LAMELLIBRANCHIATA. 627 
Saffordia modesta.] 
inflected so as to form a well marked escutcheon. In front of and beneath the beaks 
a deep lunule. Surface marked with regular, concentric folds, obsolete on the car- 
dinal slopes, and by two or three times more numerous fine stria, which seem to, 
have extended over all parts of the surface. 
This neat shell was at first described as a Cuneamya, but with the discovery of 
the closely allied S. ventralis it became evident at once that the species had been 
misplaced. Compared with the type species it is found to differ in its form, the 
dorsai and ventral margins being much less curved and the outline decidedly oblong 
instead of rather broadly oval. The umbonal ridge also is somewhat better defined 
and the anterior end of the shell projects beyond the beaks which is not the case in 
S. ventralis. 
Formation and locality.—At the top of the Hudson Riyer group, Spring Valley, Minnesota. 
SAFFORDIA MopESTA Ulvich. 
PLATE XLI, FIGS. 29—31. 
Cypricardites? modestus ULRICH, 1892. Amer. Geol., vol. x, p. 100. 
- Shell small, moderately ventricose, obliquely ovate in outline, known from casts 
of the interior only. In these the anterior end is very small, sharply rounded, 
abruptly depressed beneath the beaks, projecting very little beyond them, and almost 
entirely occupied by a subcircular muscular scar. Beaks small, only slightly incurved, 
appearing prominent. Umbonal ridge scarcely distinguishable, the cardinal slope 
faintly concave between it and another low ridge-like swelling that forms the back 
of the cast. Along the hinge line there is a narrow impressed area. The lunule, 
like the escutcheon, is proportionally narrower than in the other species. Shell 
thin; hinge plate narrow, apparently with the characters (as shown by recently 
obtained material) required by the genus. 
As near as can be determined from casts of the interior only, this species would 
appear to occupy an intermediate position between S. ventralis and S. sulcodorsata, 
being longer than the first and shorter than the second. 
Formation and locality.—Lower half of the Galena at Oshkosh, Wisconsin, and several localities in 
Goodhue and Fillmore counties, Minnesota. 
