PLATE I—Continued. 
LINGULA, Bruguiere. 
Page 2. 
Lingula punctata, Hull. 
Fig. 26. An enlargement of the external surface; showing the character of the ornamentation. X 12. 
Fig. 27. A cast of the interior of the brachial valve; showing the indistinct lateral scars, the vascular 
sinuses and their ramifications. X 2. 
Fig. 28. An internal cast of a uedicle-valve; showing the compound lateral scars and the broad centrals. 
X 2. 
Hamilton shales. Canandaigua Lake, N. Y. 
Lingula Delia, Hull. 
Fig. 29. The type-specimen, a brachial valve (?), retaining most of the surface ornamentation, and showing 
a very strong median septum. X 2. 
Hamilton shales. Canandaigua Lake, N. Y. 
Lingula scutella, sp. nov. 
Fig. 30. An internal cast, indicating that the muscular region of the valve was depressed, instead of thick¬ 
ened and elevated as usual. X 2. 
Chemung group. Alleghany county, N. Y. 
Lingula Whitii, Walcott. 
Fig. 31. A copy of Mr. Walcott’s figure of the brachial valve of this species (Palseont. Eureka District, pi. 
xiii, fig. 3). X 2. 
Lower Devonian. Atrypa Peak, Eureka District, Nevada. 
Lingula Melie, Hall. 
Fig. 32. A valve, showing the broad, low median septum, with its elevated margins. X 2. 
Waverly group. Berea, Ohio. 
Lingula .(Glossina) flabellula, sp. nov. 
Fig. 33. A very large example, from which a portion of the shell has been exfoliated, without showing 
any traces of muscular markings. The' anterior margin is represented with too great a 
curvature. Natural size. 
Waverly group. Sciotoville, Ohio. 
Fig. 34. A smaller valve, exposing the inner laminae of the shell, with faint radiating lines. Natural size. 
Berea grit. Berea, Ohio. 
LINGULEPIS, Hall. 
Page 59. 
Lingulepis pinniformis, Owen. 
Fig. 35. An internal cast of a pedicle-valve ; showing the faint median septum, and the elongate muscular 
scar, with its lateral and central divisions. X 2. 
Fig. 36. An internal cast of the brachial valve, in which the muscular impression is flabellate, the central 
and lateral scars being quite distinct, the latter somewhat bilobed. X 2. 
Potsdam sandstone. Falls of the 8t. Croix, Minnesota. 
