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PLATE 8. 
1.— Astacus astacus (Linné). o. Leipzig, Germany. M.C. Z., No. 3403. 
1la.— Gonopod of the same. 
1b.— Chela of the same. 
1c.— Antennal scale of the same. 
1d.— Anterior process of the epistoma of the same. 
le.— Profile of anterior end of rostrum of the same. 
1f— Pleura of the second and third abdominal segments of the same. 
2.— Astacus pallipes italicus Faxon. co. Sarno R., Pompeii, Italy, June 10, 1900. 
N. M., No. 28,638. 
2a.— Gonopod of the same. 
2b.— Chela of the same. 
2c.— Antennal scale of the same. 
2d.— Anterior process of the epistoma of the same. 
2e.— Profile of anterior end of rostrum of the same. 
2f.— Pleura of the second and third abdominal segments of the same. a 
3.— Astacus pallipes Lereboullet. @. Saone R., Lyons, France. M. C. Z., No. 3,372. 
3a.— Gonopod of the same. } 
3b.— Chela of the same. 
38c.— Antennal scale of the same. - 
3d.— Anterior process of the epistoma of the same. 
3e.— Profile of anterior end of rostrum of the same. 
3f.— Pleura of the second and third abdominal segments of the same. 
ae 
