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Cambarus Alabamensis Fax. Male, form I. Lauderdale Co., Ala..

Astacus (Cambaroides Schrenckii Fax. Female.

Cray-Fish (Cambarus affinis).

Astacus Klamathensis Stimps. Male. Fort Walla Walla, Washington Territory. Astacus Klamathensis Stikmps. Male. Sikan Creek, Oregon

Cambarus argillicola Fax. Male, form I. Detroit, Mich..

Astacus klamathensis Stimpson. Male. Portland, Or. Shjowing the abnormal, atavistic form of the regenerated claw of the left side.

Cambarus bartonii robustus (Girard). Bog River, St. Lawrence Co., N. Y., July, 1912.

Astacus klamathensis Stimpson. Male. Portland, Or. Both of the chelipeds are secont growths, the left the older.

Cambarus cornutus Fax. Male form I. Green River, Ky.. Side view of head

Astacus klamathensis Stimpson. Male. Portland, Or. Showing both claws regenerated, of full size, and nearly symmetrical..

Cambarus Cubensis Erichs. Male, form I. Havana, Cuba.

Astacus klamothensis Stimpson. Male. Portland, Or. Showing the chelipeds of normal shape.

Cambarus forceeps Fax. Male, form I. Lauderdale Co., Ala..

Astacus astacus (Linne). Male. Leipzig, Germany. 1a. Gonopod of the same; 1b. Chela of the same

Cambarus Giradianus Fax. Male, form II. lauderdale Co., Ala..

Astacus fluviatilis--Side View of a Male Specimen.

Cambarus hagenianus Faxon, female. Muldon, Miss..

Astacus fluviatilis--Ventral or sternal views.

Cambarus hagenianus Faxon, male. Muldon, Miss..

Newly-Hatched Young of a Crayfish (Astacus fluviatilis).

Cambarus hagenianus Faxon. Muldon, Miss. Gonopod of male, form I. 1a outerside, 1b innerside, 1c front. 2. Cambarus pellucidus (Tellkampf). Mammoth Cave Ky. Gonopod of male, form I. 2a outerside, 2b innerside, 2c front; 3. Cambarus validus Faxon. Huntsville, Ala. Type. Gonopod (male form I). 3a outer side, 3b innerside, 3c front

Cambarus hamulatus Fax. Male, form II. Nickajack Cave, Tenn..

Cambarus Harrisonii Fax. Male, form I. Irondale, Mo..

Cambarus Hayi Fax. Male form I. Eastern Mississippi.