cragin.] DESCRIPTIONS OF SPECIES. 95 
Occurrence.— The type and only known example was obtained by 
Doctor Stanton in foothills at the northwest end of Malone Moun- 
tain, a little over 2 miles east -southeast from Finlay station. 
Natica bilabiata sp. n. 
PI. XX, figs, !>. H). 
Shell rather small, consisting (apparently) of about 3J strongly 
convex whorls; without umbilicus; provided with a narrow, elon- 
gate, and shallow cleft formed by the e version of the inner lip; 
spire short, its height much less than that of the aperture; suture 
w T ell impressed; aperture obliquely ovate, about two-thirds as high 
as the entire shell; outer lip simple; inner lip everted, thickened 
below, its border quite free in the middle region, where it pursues a 
nearly straight course and constitutes the outer bound of the small 
umbilical cleft; exterior smooth except for the numerous ordinary 
growth lines. 
Measurements. — Height, about 21 mm.; breadth IS mm. 
Occurrence. — One specimen, from the same fragment of limestone 
that bore one of the types of Unicardium semirotundum ; H miles 
east of Malone station. Collected by Doctor Stanton. 
PYRAMIDELLID^. 
Genus PSETJDOMELANIA Pictet. 
PSEUDOMELANJA GOODELLII Sp. 11. 
PI. XXI, fig. 10. 
Shell large, turreted, consisting of numerous smooth, flattened, 
upwardly-imbricated whorls, of which the lower spire whorls are 
nearly twice as wide as high; shell substance thick, sometimes show^- 
ing, parallel with the height (length) of the shell, numerous rather 
narrow, unequal, or subequal, alternating dark and light bands, of 
which there are perhaps as many as 50 of either shade on each whorl. 
Measurements. — Breadth of body whorl in largest specimen, 50 
mm.; breadth of first spire whorl, 43 mm.; height of same, 21 mm. 
The shell in this specimen apparently had a height of 170 to 180 
mm. In a second example, with body whorl 44 mm. in breadth, the 
ishell height is about 165 mm. 
Occurrence. — This, the largest of the Gastropoda known from the 
Malone formation, is only moderately common; and all of the mate- 
rial of it obtained is more or less fragmentary, though collectively 
affording a fair knowledge of the species. The above description of 
it, based on all of the material now known, supersedes an earlier one 
in manuscript made by me at a time when my knowledge of the 
