April, 1905.] Odonata, Astacidae and Unionidae. 311 



The specimens thus agree apparently with those mentioned 

 by Faxon (1S9S) from Big Cahawba River, central Alabama, 

 (Alabama River drainage), which are said to be intermediate 

 bewteen extranens and girardiamis. The typical extraneus is 

 reported from Etowah River, Rome, Floyd Co., Ga. (Alabama 

 River drainage) ; the var. girardianus Fax. is known from 

 Cypress Creek, Lauderdale Co., Ala., and from Eastanaula Creek, 

 near Athens, McMinn Co., Tenn. (both belonging to the Tennes- 

 see River drainage). The new locality belongs to the Cumber- 

 land River, and it is remarkable that instead of finding here 

 girardianus, we have a transitional form, which rather resembles 

 extraneus. 



Rock Castle River, Livingston, Rock Castle Co., Ky. E. B. 

 Williamson. 



3. Cambarus piitnaini Fax. 2 males (second form), 1 

 female. Agree well with description. This species is positively 

 known from the following localities only: Kentucky, Grayson 

 Springs, Grayson Co.; Green River, near Mammoth Cave; 

 Cumberland Gap. 



Rock Castle River, Livingston, Rock Castle Co., Ky. E. B. 

 Williamson. 



FRESH-WATER MUSSELS. 



My specimens were kindly determined by Dr. Dall and a 

 complete set has been placed in the National Museum. The 

 following arrangement and nomenclature are those of Simpson's 

 Synopsis from which work I have copied the distribution of each 

 species. 



1. Lampsilis ventricosus Barnes. Entire Mississippi drain- 

 age; St. Lawrence system; Nelson River and tributaries. 



2. Lampsilis multiradiatus Lea. Entire Ohio River drain- 

 age; southern Michigan. 



3. Lampsilis taeniatus Conrad. Tennessee and Cumberland 

 River systems. 



4. Lampsilis rectus Lamarck. Entire Mississippi drainage; 

 Alabama River drainage ; Red River of the North ; St. Lawrence 

 system. 



5. Lampsilis trabalis Conrad. Kentucky and streams of 

 Tennessee; Clinch River, Virginia. 



(3. Lampsilis glaus Lea. Ohio River drainage; Warsaw, 

 Indiana; (probably St. Lawrence drainage) southern Michigan; 

 W^hite River, Carroll County, Arkansas. 



7. Medionidus acutissimus Lea. Alabama River system. 



8. Medionidus subtentus Say. Tennessee and Cumberland 

 River systems. 



9. Tritogonia tuberculata Barnes. Mississippi drainage gen- 

 erally ; streams falling into the Gulf of Mexico from the Alabama 

 system west to Central Texas. 



