AUT. u FOSSIL MOLLUSKS FROM THE MIOCENE MANSFIELD 6 



ribs, extending from the anal fascicle forward to the suture on the 

 spire whorls and to the base on the body whorl. Spiral sculpture of 

 narrow bands on the whorls in front of the anal fasciole; on the 

 early whorls these are narrow, closely set, and occasionally inter- 

 calated with a spiral thread; on the later whorls, especially over the 

 base, the bands are wider and usually intercalated with a finer spiral. 

 Spiral sculpture Avithin the anal fasciole of fine closely set threads. 

 One or two slightly heavier threads lie in front of the suture. The 

 spiral sculpture over the whole surface of the shell is minutely rough- 

 ened by axial growth-lines. Aperture wide, subovate in form. Anal 

 notch wide and deep. Outer lip thin, slightly inflected at the lower 

 part. Columella and parietal wall with a heavy wash of callus. 

 Siphonal canal short, anteriorly bent backward. 



Diviensiovs.— Type (Cat. No. 352436, U.S.N.M.), altitude, 11 mm.; 

 greatest diameter, 4 mm. ; length of aperture, 4 mm. ; width of aper- 

 ture, 1.8 mm. 



Type locality.— U. S. G. S. Station 1/236, Kushmere Wharf, on 

 James River, Va., highest bed exposed. (W. C. Mansfield, collector.) 



The new subspecies differs from Clathrodnllia? helloides (Olsson), 

 described from the Yorktown formation, James River above Smith- 

 field, Va., in having fewer, stronger, and more protracted axials. 



Occwi'ence. — Yorktown formation, middle part of the Turritella 

 alticof<taia zone ; known only from type locality. 



FUSINUS (BUCCINOFUSUS) PROPEPARILIS, new species 

 Plate 1, figures 5, 9 



Shell of moderate size, fusiform, solid, axiallj'^ and spirally sculp- 

 tured. Whorls rapidly enlarging, rounded, moderately constricted 

 at the suture. Suture appressed and undulating. Subsutural area 

 wide and shallowly excavated. Axial sculpture of (on the penulti- 

 mate whorl, twelve) strong, rounded, vertical ribs, strongest over 

 the periphery of the whorl. These ribs do not descend to the base 

 on the first half of the body whorl and become obsolete over the 

 last half. Whole surface axially marked by fine growth lines, all 

 the spirals being rugose. Spiral sculpture of five to six primary 

 threads, beginning on the posterior slope and extending forward to 

 the suture. There are about 26 of these spirals on the last whorl 

 and the canal. Besides the primary spirals, secondary threads vary- 

 ing in strength intercalate the primary spirals and ortiament the 

 rest of the surface. On approaching the end of the canal these 

 secondaries become stronger and are reduced to two or three in 

 number. Aperture ovate. Canal long and reflexed anteriorly. 

 Columella coated with callus along the border and side of the 

 siphonal canal. 



