1904.] NATURAL SCIENCES OF PHILADELPHIA. 417 
on a background of a yellowish cuticular color. The depressed speci- 
men which is figured has traces of a subperipheral band, a supra- 
peripheral line, and radial flaming above this line. This flamed pat- 
tern appears in several of the flat specimens. 
Pecilozonites cupula n. sp. Pl. XXXVI, fig. 2. 
Shell solid, dome-shaped, with somewhat flattened base, perforate, 
strongly striate; pale, shiny-corneous, with subsutural and subper- 
ipheral bands of darker color, and faint traces of two narrow bands 
on the periphery. Whorls 7%, a little convex, increasing slowly; the 
last vaguely angulate at the periphery. The aperture is somewhat 
quadrangular on account of the straight, vertical columella and the 
peripheral angle. The peristome is simple, thin, with the columellar 
margin reflexed. 
Altec: Diam. 16 mm. 
Locality No. 806. 
Other specimens measure: 
Alt. 13.5 Diam. 16.5 mm. 
12.5 17 
13 19 
13 20 
15 15.5 
The last specimen has 83 whorls. 
The type was selected as the best-preserved specimen, not as the 
most representative example. The majority of the specimens have 
a more rounded base and periphery, giving the peristome a more oval 
contour. The height of the shell and the absence of a keel distinguish 
it readily from P. bermudensis zonatus, and the very round dome 
and less angulate periphery separate it from immature specimens of 
nelsonv. 
Pecilozonites dalli n. sp. Pl. XXXVI, fig. 1. 
Shell elevated, with rounded apex and convex base, perforate. Its 
surface is polished, with incremental lines less pronounced than those 
of P. cupula; milky-white, with a yellowish-brown band below the 
periphery a.d a line above the periphery. The first four whorls are 
translucent whitish. Whorls 74; all but the final whorl are flat as if 
keeled, that one has a blunt peripheral ridge, below which it is deeply 
rounded. The aperture is quite oblique, round-lunate. The peris- 
tome is simple, except at the columella, which it joins without an angle, 
but the columellar margin is reflexed, partly covering the perforation. 
Alt. 8.5 Diam. 7.3 mm. 
27 
