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 fine. This flamed pat- 

 tern appears in several of the flat specimens. 



Poecilozonites cupula n. sp. PI. XXXVI, fig. 2. 



Shell sohd, 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; tho 

 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, ^-ith the columellar 

 margin reflexed. 



Alt. 13 Diam. 16 mm. 



The last specimen has 8f whorls. 



The type was selected as the best-preserved specimen, not as the 

 most representative example. The majority of the specimens have 

 a more roimded 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 

 nelsoni. 

 Poecilozonites dalli n. sp. PI. XXXVI, fig. l. 



Shell elevated, with roimded 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 and a Hne above the periphery. The first four whorls are 

 translucent whitish. Whorls 7^ ; 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 colunaellar margin is reflexed, partly covering the perforation. 



Alt. 8.5 Diam. 7.3 mm. 



27 



