NO. 4 ECHINOIDS, TRINIDAD AND VENEZUELA — COOKE 25 



PERICOSMUS STEHLINI Jeannet 

 PI. 13, figs. 3-6 



Pericosmns stchlini Jeannet, 1928, Soc. Paleont. Suisse Mem., vol. 48, p. 43, pi. 4, 

 figs. 21-24. 



Horizontal outline subovate, emarginate in front, truncated behind ; 

 upper surface inflated ; lateral profile highest near the front, steeply 

 curved downward in front, more gently behind, nearly straight below. 

 Apical system slightly anterior ; three genital pores, the right an- 

 terior pore wanting; ethmolytic. Anterior ambulacrum not at all 

 petaloid ; moderately depressed, the depression extending the full 

 length, weakest near the peristome. Paired petals deeply sunken, 

 widely spreading, the anterior pair the longest, extending nearly to 

 the margin ; poriferous zones wider than the interporif erous ; inner 

 pores circular, outer pores somewhat elongated; pores conjugate. 

 Peristome near the anterior fifth, semilunate, weakly lipped. Periproct 

 broadly oval, transverse; at the top of the posterior truncation; 

 slightly overhanging. Peripetalous fasciole deeply indented in the 

 posterior and interambulacral areas. Marginal fasciole slightly un- 

 dulate, curved down under the periproct. Tubercles of medium size, 

 somewhat smaller on the top. 



Length of figured specimen 56 mm. ; width 54.5 mm. ; height 37 

 mm. Another specimen measures 66 by 60 by 41 mm. 



Occurrence. — Venezuela: Coro, Falcon (type, fide Jeannet). La 

 Vigia, 10 km. southwest (southeast?) of Pueblo Nuevo, Paraguana 

 district. Falcon (Creole Petroleum Co. 7824). 



Geologic horizon. — Miocene : Probably "Damsite series," of middle 

 (?) Miocene age (type, jide Jeannet). Le Vela formation, of late 

 Miocene age. 



Holotype. — Naturhistorisches Museum, Basel, Switzerland. 



Figured specimen. — USNM 638638. From La Vigia. 



LOVENIA cf. L. DUMBLEI Kew 

 PI. 13, fig. 2 



Cf. Lovenia dumblei Kew, 1917, California Acad. Sci. Proc, ser. 4, vol. 7, No. 5, 

 p. 136, pi. 17, figs. 2a-c. 



One defective Lovenia should be compared with Lovenia dumblei 

 Kew from the Miocene (?) of Mexico at Rancho Nuevo, 35 km. 

 northwest of Tuxpan. It is proportionately longer and narrower than 

 the holotype as figured by Kew (fig. 2a) and differs further in that 



