PALEOZOIC TIME — DEVONIAN. 



613 



of species. The genera having the most of the species are Loxonema, Cyclo- 

 nema, and Bellerophon. ConularicB are not uncommon. 



939-fl47. 



943. 



944. 



939 a. 





942 «. 



942 6. 



Beachiopods, Chemung. — Fig-s. 939, 939 a, EhynchoneUa contracta ; 940, 940 a, Productella lacn-mosa ; 941, 

 Atrypa hystrix ; .942 a, 6, Spiriferdisjunctus. Lamellibranchs. — Fig. 943, Aviculopecten duplicatus ; 944, 

 Pterinea Chemungensis ; 945, Leptodestna lichas. Gastropod. — Fig. 946, Bellerophon maera ; 947, Bactrites 

 acicula. From Hall. 



OIC! 



Lamellibeanch, Catskill. — Amnigenia Catskillensis. Vanuxem. 



Cephalopods are few, except under the genera Ooniatites and Orthoceras. 

 The thin Styliolina limestone bed in the Genesee shale contains several 



