104 BucciNnxa:. 



Genus PERISSOLAX, Gabb. Spire depressed ; body-whorl patulous ; 

 canal long ; columella without folds or plaits. 



Distinguished from Papillina by the want of a columellar fold, and 

 evidently intended to be ranged in the Fusinae, but I think its general 

 appearance decidedly that of Busy con or Tudicla. Cretaceous Eocene. 



P. BREVIBOSTRIS, Gabb. PI. 30, fig. 67. Cretaceous, California. 



Levifusus, Conrad, is generally considered synonymous with Perissolax. 

 It is an uncharacterized Eocene form, of which I figure an example : 



L. (PERISSOLAX) TRABEATUS, Conr. PI. 30, fig. 69. Eocene, Alabama. 



Genus TORTIFUSUS, Conrad. Differs from Busycon in being without 

 a trace of tubercles or spines, and in having prominent regular ribs ; the 

 whorls are flattened on top, and slightly canaliculated. 



T.CURYJROSTRA, Conr. PI. 30, fig. 69. Miocene, N. Carolina. 



Genus PYROPSIS, Conrad. Spire very short, apex not papillated ; 

 labrum without striae within, thick ; columella without a fold. 

 P. PERLATA, Conrad. PI. 30, fig. 70. Cretaceous, Tippah Co. Miss. 

 Genus CLAVIFUSUS, Conrad. The genus has not been characterized. 

 C. COOPERI, Conrad. PI. 30, fig. 71. Eocene, Alabama. 

 C. ALTILIS, Conrad. PI. 30, fig. 72. Eocene, Alabama. 



Sub-Family PISANIIN^. 



Subgenus CANTHARULUS, Meek. (S. G. of CantJiarus). Shell with 

 canal moderately produced, rather narrow and twisted ; inner lip smooth 

 throughout, and rather well developed ; columella arcuate and twisted, so 

 as to form an obtuse, undefined prominence below ; outer lip slightly 

 sinuous above. 



C. VAUGHANI, Meek and Hayden. PI. 31, fig. 73. Cretaceous, Upper 

 Missouri River. 



Genus METULELLA, Gabb. Shell fusiform, canal more or less pro- 

 duced; inner lip covered with a thickened plate, continuous posteriorly 

 with the outer lip. Interior of both inner and outer lips strongly denticu- 

 lated or transversely striated. Surface cancellate or costate. More dis- 

 tinctly fusiform than Metula, the columella with a row of denticles. 



M. FUSIPORMIS, Gabb. PI. 31, fig. 74. Miocene, San Domingo, W. L 



Genus LEVIBUCCINUM, Conrad. Not characterized. 



L. PRORSUM, Conr. PI. 58, fig. 412. Eocene, Alabama. 



Genus AGASOMA, Gabb. Subfusiform, spire low, body-whorl long ; 

 canal moderately produced and slightly deflected ; aperture elongate, 

 labrum simple; labium incrusted with a thin, smooth plate; suture bordered 

 by an elevated portion of the succeeding whorl as in Olavella. It differs 



