103 



Genus CLOSTERISCUS, Meek. 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 denticu- 

 late within, so as to leave internal varices behind as the shell advanced in 

 growth ; inner lip very thin, or wanting ; columella smooth ? 



C. TENUILJNEATUS, Meek. PI. 29, fig. 59, Cretaceous, Cheyenne, Riv., 

 Dakota. 



Genus PAL^EATRACTUS, Gabb. Pyriform, thick; spire low ; colum- 

 ella slightly twisted ; outer lip simple, inner lip incrusted. Surface 

 heavily ribbed or cancellate. 



P. CRASSUS, Gabb. PI. 29, fig. 60. Cretaceous, California. 



Genus PYRIFUSUS, Conrad. Pyriform ; columella broad, thick, 

 flattened ; body volution transversely oval, compressed dorso-ventrally. 



P. SUBDENSATUS, Conr. PI. 29, fig. 61. Cretaceous, Mississippi. 



Subgenus NEPTUNELLA, Meek. Body volution rounded ; columella not 

 flattened ; spire more elevated ; outer lip broadly sinuous above the 

 middle. 



P. NEWBERRYI, Meek and Hay den. PI. 30, fig. 62, Cretaceous, Dakota. 



Subgenus HERCORHYNCUS, Conrad. Shell fusiform ; spire promi- 

 nent, 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. 



H. TIPPANA, Conr. PI. 30, fig. 63. Cretaceous, Mississippi. 



Genus LIROFUSUS, Conr. Genus not characterized. 



L. THORACICUS, Conr. (= DECUSSATOS, Lea). PI. 30, fig. 64. Eocene, 

 Alabama. 



Subgenus SYCOPSIS, Conrad (Subgenus of Busy con = Fulgur). Shell 

 tuberculate, not canaliculate. Eocene and Miocene. Differs from the 

 genus in having tubercles instead of spines on the shoulder. 



Genus STREPSIDURA, Swainson. Widely fusiform ; basal portion of 

 the pillar turned outwardly, with a sharp fold at the base of the aperture; 

 shell costate and sub-carinate, body-whorl ventricose. 



S. COST AT A, Swainson (= Fusus ficulneus, Lam.). PI. 30, fig. 65. 



Genus PAPILLINA, Conrad. Pyriform; shoulder angular and spinous; 

 beak long, with an obtuse fold on the columella ; three volutions from the 

 apex forming a papillated summit. Very probably = Tudicla, Bolt. 



P. PAPILLATUS, Conrad. PI. 30, fig. 66. Eocene, Claiborne, Ala. 



