CANCELLARIIDA. 181 
Commencing with the Upper Cretaceous. @. cancellata, Linn. 
(Ivii, 96). 
Shell oval, cancellated, reticulated or ribbed ; last whorl ven- 
tricose; aperture oblong, canaliculated in front, canal short, 
sometimes recurved, columella with several large oblique plica- 
tions. 
The Cancellariz are vegetable feeders, ranging from low-water 
to 40 fathoms. 
TRIGONOSTOMA, Blainy. Shell conic-oval, widely umbilicated ; 
whorls angular or babylonic, longitudinally ribbed; aperture 
triangular, angulated in front. C. tuberculosa, Sowb. (lvii, 97). 
APHERA, H. and A. Adams. Shell oval, not umbilicated ; 
columella and inner margin of aperture widely covered with 
eallus. C. tessellata, Sowb. (lvii, 98). 
EucLIA, H. and A. Adams. Shell pyriform, not umbilicated ; 
spire very short; whorls smooth; columella with large anterior 
plications. _C. solida, Sowb. (lvii, 99). 
MERICA, H. and A. Adams. Shell oval, spire sharp; whorls 
reticulated ; aperture oblong, not channeled in front; columella 
with oblique plications ; internal lip callous, exterior lip sharp. 
C. elegans, Sowb. (vii, 100). 
NARONA, H.and A. Adams. Shell oval, fusiform; spire elevated, 
sharp; whorls sharply ribbed; aperture oblong, canaliculated 
in front; the columella plicate, posterior rib the largest ; outer 
lip crenulated. C. clavatula, Sowb. (lvii, 1). 
MASSYLA, H. and A. Adams. Shell oval, turbinated, spire 
obtuse; whorls transversely striated; aperture reflected and 
channeled in front; columella truncated. @. corrugata, Hinds 
(lvii, 2). 
TURBINOpsIS, Conr. Columella with a single very oblique fold 
near the basal margin. C. Hilgardi, Conr. (lvii, 3). 
MOREA, Conrad. Short, elliptical; aperture much longer than 
the spire; columella reflexed, concave, with a prominent acute 
fold at the base. M. cancellaria, Conr. (Ivii, 4). Cretaceous ; 
Miss. 
BABYLONELLA, Conr., 1865. Uncharacterized. 11 sp. Eocene. 
C. elevata, Lea. Claiborne, Ala. 
ADMETE, Moller. 
Distr.—A. viridula, Fabr. (vii, 5). 
Shell oval, thin, diaphanous, covered by a thin epidermis ; 
spire sharp ; last whorl ventricose; aperture oval, feebly chan- 
neled in front; columella arcuated, obliquely truncated, with 
rudimentary plications ; outer lip sharp. 
This small group represents Cancellaria in boreal seas in the 
same manner that Trophon replaces Murex and Bela does 
Mangelia. 
