Weller — Kinderhook Faunal Studies. 37 



fied by Herrick * yviihSanguhiolites nobilis De Kon. On 

 comparison with De Koninck's illustration of the Belgian 

 shell, however, there seems to be sufficient difference to ex- 

 clude the North view specimens from that species, and it seems 

 to be a necessity to establish a new species for its reception. 

 The Ohio shell described by Herrick should doubtless be 

 included in this new species. 



EdMONDIA BURLINGTONEN8IS W. & W. 



PL IV. f. 16. 



Shell 30 to 35 mm. in length, the height about two-thirds 

 the length, broadly subelliptical in outline. Anterior and 

 posterior margins broadlj^ and subequally rounded; basal 

 margin nearly straight in the middle, curving into both ex- 

 tremities. Hinge-line straight, subparallel with the basal 

 margin, about one-half as long as the shell. The anterior 

 and posterior portions of the cardinal margin gently curving 

 into the anterior and posterior margins of the shell. Valves 

 moderately convex, slightly flattened in the umbonal region. 

 Beaks prominent and incurved, situated at about the anterior 

 fourth of the total length of the shell. Surface marked by 

 fine concentric striae which are sometimes more or less fas- 

 ciculate and produce undulations which are more conspicuous 

 on the posterior half of the shell. 



Remarks. This is not an uncommon shell in the Northview 

 fauna. It differs slightly from Hall's illustrations of the 

 species, which were drawn from typical examples from the 

 " Yellow Sandstone " at Burlington, Iowa, in its less promi- 

 nent beaks, but this difference is not believed to be of specific 

 importance. 



Edmondia missouriensis n. sp. 



PI. IV. f. 17. 



Shell from 20 to 24 mm. in length, the height about two- 

 thirds of the length; subelliptical in general outline. Basal 

 margin rounded from the most anterior to the most posterior 

 points of the shell ; anterior margin rather broadly rounded 



* Bull. Den. Univ. 3 : 71. pi. X. /. 5.— Also Geol. Surv. Ohio 7. pi. XIII. 

 f.20. 



