FLORA or TIIK SHASTA FORMATION. 2()i) 



The one represented in PI. LXIX, Figs. 15 and Id (counterparts), 

 shows the basal portion and petiole, while the specimen Fig. 17 gives 

 the upper part of the same kind of leaf. The leaf shown in Figs, lo and 

 16 was collected by Will Q. Brown at the locality that yielded the 

 Dioouitcs Buchiatius ahiduniH and in the same sandstone. The speci- 

 men shown in Fig. 17 was collected by Mr. Claude Rice from a locality 

 given as "near Riddles, Oreg., Horsetown beds." The rock material 

 containing both imprints is exactly alike, and it is i)robably the same 

 stratum, although this is not stated on the labels. The specimens are 

 evidently parts of the leaA'es of Sapindopsis, and it may be one of the 

 forms of that genus found in the Lower Potomac of Virginia and Mary- 

 land. I am, however, induced to regard it as a new species on account 

 of the length of the petioles, which nnich surpasses that of any of the 

 previously described species. The species of the Lower Potomac have 

 the uppermost leaflets of the compound leaf consolidated. Lower 

 down they are sessile, and in the lowest ones a very short petiole is shown. 

 It may be that in leafliMs lower than any found in the Potomac species 

 the petiole becomes as long as that of the Oregon plant. It is note- 

 worthy that the Potomac compound leaves preserved in the fossil state 

 show only the leaflets toward the end of the compound leaf. The leaf 

 texture of Sapindopsis oregoncnsis is so thick and coriaceous that the 

 surface is smooth and shining, while the secondary nervation is hidden. 

 The midrib, however, is strong. The leaflet was narrowly elliptical in 

 form and probably 6 cm. long, with a width in the widest part of 12 mm. 



Order ROSALES. 

 Family G^SALPINIACE.E. 



Genus ACACLEPHYLLUM Fontaine. 



Acacia PHYLLUM ellipticcm Fontaine n. sp. 



PI. LXIX, Fig. IS. 



Two leaves were fountl in the Shasta formation that strongly 

 resemble those from the Lower Potomac strata of Viriginia which have 

 been described by me" imder the generic name Acaeia^phyllum. One 



« Monogr. U. S. Geol. Surv., Vol. XV, p. 279. 



