934 CATALOGUE OF PHANEROPNEUMONA. 
Stoastoma Vilkinsonie, Adams, in Ann. Lyc. New York, v. n. 2, 
p. 64; Contrib. to Conch. n. 8, p. 148; Pfr. Pnewm. Mon. p. 326. 
Hab. Jamaica. 
17. Stoastoma HoLLANDIANUM. 
Shell subdiscoidal, pale horn-colour, subtransparent, with five 
spiral carinz, one of which is visible on the spire; with very 
delicate spiral raised lines, usually three to six in each inter- 
space ; spire moderately elevated, convex ; whorls 34, moderately 
convex, subangular, with a well-impressed suture; last whorl 
scarcely detached from the penultimate whorl at the aperture ; 
aperture rather large, slightly constricted behind the lip, which 
is moderately produced, above not very abruptly produced, 
scarcely modified by the carne; labium well detached from 
the penultimate whorl, scarcely reflected ; umbilicus rather wide, 
with the spiral lamella moderately developed. Operc. deeply 
concave, subauriculate, smooth. Height 0.035, greatest breadth 
0.065, least br. 0.055 inch. 
Stoastoma Hollandianum, Adams, in Ann. Lyc. New York, v. n. 2, 
p- 65; Contr. to Conch. nu. 8, p. 149; Pfr. Pneum. Mon. p. 326. 
Hab. Jamaica. 
18. StoastoMA BLANDIANUM. B. M. 
Shell perforate, rather discoidal, yellowish-whitish, sculptured 
under the lens with crowded spiral striz, some of which are more 
raised; spire scarcely elevated; whorls 34, scarcely convex, the 
last one broad, rounded, descending anteriorly, rather flattened 
beneath; aperture oblique, semioval; peristome simple, con- 
tinuous, with the right margin arcuately dilated, columellar 
margin detached, basal margin continued into a little promi- 
nent lamina. Height 4}, greatest breadth 2}, least br. 2 mill. 
(A variety is much smaller.) 
Stoastoma Blandianum, Adams, Mon. p.6; Pfr. in Z. f. M. 1850, 
p- 63; Pneum. Mon. p. 327. 
Hab. Jamaica. 
19. Sroastoma AGASSIZIANUM. 
Shell subdiscoidal, horn-coloured, subtransparent; with, on the last 
whorl, four very prominent sharp carina, viz. one along the peri- 
phery, and two below and one above, the latter appearing only 
for a short distance on the penultimate whorl; with a few fine 
raised spiral lines on the upper part of the whorls and between 
the carine; spire slightly elevated; whorls 34, planulate, with a 
moderately-impressed suture; last whorl planulate beneath, 
