NO. 3 



CASSIDULOID ECHINOIDS — KIER 



i8i 





154 



• 

 • * 



o 

 



• • 



155 



156 



158 



159 



157 



Figs. 154-159. — Growth changes in tlic pliyllodcs and apical system of Rhyncholampas 

 pnciftais (A. Agassiz) : 154, USNM 6988, from Cape St. Lucas, Xantus ; 155, USNM 

 32907, from Pescadero Point, Lower California; 156, USNM 3S6i, from Acapulco, 

 Mexico; all of phyllode_ II, Xio; 157, USNM 32907; 158, USNM 6988; 159, USNM 

 929, from Albatross station 2995, X 20. 



