1920] 



Kew: Cretaceous and Cenozoic Echinoidea 



73 



converging but little toward the extremities of the petals ; odd anterior 

 one wide open, the rows of pores not converging. Petals of the trivium 

 reach nearly to the margin of the test, but those of the bivium only 

 about two-thirds the distance to the margin. Odd anterior petal 

 somewhat elevated, forming the highest portion of the test. The angle 

 between the anterior lateral petals very wide, being almost 180°, 

 whereas the angle between the petals of the bivium is about 60°. Pores 

 conjugate and extend in parallel rows beyond the ends of the petals 

 almost to the margin ; each poriferous area approximately equal to the 

 interporiferous area in the lateral petals ; the interporiferous area 

 of the odd petal is wider. Actinal surface flat. Peristome slightly 

 sunken. Ambulacral furrows usually obliterated, but when visible 

 are broad, straight, and undivided. In some specimens ambulacral 

 lines are present, which tend to bifurcate. Periproct marginal. In- 

 ternal structure consists of radial partitions with connecting supports 

 near the periphery of the test. 



Related forms. — This species differs from Scutdia gabbi (Remond) 

 mainly in the more depressed test ; more swollen margin ; in the eleva- 

 tion of the odd anterior petal ; and in the constant marginal position 

 of the periproct. It also resembles >S'. andcrsoni Twitchell, but may 

 be distinguished from this form by the lack of the posterior marginal 

 lobe in the odd interambulacral area ; in its thicker and more swollen 

 margin; in the marginal position of the periproct, which in S. andcrsoni 

 is supramarginal. S. tejonensis Kew may be easily separated by its 

 wide open, flaring petals. 



• Geologic horizon. — Lower part of Monterey group. Lower Miocene 

 (?). Occurs in beds associated with the Turritella ocoyana zone 

 fauna. 



Localities. — Cotypes in Calif. Acad. Sci. Coll. from along the east 

 side of the Temblor Range in Kern County, California ; also occurs 

 in Tejon Hills, Kern County, California, and about one mile north 

 of El Tore, Orange County, California. 



SCUTELLA NEWCOMBEI Kew, n. sp. 

 Plate 8, figures 2a, 2b 



Holot>jpe.—No. 11356 Univ. Calif. Coll. Invert. Pal. 



Test of medium size. Approximate measurements of holotype : 

 anteroposterior diameter 40 mm., transverse diameter 44 mm., greatest 

 elevation 7.8 mm. Outline subcircular, with margin truncated in the 



