204. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Types.—Holotype: 45069a and counterpart 45069b; figured paratype: 45069c. 
Horizon and locality—Aylmer formation (Rockcliffe member, black shale) 
in Canada: Hogs Back, south of Ottawa, Gloucester Township, Carleton County, 
Ontario. 
Discussion—The ornamentation of this species is like that of Pseudolingula 
sculptata from the Camp Nelson formation at High Bridge, Ky., but the latter is 
a much larger species with relatively finer ornamentation. 
LINGULELLA SPICATA Cooper, new species 
Plate 7, D, figures 23, 24 
Shell of small to medium size for the genus, brownish gray to dark brown in 
color ; length 14 times the width, narrowly oval in outline with a strongly pointed 
beak and broadly expanded anterior. Apical angle about 60°. Lateral margins 
gently curved from the beak to the anterolateral margins which are narrowly 
rounded ; anterior margin strongly curved. Surface marked by strong concentric, 
elevated lines, crowded along the margins but not strongly elevated, faint on the 
median areas. 
Pedicle valve: Lateral profile gently convex with the greatest depth at about 
the middle and with long, gentle anterior and posterior slopes. Posterior profile 
narrowly rounded; anterior profile only gently rounded. Umbonal region nar- 
rowly convex and with steep lateral slopes, the swelling continuing anteriorly to 
a point slightly anterior to the middle; anterior third flattened. 
Brachial valve: Brachial convexity about equal to that of the pedicle valve 
but with the maximum depth slightly posterior to the middle; anterior profile 
moderately convex, distinctly more so than that of the pedicle valve; posterior 
profile less convex than that of the opposite valve; anterior slope gently convex, 
long and moderately steep. Posterior margin narrowly rounded and with the 
beak anterior to the posterior margin. Lateral margins very gently curved; an- 
terolateral extremities narrowly rounded; anterior margin strongly curved. 
Umbonal and median areas moderately strongly swollen. 
Measurements in mm.— 
Length Width 
Helotype (pedicle valve). ois‘ sseiomeclathshtores ae hte es does 15.0 98 
Paratype (brachial valve 100300 D)jsssie essere -yseies toe gay ws 10.5 7.4 
Types.—Holotype : 109301a; figured paratype: 109301b; unfigured paratypes: 
10930Ic,d. 
Horizon and locality —Whitesburg formation in Tennessee: Railroad cut at 
Summit Hill School, 1 mile southwest of Otes, Bulls Gap (T.V.A. 171-SE) 
Quadrangle. 
Discussion.—This species is characterized by the strongly acuminate pedicle 
beak, in which respect it is reminiscent of the Cambrian Lingulepis. This species 
is different from all others herein described in the acuminate character of the 
beak. 
