28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I42 



rated by a bead. Anterior paired petals depressed, widely spreading, 

 extending three-fourths of the way to the margin, wide; anterior 

 pores much reduced near the apical system. Posterior petals de- 

 pressed, longer than the anterior pair, adjacent and confluent near the 

 apical system, spreading apart distally ; pores large, oval. Peristome 

 near the anterior quarter, strongly lipped. Periproct vertically elon- 

 gated, near the top of a posterior truncation. Peripetalous fascicle 

 deeply indented except in front; subanal fasciole reniform. 



Length of largest cotype (from Antigua) 47 mm.; width 38 mm. ; 

 height about 18 mm. Length of figured specimen (from Venezuela) 

 62 mm. ; width 47 mm. ; height 23 mm. 



Occurrence. — Venezuela : Paraguana Peninsula 10 km. southeast 

 of Pueblo Nuevo, Falcon (Creole Petroleum Co. 7824). 



Geologic horizon. — Miocene: La Vela formation, of late Miocene 

 age. The types are from the Anguilla formation, of middle Miocene 

 age. 



Cotypes.—US^yi 11 5406. 



Figured specimen. — USNM 638640. 



PLAGIOBRISSUS GRANDIS (Gmelin)? 



PI. 13, fig. I 



Echinus grandis Gmelin, 1791, Linne, Systema naturae, vol. i, pt. 6, p. 3200. 

 Plagiohrissus grandis (Gmelin). Mortensen, 1951, Monograph of the Echinoidea, 



vol. 5, pt. 2, p. 496, pis. 40-41 ; pi. 63, figs. 13, 16. 

 Plagiohrissus grandis (Gmelin). Cooke, 1959, U. S. Geol. Surv. Prof. Pap. 321, 



p. 86, pi. 39, figs. 1-2; pi. 40, fig. 6. 



One fragment showing most of the right posterior quadrant of the 

 upper surface, most of the escutcheon and subanal fasciole, and part 

 of the lateral lower surface agrees in all recognizable features with 

 the Recent Plagiohrissus grandis of the West Indian region. The 

 escutcheon is semicircular in front, like the Recent species, differing 

 in this respect from Plagiohrissus lamherti Jeannet (1928, p. 38, pi. 

 5, figs. 1-2; pi. 6, figs. 13-14; text fig. 12) from the "couches d'Ojo 

 de Agua" on the road from Guaidima to Riecito (Falcon) as figured 

 by Jeannet, which is pointed. 



Occurrence. — Venezuela : Paraguana Peninsula 10 km. southeast of 

 Pueblo Nuevo, Falcon (Creole Petroleum Co. 7824). 



Geologic horizon. — Miocene? 



Figured specimen. — USNM 638642. 



