UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 7, No. 13, pp. 299-304, pi. 15 Issued June 12, 1913 



NOTES ON SCUT ELLA NORRISI AND 

 SCUTASTER ANDERSON! 



BY 



KOBEET W. PACKi 



In 1909 the writer published a few notes on the Tertiary 

 Bchinoids of California, describing several new species and the 

 new genus Scutaster. 2 Since this paper was written more nearly 

 perfect specimens of Scutella norrisi and Scutaster andersoni 

 have been obtained. The writer therefore takes pleasure in fur- 

 nishing more complete figures of these species than it was possible 

 to give at the time the type descriptions were written, together 

 with a few notes to supplement the original descriptions. 



SCUTELLA NORRISI Pack 

 Plate 15, figure 1 



Univ. Calif. Publ. Bull. Dept. Geo!., vol. 5, p. 277, pi. 23, fig. 3, 1909. 

 The original description is as follows : 



Test sub-circular in general outline, with deep, broad, marginal notches 

 in the edges of the ambulacral areas. The two posterior notches are much 

 deeper than are the anterior ones, and truncate the posterior interambu- 

 lacral space on either side of the median line, shaping the posterior end 

 of the test into a prominent process. The test when viewed from above 

 has a leaf-like appearance. Test much depressed, edges markedly thin, 

 abactinal surface very slightly arched, apex central; actinal surface flat 

 or gently concave. Mouth central, slightly sunken; ambulacral furrows 

 poorly shown in the specimens examined, but evidently branch but little, 



1 Published by permission of the Director of the United States Geolog- 

 ical Survey. 



2 Univ. Calif. Publ. Bull. Dept. Geol., vol. 5, pp. 275-283, 1909. 



