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PROCEEDINGS OF THE NATIONAL MUSEUM 



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Table 1 shows the localities and the geologic horizons of the species 

 found in the collection. 



Table 1. — Localities and geologic horizons of species of Mexican fossil Echini 



recorded in this paper 



Dickerson and Kew have published a paper ^ in which Kew, who 

 is the author of the echinoid portion, recognized 12 species of Echini, 

 four of which were described as new. Merle C. Israelsky ^ described 

 six new species of Echini from Mexico and recorded in all 13 species 

 from that region. Errors in localities as cited by Israelsky are cor- 

 rected in a book by J. M. Muir.^ Additional fossil Echini from 

 Mexico are included in a paper by the veteran echinologist M. Jules 

 Lambert,^ who had only a limited amount of material, some 12 

 specimens, which he referred to eight species, three of which were 

 described as new. 



In the material on which the present paper is based 13 species are 

 recorded, six of which are new. In all, 32 species have been recorded 

 from Alexico, 18 of which were described as new. 



* The faima of a medial Tertiary formation and the associated horizons of northeastern Mexico. Proc. 

 California Acad. Sci., ser. 4, vol. 7, no. 5, pp. 125-156, pis. 17-26a, 1917. 



' Notes on some echinoids from the San Rafael and Tiixpan beds of the Tampico region, Mexico. Proc. 

 California Acad. Sci., ser. 4, vol. 13. no. 8, pp. 137-145, pis. 2-4, 1924. 



* Geology of the Tampico embayment, xix4-280 pp., illus. American Association of Petroleum Geologists, 

 1936. 



* Note sur quelques Echinides recueillis par Mr. Walter Staub dans le Nfiogene de I'Est do Mexique. 

 Eclog. geol. Helv., vol. 21, no. 1, pp. 272-283, 6 figs., 1 pi., 1928. 



