Cooke, C. W. 1955. Some Cretaceous echinoids from the Americas. United States Geological Survey Professional Paper 264 E, 87-112.
169072
Cooke, C. W.
1955
Some Cretaceous echinoids from the Americas
United States Geological Survey Professional Paper
264: 87-112
Publication
from Kier & Lawson (1978)
Includes descriptions of Hemiaster texanus from the Napo series in Ecuador and echinoid faunas (including new species) from Cretaceous localities in Colombia.