692 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Idiospira panderi Billings is a globular species generally slightly longer than 
wide with a strongly uniplicate anterior commissure and a fairly well-marked 
fold on the brachial valve. The pedicle tongue is usually marked by a costa, and 
the fold has a short depression to accommodate it, thus giving the fold an anterior 
bicostate form. 
Types.—Syntypes: G.S.C. 1148,a,b; figured hypotypes: 85329a, 853302, 
92374a,c, 117251a. 
Horizon and locality—Rockland formation in Quebec: On Allumette Island ; 
same formation in Ontario: At Paquette Rapids; Stewarts Quarry, 25 miles 
south of Rockland. 
Lower Trenton formation in New York: North of Amsterdam. 
Tyrone formation in Kentucky: 2 miles south of High Bridge; Curdsville, 
Mercer County. 
Auburn chert in Missouri: 4 mile east of Auburn, Elsberry (15’) Quadrangle. 
Decorah formation (Guttenburg member) in Iowa: On M.St.P. and P. RR., 
1 mile north of Eagle Point Bridge, Dubuque. 
Hull formation in Ontario, Canada: At Kirkfield. 
IDIOSPIRA ? WARTHINI Cooper, new species 
Plate 140, K, figures 63-72; plate 195, G, figures 38-41 
Shell large for the genus, length and width about equal in the adult; outline 
oval ; apical angle about 100° ; sides rounded; greatest width located just anterior 
to the middle. Anterior commissure moderately strongly uniplicate; surface 
smooth except for I or 2 costae at the anterior margin. 
Pedicle valve moderately convex in lateral profile and with the maximum con- 
vexity slightly posterior to the middle; anterior profile stronger than the lateral 
one and with short, moderately steep lateral slopes. Beak moderately long. Umbo 
and postmedian region swollen; sulcus originating at about midvalve, wide and 
shallow, forming a short, wide tongue. Tongue marked by 2 costae that extend 
almost to the middle of the valve. Sulcus bounded by 2 short, narrow costae. 
Flanks swollen and with steep sides. 
Brachial valve moderately convex in lateral profile and with the maximum 
depth at the middle; anterior profile broadly domed. Umbonal and median re- 
gions swollen ; fold inconspicuous, broad and low, confined to the anterior third 
to fifth ; fold marked by 3 narrowly rounded costae. Flanks swollen, slopes steep. 
Measurements in mm.— 
Brachial 
Length length Width Thickness 
Holotype’ (GU, 2508OD) 5 sa siis anne wk 10.9 0.7 9.2 6.9 
Paratype (UI. 250LGa ) cies tenes cst AD 10.9 12.0 ape 
COIST Me Payee aay eee erie orns 9.6 8.9 8.9 4.9 
Types.—Holotype: Columbia Univ. 25919b; figured paratypes: Columbia 
Univ. 259192; U.S.N.M. 1172522. 
Horizon and locality —Wappinger formation in New York: In the railroad 
