BUCCINIDE. 141 
intended to be ranged in the Fusine, but I think its general 
appearance decidedly that of Busycon or Tudicla. Cretaceous 
to Kocene. P. brevirostris, Gabb (1i,59). Cretaceous; California. 
LEVIFusus, Conrad, is generally considered synonymous with 
Perissolax. It is an uncharacterized Eocene form. P. trabeatus, 
Conr. Eocene; Alabama. 
Fusisprra, Hall. 
Distr.—F. ventricosa, Hall (li, 50). Trenton Limestone, near 
Green Bay. So far as known, this paleozoic genus is confined to 
the Quebec, Trenton and Hudson River groups. 
Shell fusiform, imperforate, spire more or less elevated, with 
rounded volutions ; aperture elongate, oval or elliptical, produced 
below, forming a subrimate canal; columella slightly twisted, 
without folds, peristome sharp. Surface smooth. 
Crostreriscus, Meek. 
Distr.— C. tenuilineatus, Meek (li, 51). Cretaceous ; Cheyenne 
Riv., Dakotah. 
Shell thin, fusiform; spire slender, longer than aperture and 
canal; surface smooth or minutely striate; aperture rhombic, 
outer lip broadly retreating above the middle, thin, excepting at 
irregular intervals, where it became thickened and denticulate 
within, so as to leave internal varices behind as the shell advanced 
in growth ; inner lip very thin, or wanting ; columella smooth (?). 
PALHATRACTUS, Gabb. 
Distr.— P. erassus, Gabb (li, 52). Cretaceous; California. 
Pyriform, thick ; spire low; columella slightly twisted ; outer 
lip simple, inner lip incrusted. Surface heavily ribbed or can- 
cellate. 
Pyrirusus, Conrad. 
Distr.—P. subdensatus, Cony. (1i,53). Cretaceous ; Mississippi. 
Pyriform ; columella broad, thick, flattened ; body-volution 
transversely oval, compressed dorso-ventrally. 
NEPTUNELLA, Meek. Body-volution rounded; columella not 
flattened ; spire more elevated ; outer lip broadly sinuous above 
the middle. P. Newberryi, Meek and Hayden (li, 54). Creta- 
ceous ; Dakotah. 
Hercoruyncus, Conrad. 
Distr.—H. Tippana, Conr. (li, 55). Cretaceous; Mississippi. 
Shell fusiform; spire prominent, scalariform, longitudinally 
ribbed and tuberculated, or with tubercles only ; top depressed 
above the angle or shoulder of the last whorl, which depression 
becomes angular at the aperture, emarginating the upper part of 
the labrum ; last whorl broad and rather abruptly rounded at 
base; beak abruptly recurved and produced. 
