156 MESOZOIC AND CENOZOIC ECHINODERMATA OF THE UNITED STATES. 



The peristome is large, semilunar, and distinctly excentric forward. The periproct is 

 large, high on the posterior truncation. 



Locality. — Santee Canal, S. C. 



Geologic horizon. — Santee marl member of McBcan formation, of Claiborne group, middle 

 Eocene. 



Collection. — American Museum of Natural History. 



Spatangus? pachecoensis (Pack). 



Spatangus ? pachecoensis Pack, 1909, Univ. California Dept. Geology Bull., vol. 5, No. 18, p. 276, PI. XXIII, figs. 4, 5. 

 Spatangus ? pachecoensis Lambert, 1910, Bev. crit. paleozoologie, 4 e annee, No. 1, p. 55. 

 Spatangus ? pachecoensis Stefanini, 1911, Soc. geol. italiana Boll., vol. 30, p. 705. 



Description. — The species was established by Pack on casts of poorly preserved fragments. 

 It apparently belongs to the Spatangidse, but its generic relations can not be determined. 

 Lambert, on the other hand, positively refers it to the Scutellidas and considers the material 

 too fragmentary for specific description. 



Locality.— Northwest of Pacheco, Contra Costa County, Cal. 



Geologic horizon.— Tejon formation, upper Eocene. 



Collection. — University of California. 



