ANNALS CARNEGIE MUSEUM. Vol. III. 



Plate V. 



I — Orthothetes chemungensis var pectenacea Hall. X^ 2. — Orthothetes chemungensis 

 var. arctistriatus Hall. X 2. 3. — Orthothetes bellulus Clarke. X 2. 4, 5. — Chonetes 

 mucronatus Ha'l. X 2- 6. — Cyrtina hamiltonensis Hall. X 2. 



