EXPLANATION OF PLATE 13 



Figures approximately natural size. 



Fig. 1. ScuteUa gahhi (Eemoud). Neotype, specimen 11001, Univ. Calif. Coll. 

 Invert. Pal. Upper surface of test. Couti'a Costa County, Calif., Univ. Calif, 

 loc. 2983. Basal beds of the San Pablo group, Upper Miocene. 



Fig. 2a. ScuteUa gabhi (Eemond) {large form). Specimen 11002, Univ. 

 Calif. Coll. Invert. Pal. Upper surface of test. Contra Costa County, Calif., Univ. 

 Calif. loc. 1282. Basal beds of the San Pablo group, Ujjper Miocene. 



Fig. 2b. ScuteUa gabbi (Eemond) {large form). Specimen 11369. Lower 

 surface of test. 



Fig. 3. ScuteUa gabbi (Eemond) {notched form). Specimen 11007, Univ. 

 Calif. Coll. Invert Pal. Upper surface of test. Contra Costa County, Calif., 

 Univ. Calif, loc. 1478. Upper San Pablo grouj), LTpjjer Miocene, occurring ^\•ith 

 Astrodapsis tuiuidiis Eemond. 



Fig. 4o. ScuteUa gabbi var. tenuis Kew. Holotype, specimen 1100-5, Univ. 

 Calif. Coll. Invert. Pal. Upper surface of test. Contra Costa County, Calif. 

 Lower San Pablo group, Upper Miocene. 



Fig. ib. ScuteUa gabbi var. tenuis Kew. Specimen 11370, Univ. Calif. Coll. 

 Invert. Pal. Lower surface of test. Same locality. 



Fig. 5a. Astrodapsis brewerianus (Eemond). Neotj'pe, specimen 11016, Univ. 

 Calif. Coll. Invert. Pal. Upper surface of test. Walnut Creek, Contra Costa 

 County, Calif. Brioues formation ("ScuteUa breweriana zone"). Middle Miocene. 



Fig. 56. Astrodapsis brewerianus (Eemond). Specimen 11016. Lateral sur- 

 face of test. 



Fig. Of. Astrodapsis brewerianus (Eemond). Specimen 11371, Univ. Calif. 

 Coll. Invert. Pal. Lower surface of test. Contra Costa County, Calif. Briones 

 formation, Midille Miocene. 



Fig. 6. Astrodapsis brewerianus diaMoensis Kew, n. var. Holotype, specimen 

 11335, Univ. Calif. Coll. Invert. Pal. Upper sui'face of test. Las Trampas Eidge, 

 Contra Costa County, Calif., LTniv. Calif, loc. 1191. Briones formation, Middle 

 Miocene. 



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