180 University of California Publications in Geology [Vol. ll 



PEESE COEEUGATUM, n. sp. 



Plate 23, figure 2 



Type specimen 11233, Coll. Invert. Palae. Univ. Calif., loe. 2754 



Shell fusiform, medium in size ; spire medium in height, acute ; sutures ap- 

 pressed, with a fairly broad, apjjressed collar, as described in the description of 

 the genus. Body whorl strongly convex, a little below the collar, sloping down 

 very rapidly to the canal; whorls of spire gently convex below the collar. Sur- 

 face sculptured by fairly heavy spiral ribs, with interspaces averaging about the 

 width of the ribs; on each whorl of the spire there are about ten or twelve, and 

 on the body whorl about thirty of the spiral ribs. Surface also covered by ten 

 or eleven fairly heavy, broad, rounded, longitudinal ribs, which, on the whorls 

 of spire, begin just below the depressed collar and extend down to the suture; 

 on the body whorl they extend from just below the appressed collar to a little 

 below the line of highest convexity. Aperture elongate-ovate ; canal straight, 

 medium in length, narrow anteriorly; outer lip thin; inner lip smooth. 



Perse corrugahim is very close to a species in the Oligocene of 

 Washington, found at hoth the Lincoln and Porter localities, and 

 which is listed by Weaver as Hemifusus washingtoniana; this last 

 species, which belongs to the genus Perse, was described by Weaver 

 from the Tejon (Upper Eocene). The form in the Oligocene, listed 

 as this species, is possibly distinct from the Eocene species ; the writer 

 does not have enough material of the latter to be certain of this, but 

 certainly Weaver's type, as figured by him, is different from the com- 

 mon Oligocene form in the Lincoln and Porter beds. This last form, 

 which the writer believes to be very probably a new species, is very 

 similar to Perse corrugatum ; the spire of the former species is some- 

 what lower, the spiral sculpturing is more irregular and the longi- 

 tudinal ribs are more nodose, due to the fact that the spiral ribbing 

 which passes over them is somewhat heavier, and the canal is possibly 

 a little longer. 



PSEUDOPEEISSOLAX, n. genus 



Shell medium to fairly large in size ; body whorl biangulate, with a well-defined 

 shoulder or tabulation above the posterior angle; the sides of the whorl between 

 the two angulations are vertical or nearly so. Surface usually sculptured by 

 fairly fine spiral striations or ribs. Canal long, straight, rather narrow. Colum- 

 ellar axis straight. 



The writer has taken Perissolax blakei Conrad 151 for the type of 

 this genus. Conrad's type was not a perfect specimen; he referred 

 the pieces to Busycon?. Gabb 152 later figured a perfect specimen of 

 this species and referred it to the genus Perissolax. 



For Conrad's original description of Busyeon? blakei, see Pacific Eailroad 

 Rep., vol. 5, p. 322, pi. 2, fig. 13, 1855. 



152 For Gabb's description of Perissolax blakei Conrad, see Geol. Surv. Calif., 

 Palaeontology, vol. 1, p. 92, id. 21, fig. 110, 1864. 



