278 



University of California Publications. 



[Geology 



dently branch but little, if at all. Main ambulacral grooves 

 continue from the mouth to the margin, entering the marginal 

 notches. Anal pore small, inframarginal. Ambulacral star cen- 

 tral. Petals extend about three-fourths the distance to the mar- 

 gin and not entirely closed at the ends. 



Dimensions: Longitudinal diameter 55 mm. 



Occurrence: This species has been found in the Vaqueros 

 formation, five miles northwest of the Stone Canon coal mine, 

 Monterey County ; and at San Juan Eiver, near La Panza, San 

 Luis Obispo County. 



SCUTASTEE, new genus. 



Test circular, depressed, ambulacral star small. Lunules in 

 the prolongation of the petals of the trivium ; and either lacking 

 in the bivium and posterior interambulacral space, or not placed 

 in the same relative positions as on the anterior portion of the 

 test. 



SCUTASTEE ANDERSON I, n. gen. and sp. 

 PI. 23, fig. 2. 



Test sub-circular in outline, edges markedly thin. Upper 

 surface regularly arched from the margin; apex anterior to the 

 center. Apical system small and apparently central. Ambu- 

 lacral star small; petals extending slightly less than half way to 

 the margin of the test, closed at the ends. Lateral petals broader 

 than the posterior ones, but of almost the same length. Porif- 

 erous zones broad, and continuing full width almost to the ends 

 of the petals. In the posterior petals the interporiferous area 

 forms about one-third the width of the petal. Poriferous zones 

 of the lateral petals equal in width to those of the posterior petals, 

 but enclosed area broader. In the extension of the three anterior 

 petals are broad lunules, over half as long as the petals; shallow 

 grooves extend from the lunules to the margin. Anterior lunule 

 slightly farther from the apical system than are the lateral ones. 

 Prom the ends of the posterior petals the plates enlarge, and the 

 area broadens rapidly. No lunules were seen here, nor in the 

 posterior interambulacral space. They may be represented by 

 marginal notches, as the posterior edge of the specimen is lacking. 



Dimensions: Transverse diameter 44 mm.; height 8 mm. 



