, length 46, diameter 8 mm. 

 Reported by Dall from the Tertiary of Santo Domingo and the 

 Pliocene of Tehuantepec. It is simply mentioned here as one of 

 the few figured Dominican Peclens, but is not represented in our 

 collections. 



Pecten {Nodipedeii) nodosus Linne 



Pecten nodosus Dinne, Syst. Nat., No. 164, 1758. 



Pecten magnificus Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 256, 1873. 



