154 NASSID/I. 
the Malaysian Archipelago, etc. They live with the Nassas 
along shore-lines and do not appear to inhabit great depths. 
The animal, which is unknown, is supposed, from the sutural slit 
which characterizes the shell,to possess a mantle provided with 
a prolongation or fold occupying the slit, somewhat analogous, 
perhaps, with that of Oliva. The operculum of C. lyrata is 
elongated, rhomboidal, with terminal nucleus, externally con- 
cave, internally convex. 
CYLLENINA, Bellardi, 1882. Spire more produced, the last 
whorl about half the length of the shell; parietal wall of the 
aperture concave, without lip; columella terminating anteriorly 
in an oblique truncation, which is usually ridged. 12 sp. Ter- 
tiary; Northern Italy. C. Ancillarizformis, Grat. Appears 
to connect Cyllene with Nassa. 
Buccirriron, Conrad. 
Syn.—Sagenella, Conrad. 
Distr.—B.cancellatum, Lea = sagenum, Conr. (li, 73). Eocene ; 
Alabama. 
Genus not characterized, One of the typical specimens of B. 
sagenum has a single varix on the back of the body-whorl, but 
the other specimens are without it, so that its non-absorption 
may be regarded as accidental. 8B. altum is a different type of 
shell entirely, and looks something like a Truncaria. 
Famity NASSIDA. 
Shell ovate, spire usually elongated, base of aperture a notch 
or short recurved canal, inner lip usually callous. Operculum 
corneous, ovate, nucleus apical, margins plain or serrated. 
Animal having two small processes or tails at its posterior 
extremity. Lingual teeth arched, pectinated; the uncini with 
a basal horn, and occasionally intermediate serrations. Dentition 
(x, 1): 
Many fossil species are known, commencing with the Eocene. 
Norruta, Gray. 
Distr.—3 sp. Panama, Philippines. N. serrata, Dufresne 
(lii, 74). 
Shell elongated, turreted, polished; spire elevated, acuminated, 
whorls depressed and sloping at their upper part; aperture 
shorter than the spire; outer lip with the margin serrated. 
Dentition unknown. 
This genus is in its general aspect much closer to Pusionella 
in the family Terebridz than to the genera with which it is here 
(and has been heretofore) associated; the variceal thickening 
at or near the outer lip is, however, a feature which does not 
