PLATE 6. 
Fig. 1.— Cambarus immunis spinirostris Faxon. Pontoosue Lake, Lanesboro, Mass., Aug. 12, 1911. 
M.C. Z., No. 7,363. Gonopod of the &,formI. 1a, outside, 1b, front, 1c, inside. 
Fig. 2.— Gonopod of the &, form II. of the same, 2a, outside, 2b, front, 2c, inside. 
Fig. 3.— Epistoma of the same. . 
Fig. 4.— Antennal scale of the same. 
Fig. 5.— Annulus ventralis of the 9 of the same. 
Fig. 6.— Chela of the o’, form I. of the same. 
