NO. 4 ECHINOIDS, TRINIDAD AND VENEZUELA — COOKE 1 5 



the peristome ; margin evenly rounded. Apical system central ; four 

 genital pores, the anterior pair closer together than the posterior pair ; 

 madreporite central. Petals long, extending nearly to the margin, sides 

 straight, wide open at the distal ends ; poriferous zones much narrower 

 than the interporif erous ; pores circular or oval, conjugate. Extrapet- 

 aliferous pores nearly linear except in the peristomial depression, 

 where the two zones are adjacent and the pore pairs are nearly trans- 

 verse. Peristome central, subquadrate, with shallow notches at the 

 paired ambulacra and a very shallow notch at the anterior ambulacrum. 

 Periproct small, transversely oval or round, flush; near the posterior 

 third of the radius. Tubercles sunken, covering the entire surface 

 except the poriferous zones. 



Length of holotype 42 mm.; width ^^ mm. ; height 18 mm. 



Occurrence. — Trinidad: San Fernando (USNM 115389, 115409, 

 R. J. L. Guppy). Bella Vista Road, Mount Moriah, San Fernando 

 (USGS 8878, 9201, J. A. Bullbrook). 



Geologic horizon. — Late Eocene : San Fernando formation. 



Holotype. — USNM 115392a. 



Figured specimens. — USNM 115392a, 115392b, 638628. 



Remarks. — Guppy published four figures ostensibly representing 

 Echinolampas oviim-serpentis. The original of his figures 4a and 4b, 

 now USNM 115389a, was figured by Jackson (1922, pi. 10, fig. 4) 

 as a cotype. This specimen was selected by H. L. Clark (Arnold and 

 Clark, 1927, p. 36) as the holotype of Echinolampas ovmn-serpentis, 

 which became the type species of their new genus Pauropygus. 

 Guppy's figure 5 is not recognizable. The original of his figure 6 

 (USNM 115409a, now broken) appears to represent Oligopygus 

 rotundus Cooke. 



Arnold and Clark (1934, p. 143) reported that their Pauropygtis 

 elevatiis is a synonym of Haimea caillaudi Michelin. This identifica- 

 tion is open to question because the periproct of H. caillaudi is shown 

 in Michelin's drawing (Mortensen, 1948, text fig. 248b) as nearer 

 the peristome, farther from the margin than that of Arnold and 

 Clark's photograph of Haimea clevata, which probably is an unusually 

 plump variety of Haimea ovum-serpentis. If Haimea elcvata really 

 is a synonym of H. caillaudi and if it represents the same species as 

 Haimea ovum-serpentis, then the name Haimea caillaudi takes prece- 

 dence over both. 



Haimea ovum-serpentis is abundant in St. Bartholomew and in 

 Jamaica. Egozcue y Cia (1897) and Sanchez Roig (1949, p. 167) 

 report it also from Cuba. Jeannet (1928, p. 12) describes a fragment 



