PLATH XXVII. 97 
LINGULELLA IRENE (Billings) (p. 508). 
Ficure 6. Interior of a flattened ventral valve, preserving the area and portions of the shell. The concentric striation 
of the exterior of the shell is shown at the place where the shell is broken away. 
6a. Partly exfoliated outer surface of a dorsal valve that is compressed in the shale. 
The specimens represented are both from Locality 813a, Lower Ordovician Levis shale at Point Levis, Quebec, 
Canada, and are in the collection of the Geological Survey of Canada. They were described and figured by Billings 
[1862d, pp. 71-72, figs. 64a—b] as Lingula irene. Figure 6 may be taken as the type. 
LINGULELLA CUNEOLA (Whitfield) (p. 488). 
Fieure 7. Cast of a ventral valve from Locality 355, Middle Cambrian sandstone, Red Canyon Creek, Black Hills, 
South Dakota. U.S.Nat. Mus. Cat. No 24587a. Type specimen, figured by Whitfield [1880, Pl. I, 
fig. 6] as Lingulepis cuneolus. The specimen figured by Whitfield [1880, Pl. I, fig. 5] is not figured in 
this monograph. _ 
7a. Cast of the interior of a ventral (?) valve, associated with the valve represented by figure 7, preserving a 
portion of the shell on the outer margins. U.S. Nat. Mus. Cat. No. 33873a. 
7b. Cast of the interior of a dorsal valve, associated with specimens represented by figures 7 and 7a. U.S. 
Nat. Mus. Cat. No. 33873b. 
62667°—vo1 51, pr 2—12——7 
