66 University of California PuMicatioiis in Geology [Vol. 12 



bulacra about three times the width of the adjoining areas. Petals 

 of moderate size, symmetrical, and reaching slightly over one-half the 

 distance from the apical system to the margin ; odd anterior a nd 

 posterior lateral petals of equal length and somewhat shorter than 

 the anterior lateral pair ; all of same width, with very wide poriferous 

 areas and narrow interporiferous areas, except that of the odd pos- 

 terior petal, which is slightly wider than the others. Inner rows of 

 oval pores extend in nearly parallel lines to the end of the petal, 

 converging but little at their ends ; outer rows of slit-like pores diverge 

 at first to a much greater degree and then continue approximately 

 parallel to the inner rows until near the extremity of the petal, when 

 they sharply converge close to the inner rows ; outer rows of pores in 

 the odd anterior petal curve more regularly from the base to the end. 

 Lower surface nearly flat. Periproct very small and marginal. 



Related forms. — This form most closely resembles the Vaqueros, 

 Lower Miocene species, Scutella vaqiterosensis Kew, but may easily 

 be distinguished by the shape of the petals, which in S. coosensis are 

 narrower, with wider poriferous areas in proportion to the interporif- 

 erous areas; also the odd anterior petal of S. vaquerosensis is broader 

 and wide open at its extremity. S. fairhanksi Arnold differs in having 

 a supramarginal periproct, a subcircular outline, and in that the petals 

 possess broader interambulacral areas. 



Geologic horizo-n. — Eocene series (Meganos?). 



Locality.— Holotype from north side of Sec. 4, T. 26 S., R. 14 W., 

 west of Yokam Point, Coos County, Oregon (Calif. Acad. Sci. Coll.). 



SCUTELLA FAIRBANKSI Arnold 

 Plate 11, figures 2a, 26, 2c 



Scutella fairbanl-.ii (Merriam MS.) Arnold. Proe. IT. S. Nat. Mus., vol. 32, 



1907, p. 542, pi. 46, fig. 3; pi. 43, figs. 5, 5a. 

 ScuteUa fairbanlcsi. Eldridge and Arnold, TJ. S. Geol. Surv. Bull., no. 309, 



1907, pi. 29, fig. 9. 



ScuteUa fairbanJcsi. Pack, Univ. Calif. Publ. Bull. Dept. Geol., vol. 5, 1909, 



pp. 276-277, pi. 23, fig. 1. 

 Echinarachnius fairbanlsi. Stefanini, Boll. Soc. geol. ital., vol. 30, 1911, 



p. 703. 



ScuteUa fairbanksi. Clark and Twitchell, U. S. Geol. Surv. Mon., vol. 54, 

 1915, pp. 184-185, pi. 85, figs. 4-6. 



Holotype. — No. 11017 ; figured specimen, no. 11360. Univ. Calif. 

 Coll. Invert. Pal. 



