CANCELLARIID^. 181 



Commencing with the Upper Cretaceous. G. 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 Cancellarite are vegetable feeders, ranging from low-water 

 to 40 fathoms. 



TRiGONOSTOMA, Blainv. Shell conic-oval, widely umbilicated ; 

 whorls angular or babylonic, longitudinally ribbed ; aperture 

 triangular, angulated in front. G. tuberculosa, Sowb. (Ivii, 9*7). 



APHERA, H. and A. Adams. Shell oval, not umbilicated ; 

 columella and inner margin of aperture widely covered with 

 callus. G. tessellata, Sowb. (Ivii, 98). 



EUCLiA, H. and A. Adams. Shell pyriform, not umbilicated ; 

 spire ver}^ short ; whorls smooth ; columella with large anterior 

 plications. G. solida, Sowb. (Ivii, 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. 

 G. elegans, Sowb. (Ivii, 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. G. clavatula, Sowb. (Ivii, 1). 



MASSYLA, H. and A. Adams. Shell oval, turbinated, spire 

 obtuse ; whorls transversely striated ; aperture reflected and 

 channeled in front ; columella truncated. G. corriigata, Hinds 

 (Ivii, 2). 



TURBiNOPSis, Conr. Columella with a single very oblique fold 

 near the basal margin. G. Hilgardi, Conr. (Ivii, 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). Cretaceovis ; 

 Miss. 



BABYLONELLA, Conr., 1865. Uncharacterized. lisp. Eocene. 

 G. elevata, Lea. Claiborne, Ala, 



Admete, Moller. 



Distr. — A.viridula,'F2i\)i'. (Ivii, 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. 



