Vol. VII] DICKERSON & KEIV— FAUNA MEDIAL TERTIARY 133 



with correspondingly greater width of the interporiferous 

 area. 



Geologic Horizon : — Upper Oligocene or Lower Miocene. 



Type:— No. 369, Cal. Acad. Sci. 



Type Locality: — X32 (Rio Bravo Oil Company's number), 

 kilometer 35, C. F. R. R., near Cazones River, Region de 

 Papantla, Mexico. 



Metalia cumminsi, new species. 

 Plate 21, fig. 2; plate 22, fig. 1 ; plate 23, fig. 1. 



Test of large size (antero-posterior diameter, 91 mm., trans- 

 verse diameter, 77 mm., greatest height, 28 mm.) ; marginal 

 outline suboval, elongate anteroposteriorly, truncated behind 

 and with broad, indistinct notch in the odd anterior ambula- 

 crum ; edge of test relatively thin. Apical system excentric to 

 the anterior of the center of the test ; apex immediately in front 

 of the apical system. Odd anterior ambulacrum in a feeble 

 depression, the depressed area extending to the outer edges 

 of the adjoining interambulacral areas ; ambulacral areas 

 narrow, and widening gradually to the ambitus; very small 

 pairs of pores situated in the center of each plate. Anterior 

 lateral interambulacral plates wider on the side next to the 

 odd ambulacrum than on the opposite side. Anterior lateral 

 ambulacra one-half as wide at the margin as the odd anterior 

 one. Posterior lateral interambulacral areas wide. Paired 

 ambulacra petaloid; petals of the same length and narrow; 

 posterior rows of pores in lateral petals extend in straight 

 lines, but the anterior rows diverge from the others until one- 

 half the distance from the apical system to the end of the 

 petal and then converge close to the posterior rows. Porifer- 

 ous areas wide, each being about equal in width to the inter- 

 poriferous area. Pores large, the outer ones more elongate 

 than the inner ones. Petals placed in broad, moderately deep 

 grooves; interambulacral areas somewhat raised on the upper 

 surface and with anterior lateral areas flattened. Actinal sur- 

 face flat with wide prominent amphisternum. A continuation 



