234 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



Kew figures a specimen as A. clevei as noted above. This specimen 

 Israelsky ^ makes the type of a new species, A. regia, and compares 

 this with A. inflata Jackson, which by error he calls A. elevata Jackson. 

 A. clevei differs from A. regia in being proportionately narrower 

 laterally and less expanded anteriorly. 



Mes6n, Sahtre Ranch, Mexico; Cummins and Sands, collectors, 

 1909; California Academy of Sciences, locaHty X 24, two specimens. 



Genus SCHIZASTER Agassiz 



SCmZASTER CRISTATUS Jackson 



Schizaster crisiatus Jackson, Proc. U. S. Nat. Mus., vol. 53, p. 499, pi. 68, figs. 

 2-4, 1917. 



S. cristatus differs from S. dumhlei Israelsky ^ in being more com- 

 pressed laterally and more liighly carinate posteriorly. 



The species cristatus, described from Brazil, Costa Rica, is repre- 

 sented by a number of excellent specimens from Mexico: 



Oligocene, Mes6n, locaUties: Horizon "M", Transcontinental Rail- 

 road, lot 145 Hacienda Chinampa, 8 km east of the town of Chinam- 

 pa. Canton Tiixpan, Veracruz; also in lot 214, Hacienda Chinampa, 

 D. R. Semmes, collector, June 1920, one specimen; station 49, Trans- 

 continental Railroad, east of construction camp, just below large 

 LepidocycHna bed, D. R. Semmes, 1920, one specimen; Huasteca 

 Railroad cut, Km 10, Hacienda San Aliguel, 7.5 km south of Dos 

 Bocas Crater, Canton Ozuluama, Veracruz, Dr. T. W. Vaughan, 

 collector, 1920, one specimen. 



Miocene: Quarry, Tiixpan, Mexico, D. R. Semmes, collector, no. 

 77, U.S.N.M., two specimens. 



Family SPATANGIDAE Gray 



Genus EUPATAGUS Agassiz 



EUPATAGUS MEXICANUS, new species 



Plate 14; Plate 15, Figure 1 



Test massive, elongate, ovate, high, rounded, dome-shaped, trun- 

 cate anteriorly, elongate-ovate posteriorly. Steeply rounded from 

 the apical disk to the anterior border of the test. Ventrally nearly 

 flat except the plastron, which is strongly elevated. The anterior 

 furrow is lacking except for a moderate depression ventrally close to 

 the peristome. The paired ambulacra are flush, wide, petaloid, the 

 anterior pair II and IV curving somewhat forward. The anterior 



• Proc. California Acad. Sci., ser. 4, vol. 13, p. 142, 1924. 



• Proc. California Acad. Sci., ser. 4, vol. 13, p. 141, 1924. The species dumblei was figured as Schizaster 

 tcherzeri Gabb by Kew, Proc. California Acad. Sci., ser. 4, vol. 7, no. 6, pi. 18, fig. 2, pi. 19, fig. 2, and pi. 

 20, fig. 2, 1917. 



