1920] 



Kew: Cretaceotis and Cenozoic Echinoidm 



77 



and slightlj^ eccentric anteriorly. Periproct marginal, of small size, 

 and placed in the posterior interambulaeral notch. 



Related forms. — This species very closely resembles Scutella ander- 

 soni Twitchell, with which it is associated, in size, outline, and in the 

 wide and slightly elevated odd anterior i^etal. It ditfers in its thicker 

 and more rounded margin ; more eccentric apical system ; in the flaring 

 appearance of the petals, in contrast to the usually lanceolate type 

 of the former ; in that the petals extend nearer the margin ; and in 

 the position of the periproct, which is in a distinct marginal notch. 



Only one specimen of this species is known. Although quite dis- 

 similar from Scutella cundersoni, there seems to be a gradation between 

 the two species in the shape of petals, the most distinctive feature. 

 The petals of the bivium in the latter form are often flaring to a 

 slight degree like those of S. tcjonensis. These forms, including 8. 

 merriami (Anderson), are probably closely related species. 



Geologic horizon. — Vaqueros formation. Lower Miocene. Associ- 

 ated with 8. andersoni Twitchell. 



Localitii. — Tejon Hills, Kern County, California, Univ. Calif, loe. 

 3358. 



SCUTELLA VAQUEROSENSIS Kew, n. sp. 

 Plate 8, figure 3; plate 9, figures la, Ih, Ic 



Cotypes.—lSSos. 11403 and 11404 Univ. Calif. Coll. Invert. Pal. 

 and no. 447 Calif. Acad. Sci. Coll. Pal. 



Test large, markedlj^ thin. Measurements of specimen 447 : antero- 

 posterior diameter 67 mm., transverse diameter 81.2 mm., greatest 

 height approximately 8 mm. Outline undulating, truncated behind, 

 and rounded anteriorly; transverse diameter greater than the antero- 

 posterior diameter, with greatest breadth immediately posterior to the 

 center of the test ; broadly notched in the paired ambulacral areas, 

 slightly so in that of the odd anterior one. Upper surface greatly 

 depressed and rising gently from a very thin margin and nearly flat 

 submarginal area to the apex, the latter being either coincident with 

 the apical system or slightly anterior to it on the odd anterior petal ; 

 the greatest elevation is within the area limited by the length of the 

 petals. Apical system slightly eccentric to the anterior. The four 

 genital pores remarkably small. Ambulacra nuich wider than the 

 interambulacra at the ambitus, that of the odd anterior being twice 

 as wide as the adjoining interambulacra. Dorsal portions of the 



