300 University of California Publications in Geology t VoL - 



if at all. Main ambulacral grooves continue from the mouth to the margin, 

 entering the marginal notches. Anal pore small, inframarginal. Ambu- 

 lacral star central. Petals extend about three-fourths the distance to the 

 margin and not entirely closed at the ends. 



Examination of the new material has brought out the fol- 

 lowing points : The test is sub-circular to sub-pentagonal in 

 outline, resembling somewhat a maple leaf. The outline is ren- 

 dered undulatory both by the deep notches in the extremities of 

 the ambulacrae and by shallow indentations of the margin near 

 the junction of the ambulacral and interambulacral areas. The 

 abactinal surface is very slightly arched, and the slope from the 

 margin to the apex is regular. The petals extend about two- 

 thirds the distance from the center to the margin, and show 

 only a slight tendency to close. The apical system is central. The 

 size and peculiar outline of this species are sufficient to differen- 

 tiate it from other west coast forms. Scutella merriami Anderson 

 shows shallow marginal notches in the extremities of the posterior 

 ambulacrae, and in rare cases the notches become deep enough 

 to shape the test into an outline similar to that of 8. norrisi. 

 The greater size of the latter species is, however, sufficient to 

 differentiate it. 



Occurrence : Eastern Monterey County near the Stone Can- 

 yon mine : San Luis Obispo County, at Panza, on the San Juan 

 River, and in the mountains between the San Juan River and 

 the Carrizo Plains ; Orange County, in the San Joaquin Hills 

 south of Santa Ana. 



This species is characteristic of the Lower Miocene. 



Dimensions: Diameter through the anterior petal about 75 

 mm. Height 6 to 7 mm. 



Genus SCUTASTER Pack 

 Univ. Calif. Publ. Bull. Dept. Geo]., vol. 5, p. 270, 1909. 



The original generic description is as follows : 



Test circular, depressed, ambulacral star small. Lunules in the pro- 

 longation 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. 



