EXPLANATION OF PLATE 24. 



All figures natural size. 



Fig. 1. Astrodapsis antiselU Conrad, n. var. arnoldi. Superior view of 

 test. Santa Margarita formation ( ?), upper Miocene; Monterey County. 



Fig. 2. Astrodapsis antiselli Conrad, n. var. arnoldi. Inferior surface 

 showing ambulacra] furrows. Same specimen as that shown in fig. 1. 



Fig. 3. Astrodapsis fernandoensis, n. sp. Upper surface showing the 

 outline of the petals. Fernando formation, lower Pliocene ( ?) ; Elsemere 

 Canon, Los Angeles County. 



Fig. 4. Astrodapsis fernandoensis, n. sp. Inferior surface. Fernando 

 formation, lower Pliocene (!), one mile south of Elsemere Canon, Los An- 

 geles County. 



