INVERTEBRATES. 129 



Position and locality: Coal Measures, Peoria county, 111. 



Collector, Mr. Gifford. 



No. 2529 of the Illinois State Museum. 



GENUS SANGUINOLITES, McCoy. 



SANGUINOLITES ? MULTISTKIATUS. Worthen. 



PL XIX, Fig. 2. 



Sanguinolites? multistriatus, Worthen, March, 1884. Bulletin No. 2, of the Illinois State 

 Museum of Natural History, page 14. 



The specimen from which the following- description is drawn, 

 is a cast from the shaly sandstone of the Keokuk group, and 

 may be characterized as follows : 



Shell below the medium size, oblong, valves moderately convex; 

 beaks depressed, and situated about one-third the entire length 

 of the shell behind the anterior extremity. 



Dorsal line straight, basal border slightly rounded, extremities 

 obtusely pointed and apparently gaping, surface marked by 

 numerous fine concentric striae that are most conspicuous on the 

 posterior portion of the valves. The specimen is somewhat dis- 

 torted by pressure, so that its exact proportions cannot be de- 

 termined. 



Length 1 inch; height % inch. 



Position and locality- Keokuk shales near Crawfordsville, In- 

 diana. 



Collector, Frank H. Bradley. 



No. 2528 of the Illinois State Museum. 



SANGUIXOLITES? BURLINGTOXEXSIS. Worthen. 



PI. XX, Figs. 8-Sa. 



Sangninolites? burling tonens is, Worthen, March, 1884. Bulletin No. 2 of the Illinois State 

 Museum of Natural History, page 14. 



Shell of medium size, longitudinally elongate-ovate, more than 

 twice as long as high, moderately and evenly convex anteriorly, 

 and regularly depressed towards the posterior extremity. Car- 

 dinal margin slightly depressed in the middle and elevated 

 behind, giving a greater breadth to the posterior than the 

 anterior region. 



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