376 A. \V. GBABAU — SILURO— DEVONIC CONTACT IN NEW VOKK 



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Figure 5. Loxonema f sp .'!70 



An internal mold in the rock matrix. 



Figure 6a-d. Leperditia scalaris Jones 371 



6a. Left valve, showing; ocular tubercle and dorsal nodule. 

 6I>. A smaller left valve, showing an additional subcentral tuber- 

 cle (muscle-spot? ). 



6r-d. Two right valves, showing eve tubercle and marginal flattening. 



