PLATE I. 
Legend. 
g. Urabonal scare. 
1. Lateral scars. 
' k. Middle laterals, 
j. Anterior laterals. 
1. Outside laterals, 
x. Concrete laterals. 
h. Central scars. 
c. Concrete centrals, 
i. Transmedian scars. 
d. Cardinal area. 
s. Median septum. _ 
s'. Lateral septa, 
vs. Vascular trunks, 
v. Vascular brandies. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Tig- 
Fig. 
Figs. 
Fig. 
Fig. 
LINGULA, Bruguusre. 
Page 2.1 
Glossina, Phillips. 
Page 15. 
Lingula (Glossina) acuminata, Conrad. 
1. A pedicle-valve from which most of the substance of the shell has been exfoliated, presenting a 
cast of the internal surface, which retains the impressions of the fine radiating, and coarser, 
more distinct, concentric lines. The thickness of the shell-substance and the undulating char¬ 
acter of its laminae, is shown on the marginal portion of the figure, but no traces of muscular 
impressions are discernible. X 2. 
2. A brachial valve of the same species, from which the shell is partially exfoliated. X 2. 
Calciferous sandstone. Saratoga, N. Y. 
Lingula (Glossina) riciniformis, Hall. 
3. A pedicle-valve (?) from which the outer layers of the shell are somewhat exfoliated ; showing the 
strong median radii, which are evidently more distinctly developed on the interior than on 
the exterior of the shell. X 3. 
Trenton limestone. Middleville, _ZV. Y. 
Lingula Yanhornii, Miller. 
4. The interior of a pedicle-valve ; showing the undifferentiated lateral muscular scars, and the low, 
median septum. X 3. 
Hudson River group. Cincinnati, Ohio. , 
Lingula Procteri. Ulrich. 
5. The brachial valve of an internal cast; showing the concrete laterals (x), the anterior laterals (j), 
and the septum (s). X 1.5. 
6. The opposite valve of the same specimen ; showing the progressive lateral and median impres¬ 
sions (septum) and the'vascular markings. X 1.5. 
Hudson River group. South Covington, Kentucky. 
7. An internal cast of a brachial valve ; showing the lateral scars and long median septum. X 2. 
Hudson River [group. Cincinnati, Ohio. 
Lingula Philomela, Billings. 
8. A pedicle-valve (?), imperfect in the umbonal region ; illustrating one extreme of outline attained 
by shells of this genus. Natural size. 
Trenton limestone. Florenceville, Howard county, Iowa. 
Lingula lamellata, Hall. 
9. 10. External and internal views of the same specimen. Natural size. 
Niagara group. Lockport, N. Y. 
Lingula cuneata, Conrad. 
11. An internal cast of the pedicle-valve; showing the broad, low, median septum and the faint lateral 
scars. X 2. 
12. The brachial valve, with an ill-defined muscular scar and traces of the vascular sinuses. 
Medina sandstone. Albion, N. Y. 
