PLATE 7. 



Fig. 1. — Caniharvs hagenianus Faxon. JVIuklon, Mi.ss. Gonopod of a', form I. In, outer side, lb, 



inner side, Ic, front. 

 Fig. 2. — Ctmibarus pcllucidus {TeWkami)!). IManimoth Cave, Ky. Gonopod of o^, form I. 2(i, outer 



side, 26, inner side, 2c, front. 

 Fig. 3. — Cnmbariis validtis Faxon. Huntsville, Ala. Type. M. C. Z., Xo.301. Gonopod (o" form I.). 



3a, outer side, 36, inner side, 3c, front. 

 Fig. 4. — Cdiiibanis I'aiidus Faxon. Type. Antennal scale. 

 Fig. 5. — Astacus nigrescens fortis Faxon. &  Fall R., Fall City Mills, Cal. Type. U. S. N. M. 



Antennal scale. 

 Fig. (i. — Astacus gamb(:iico)mede7is Faxon, cf. Snake R., Upper Salmon Falls, Idaho. Type. U.S. 



N. M., No. 23,096. Antennal scale. 

 Fig. 7. — Cambarus hagenianus Faxon. 9- Muldon, Miss. Annulus ventralis. 

 Fig. 8. — Cambarus rnlidus Faxon, cf • Type. Epistoma. 

 Fig. 9. — A.ttacus nigrescens forlis Faxon, a^. Type. Epistoma. 

 Fig. 10. — Astacus gandielii conncclens Faxon, o"'. Type. Epistoma. 



