PLATE LIV. WOT 
OBOLELLA CRASSA (Hall)—Continued. 
Fieure 2j. Interior of ventral valve from Locality 29a, Lower Cambrian limestone at Schodack, Rensselaer County, 
New York. U.S. Nat. Mus. Cat. No. 51952a. 
2k. Interior of a dorsal valve associated with the specimen represented by figure 2a. U.S. Nat. Mus. Cat. 
No. 51951i. 
21. Cast in limestone of the interior of a dorsal valve from Locality 27, Lower Cambrian limestone in the 
eastern suburb of Troy, New York. The exact position of the anterior lateral muscle scars in figure 
21is more or less uncertain and the line from (i) indicating the transmedian scar should unite with 
that from (1) as in figure 21. U.S. Nat. Mus. Cat. No. 15347a. Specimen figured by Walcott [1886b, 
Pl. X, fig. 1c]. The other specimens illustrated [Walcott, 1886b] are not redrawn in this monograph. 
2m. Interior of a dorsal valve associated with the specimen represented by figure 2a. The other specimens 
were used to draw in the details of the area. U.S. Nat. Mus. Cat. No. 51951j. 
2n. Cast of the interior of a ventral valve associated with the shell represented by figure 2a. U.S. Nat. Mus. 
Cat. No. 51951k. : 
OBOLELLA MINOR (Walcott) (p. 596). 
Figure 3. Exterior of a ventral valve. U.S. Nat. Mus. Cat. No. 24628c. 
3a. Cast of the interior of a ventral valve, the type specimen, showing area and cast of pedicle groove. U.S. 
Nat. Mus. Cat. No. 24628a. 
3b. Cast of interior of ventral valve. U.S. Nat. Mus. Cat. No. 24628d. 
3c. Exterior of dorsal valve. U.S. Nat. Mus. Cat. No. 24628b. 
3d. Cast of interior of a dorsal valve. U.S. Nat. Mus. Cat. No. 24628e. 
The specimens represented are all from Locality 32, Lower Cambrian sandstone, Stissing Mountain, Dutchess 
County, New York. The figures (3, 3a-d) are copied from Walcott [189la, Pl. LX XII, figs. 4a, 4d, 4, 4b, and 4c, 
respectively]. They were then labeled ‘‘ Camarella ? minor.”’ 
62667°—vou 51, pr 2—12 12 
