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PLATE 7. 
1.— Cambarus hagenianus Faxon. Muldon, Miss. Gonopod of o, form I. 1a, outer 
inner side, 1c, front. 
2.— Cambarus pellucidus (Tellkampf). Mammoth Cave, Ky. Gonopod of a, form I. 
side, 2b, inner side, 2c, front. 
3.— Cambarus validus Faxon. Huntsville, Ala. Type. M.C.Z., No.301. Gonopod (o form 
3a, outer side, 3b, inner side, 3c, front. <a 
4.— Cambarus validus Faxon. Type. Antennal scale. } 
5.— Astacus nigrescens fortis Faxon. o. Fall R., Fall City Mills, Cal. Type. U.S. N 
Antennal scale. 
6.— Astacus gambeli connectens Faxon. o’. Snake R., Upper Salmon Falls, Idaho. Type 
N. M., No. 23,096. Antennal scale. 4 
7.— Cambarus hagenianus Faxon. 92. Muldon, Miss. Annulus ventralis. 
8.— Cambarus validus Faxon. o&. Type. Epistoma. 
9.— Astacus nigrescens fortis Faxon. o. Type. Epistoma. 
10.— Astacus gambelii connectens Faxon. &. Type. Epistoma. 
é *. 
