Geol.— Vol. II.] ANDERSON— CRETACEOUS DEPOSITS. Ill 



agreement. Meek also states a similar relationship for 

 S . luarreni. 



The type is in the collections of the CaHfornia Academy 

 of Sciences. 



Occurrence. — This species, with its associates, is from 

 the Upper Cretaceous beds of Shasta Valley, which in their 

 stratigraphic position correspond very nearly to the fossilif- 

 erous beds of the Forty-nine Mine, near Phoenix, in Roo-ue 

 River Valley, Oregon, and to the Lower Chico beds of 

 Shasta County and the upper Sacramento Valley, Califor- 

 nia. The name is proposed in recognition of the general 

 and intelligent interest taken in geological science by the 

 donor, Mrs. H. B. Gillis of Yreka, who has contributed 

 materially to the present study. 



56. Scaphites condoni, sp. nov, 



Plate II, Figs. 58-63. 



Shell small, type specimen 2.5 cm. in length, r.6 cm. in width, moderately 

 inflated, especially at the recurved portion, where the section of the body- 

 chamber is almost circular; outline of shell subquadrate, inclining to oval; 

 surface ornamented by both ribs and nodes. The body-chamber is crossed 

 just behind the deflected portion by thick transverse ridges with intervening 

 constrictions, which are, however, confined to the sides of the shell and are 

 most prominent upon the middle zone, though extending to the umbilicus 

 and to the row of small tubercules bordering the ventral area. The posterior 

 part of the body-chamber is flattened upon the sides and forms a dorsal 

 expansion which almost covers the otherwise open umbilicus. The coiled 

 portion of the shell is crossed by numerous transverse, slightly curved ribs 

 extending from the umbilical border and branching a little below into two or 

 more divisions. Each of these branches terminates in a node upon the ven- 

 tral margin of the side, from which arise two or more finer ribs crossing the 

 ventral area. Upon the sides of the body-chamber these ribs do not appear, 

 except in the most posterior portion. The nodes upon the ventral shoulder 

 of the whorl first appear at a diameter of near i cm., becoming most promi- 

 nent upon the body-chamber. Along the ventral margin of its sides these 

 nodes show a tendency to become pointed or spinose tubercules which incline 

 outwards, forming a flattened ventral surface. From these tubercules, which 

 are triangular in form, originate small ridges, scarcely noticeable, which cross 

 the ventral portion of the body-chamber. Neither nodes nor ridges, how- 

 ever, are found upon the recurved portion of the shell. Back of the aperture, 

 which is partly closed by a strong constriction, is a conspicuous expansion or 

 thickening of the shell, forming a lip-like ridge surrounding the mouth. The 



