„ „ ,, , , LAMELLIBEANCHIATA. 627 



Saffordla 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 striaj, which seem to, 

 have extended over all parts of the surface. 



This neat shell was at first described as a Guneamya, 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 

 dorsal 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 River group, Spring Valley, Minnesota. 



'Saffordia modesta Ulrich. 



PLATE XLI, FIGS. 29-31. 



Cypricarditesf modestus Ulrich, 1892. Amer. G-eol., 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 occupjr an intermediate position between S. ventralis and S. mlcodorsata, 

 being longer than the first and shorter than the second. 



Formation and locality.— Lovfer half of the Galena at Oshkosh, Wisconsin, and several localities in 

 Goodhue and Fillmore counties, Minnesota. 



