132 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sei 



DESCRIPTION OF SPECIES 



Clypeaster cubensis Cotteau 



Plate 20, fig. 1 ; plate 21, fig. 1 



Clypeaster cubensis Cotteau, 1876. Description Echinides 

 Tertiare des Isles Saint Barthelemy et Anguilla, Kong- 

 liga Svenska Vetenskaps-Akademiens Handlingar, Bd. 

 13, no. 6, p. 6. 



Geologic Horizon : — Upper Oligocene or Lower Miocene. 

 Localities: — xl4, x30, x34 (Rio Bravo Oil Company's 

 numbers ) . 



Scutella cazonesensis, new species 

 Plate 19, fig. 1 



Test of large size (approximate anteroposterior diameter, 

 105 mm., approximate transverse diameter 111 mm.); mar- 

 ginal outline subcircular with prominent, deep, angular notch 

 in the odd posterior interambulacrum, and with ambulacral 

 areas truncated or faintly and broadly notched. Test strongly 

 depressed and markedly thin. Apical system central. Am- 

 bulacra petaloid; petals symmetrical, of moderate size, and 

 extending about two-thirds the distance from the apical 

 system to the margin. In petals of the trivium, the inter- 

 poriferous area is about two-thirds the entire width of the 

 petal; interporiferous area of the bivium narrower, equal in 

 width to one-half the petal. Inner rows of elongate pores 

 diverge gradually for about two-thirds the length of the petal, 

 and then converge slightly to the end; outer rows of very 

 small round pores converge to a greater degree at the ex- 

 tremity of the petal, and close with the inner rows ; pores con- 

 jugate. Petals half open at their ends. Genital pores small; 

 pores in radial plates relatively large. Tuberculation on the 

 superior surface of the test consists of minute crowded scrobi- 

 cular tubercles. Periproct very small (1.5 mm. in diameter), 

 and situated about 4 mm. from the margin on the under sur- 

 face. 



This species is similar to Scutella ahcrti Conrad, but is dis- 

 tinguished by having narrower poriferous areas in the petals 



