— 43 — 



being circular in section). Surface smooth, often retaining high polish, 

 even in the fossils. Outer lip thickening moderately, leaving the 

 mouth lateral, much as in Erato, differing in non-crenulated lips, and 

 in the form of anterior notch, peculiar dorsal canal, etc. Its relations 

 to other genera are evident, and show very interesting stages of develop- 

 ment between them. No distinct folds or denticles on columella or lip 

 at any age. 



The animal evidently widened the mouth by absorption while thick- 

 ening the shell on outside, and finally attained nearly the form of 

 Erato. Posterior angle of mouth deeply notched, and anterior end 

 forming a deeply notched canal, slightly turned upward. Found only 

 near Marysville Buttes, Sutter County, by Mr. Watts and Mr. Ullrey. 

 Eight specimens obtained. '^ Ancillaria glandiformis '' Lamarck, fossil, 

 may be congeneric. 



A. (Oliverato) californica n. sp. (PL I, Figs. 6 to 10.) 



About half of spire (the nuclear whorls) invisible in adult; mouth 

 with lips nearly parallel at middle; narrower at ends in the young, 

 with about ten faint ridges along columella, not passing inside; no 

 umbilicus. Dorsal surface marked by ridges from irregular thickness 

 of the callus, and a deep oblique furrow running from the anterior 

 notch toward the left, as in PseudoUva, etc. Parallel to this, about six 

 light ridges remain permanent behind it, thickened but not obscured 

 by callus. General form becoming more ovate with age, but always 

 narrower in front. Length, about 1.50 inch; breadth, about 0.85; 

 mouth, 1.12 inch long, 0.50 wide. Eight specimens examined. 



Four of the specimens are polished and colored a fine brown, just as 

 in the living Erato vitellina. This color is confined to a thin outer 

 layer of the callus, as shown in the dorsal figures. 



Bittium longissimum n. sp. (PL II, Fig. 30.) 



Exceedingly long compared to its diameter; first three or four whorls 

 regularly convex, smooth; the remaining thirteen with ten to fourteen 

 vertical riblets crossed by three revolving ones, which cancellate the 

 surface uniformly; the anterior riblet largest, thus giving the whorl a 

 turreted form; mouth quadrilateral, simple (the basal surface cannot be 

 seen). Length, 0.45 inch; breadth, 0.06; mouth, 0.03. The shell had 

 at least sixteen whorls, and the smoothness of the upper ones may be 

 due to erosion. It much resembles the living B. asperum Gabb (stouter 

 with thirteen whorls), a variety of which is also turreted. (See Pal. 

 of CaL, II, p. 12, pi. 2, f. 20.) Marysville Buttes, only found by Mr. 

 Watts. Figure twice the natural size. 



