cragin.] DESCRIPTIONS OF SPECIES. 99 
( lERITHIID^]. 
Genus CERITHIUM Adanson. 
Cerithium akcuifbrum sp. ' n. 
PI. XX, tig. 13. 
Shell small, turriculate, many whorled; spindle solid; mouth 
jpbquadrate; surface of the gently convex whorls ornamented with 
numerous fine revolving lines and with coarse transverse folds, or 
ibs, the latter strongly arched backward, the summit and more 
prominent portion of the arch being on the lower and more promi- 
lent portion of the whorls. Of the revolving lines there are about 
L7 on the first spire whorl, and of the arcuate folds there are about 
he same number on the body whorl. 
Measurements. — Breadth, 7 mm.; angular divergence of slopes 
)n the lower part of the shell, 21° or 22°. 
Occurrence. — A mile and a half east of Malone station; with 
Verita nodilirata, Pleurotomaria circumtrunca, etc. Only a single 
pecimen lacking the lower end of the spindle and the upper part of 
he spire has been found. 
Owing to the incompleteness of the lower extremity of the shell in 
he type the basal canal is not shown, but its presence in the complete 
hell and a reference to the genus Cerithium are indicated by the char- 
acter of the spindle and the general habit of the shell, the latter being 
pparently that of the subgenus Cerithinella. 
ACT^OlNriD^. 
Genus ACT^ONINA d'Orbigny. 
AcT.EONINA ? MALONIANA SJ). U. 
PL XX, fig. 14. 
Whorls 4 or 5; body whorl large, about three-fourths as wide a? 
igh in the cast, its sides gently convex; spire small, evidently not 
mch exceeding one-fifth of the body whorl in height; aperture 
igh and narrow, somewhat broadened below, and the inner lip appar- 
ntly without fold; general surface as indicated by a preserved basal 
ragment, marked with delicate revolving grooves or striae, the striae 
?parated by intervals wider than themselves. 
Measurements. — Height (approximately), 14.5 mm.; breadth, 
mm. 
Occurrence. — Known only by a cast bearing two fragments of the 
rell; obtained by Doctor Stanton 1| miles east of Malone station. 
t 
