. Bulletin of the Department of Geology. Geology. 1917] Nomland: The Etchegoin Pliocene of Middle California 239 species: Area trilineata Conrad, Chrysodomus portolaensis (Arnold), Dendraster gibbsii (Remond), Olivella biplicata Sowerby, Paphia staminea (Carpenter), Peeten, ef. healcyi Arnold, Peeten terminus Arnold. PECTEN ETCHEGOINI Anderson Plate 7, figures 1 to 5 Peeten etchegoini Anderson, Proc. Calif. Acad. Sci., vol. 2, p. 198, pi. 18, figs. 92-93, 1905. Peeten wattsi, var. morani Arnold, IT. S. Geol. Surv. Prof. Paper 47, pp. 121-122, pi. 10, figs. 3-6, 1906. Peeten wattsi Arnold, var.
. Bulletin of the Department of Geology. Geology. 1917] Nomland: The Etchegoin Pliocene of Middle California 239 species: Area trilineata Conrad, Chrysodomus portolaensis (Arnold), Dendraster gibbsii (Remond), Olivella biplicata Sowerby, Paphia staminea (Carpenter), Peeten, ef. healcyi Arnold, Peeten terminus Arnold. PECTEN ETCHEGOINI Anderson Plate 7, figures 1 to 5 Peeten etchegoini Anderson, Proc. Calif. Acad. Sci., vol. 2, p. 198, pi. 18, figs. 92-93, 1905. Peeten wattsi, var. morani Arnold, IT. S. Geol. Surv. Prof. Paper 47, pp. 121-122, pi. 10, figs. 3-6, 1906. Peeten wattsi Arnold, var. etchegoini Anderson, U. S. Geol. Surv. Bull. 396, p. 77, 1909. On obtaining a large number of specimens from the type localities of Pecten etchegoini Anderson, P. nutteri Arnold, and P. wattsi Arnold a difficulty was at once experienced in attempting a separation of these forms. By closer study it was found that the prominence of the ribs of P. etchegoini varies greatly. Also the nodose constrictions characteristic of P. wattsi vary much in prominence. It became evi- dent that series could be found for both valves showing a gradation of P. nutteri and P. wattsi into P. etchegoini. Figures are given in the present paper showing gradational series. P. nutteri Arnold and P. wattsi Arnold are therefore here used as variations of P. etchegoini Anderson. SEBPULA (?), sp. Figure 2 , On the south bank of Garza Creek, in the Coalinga district, is exposed a bed composed almost exclusively of tubules believed to represent the genus Serpula. The tubules are about mm. in diameter and are closely packed together, forming an almost solid Pig. 2. Serpida {?), sp. X Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of California, Berkeley. Dept. of Geology. Berkeley : The University Press
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