stanlon] DONACHXE, TELLINID^E. Ill 



specimen above mentioned is from the " third ridge" of the section at 

 Coalville, Utah, which is a considerably higher horizon and probably 

 in the Montana formation. 



DONAX? OBLONGA 11. Sp. 



PL xxv, Fig. 2. 



Shell rather large, moderately convex, transversely oblong, with the 

 short posterior end obliquely truncate; dorsal and ventral margins 

 nearly parallel; anterior end produced, broadly rounded at the extremity 

 with the greatest convexity of the curve above; posterior umbonal slope 

 prominent and angular, varying considerably in obliquity, but always 

 more oblique than in D. cuneata; beak rather prominent, incurved. 

 Surface and hinge unknown. The casts show a few distant concentric 

 furrows. 



Length of the largest specimen, 45 ,nm ; height, 28 mm ; greatest convex- 

 ity of single valve, 8 mm . 



Besides the large specimen that is figured there are six other much 

 smaller ones that were found associated with it and doubtless belong to 

 the same species. They are all internal casts in sandstone, showing none 

 of the generic features excepting the form, but they are apparently 

 related to the preceding species, and are therefore referred to the same 

 genus. 



I dislike to describe and name such obscure fossils, but in the present 

 case, as the form is very different from any of its associates, it can be 

 easily identified if better preserved examples are ever found, and mean- 

 while the species is just as useful for geological purposes as it would 

 be if all its characteristics were known. 



Locality and position. — In the "second ridge" of the Cretaceous sec- 

 tion at Coalville, Utah, which is approximately the same horizon from 

 which the preceding species were obtained. 



TELLINID^. 



Genus TELLINA Linnaeus. 



Tellina iviodesta Meek. 



PL xxv, Fig. 3. 



Tellina modesta Meek, 1877, U. S. Geol. Expl. 10th Parallel, vol. iv, p. 157, PI. 15, Figs. 

 4 and 5. 



Original description: 



"Shell rather small, transversely elongate-subelliptic, being twice as 

 long as high, rather distinctly compressed; anterior margin narrowly 

 rounded; base forming a long, semielliptic curve; posterior extremity 

 more narrowly and less regularly rounded than the other, apparently 

 slightly bent to the left; dorsal margin declining very slightly, with 



