34 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, I42 



Figs. 4-7. Agassisia scrobiculafa Valenciennes (p. 23). 



Top, bottom, left-side, and posterior-end views X i of USNM 



638636. From the San Gregorio formation, of Pliocene age, in 

 the Rio Seco area, Falcon, Venezuela. 



Plate 6 



Figs. 1-4. Moira atropos (Lamarck) (p. 22). 



Top, anterior-end, posterior-end, and bottom views X i of USNM 



638637. From the San Gregorio formation, of Pliocene age, in 

 the Rio Seco area, Falcon, Venezuela. 



Figs. 5-6. Encope michelini Agassiz (p. 17). 



Top and right-side views of USNM 638631. Probably from the 

 San Gregorio formation, of Pliocene age, in Sucre, Venezuela. 



Plate 7 



Figs. 1-4. Brissus nnicolor (Leske) (p. 27). 



Top, right-side, posterior-end, and bottom views X i of USNM 

 638641. From the Springvale formation, of late Miocene age, 

 of Savanetta, near Gran Couva, Trinidad. 



Fig. 5. Encope michelini Agassiz (p. 17). 



Bottom view X i of USNM 638631. Probably from the San 

 Gregorio formation, of Pliocene age, in Sucre, Venezuela. 



Plate 8 



Fig. I. Encope secocnsis Cooke, n. sp. (p. 18). 



Top view X I of holotype, USNM 638634. From the San Gre- 

 gorio formation, of Pliocene age, in the Rio Seco area, Falcon, 

 Venezuela. 



Figs. 2-4. Encope (Melitclla) falconensis Cooke, n. sp. (p. ig). 



Top, bottom, and right-side views X i of holotype, USNM 

 638633. From the Chiguaje formation, of late Miocene age, in 

 the Rio Seco area. Falcon, Venezuela. 



Plate 9 



Figs. 1-2. Encope secocnsis Cooke, n. sp. (p. 18). 



Bottom and right-side views X i of holotype, USNM 638634. 

 From the San Gregorio formation, of Pliocene age, in the Rio 

 Seco area, Falcon, Venezuela. 



Figs. 3-5. Echinolampas lycopcrsicits Guppy (p. 21). 



Top, left-side, and bottom views X i of USNM 11587a. From 

 the Anguilla limestone, of middle Miocene age, in Anguilla, 

 B.W.I. Figured also by Jackson (1922, pi. 11, figs. 3-5). 



Plate 10 



Fig. I. Encope kugleri Jeannet (p. 18). 



Top view X I of USNM 638632. From the Chiguaje formation, 

 of late Miocene age, in the Rio Seco area, Falcon, Venezuela. 



