300 • ORTMANN— CORRELATION OF SHAPE AND 



Uiiio striatissimiis Anthony, '65 (Tennessee). 



Dia. 30 per cent. 

 Uiiio planior Lea, '68 (Tennessee; Holston R., Washington Co., 



Va.). — Pleurohcma planius Simpson, '14, p. 302. 



Dia. (Lea) : 35 per cent.; (Simpson) : 33 per cent. 

 Unio brevis'Lea, '72 (Conasauga Cr., Monroe Co., Tenn.). — Pleuro- 



bema breve Simpson, '14, p. 800. 



Dia. (Lea) : 35 per cent.; (Simpson) : 36 per cent. 

 Unio sivordianus Wright, '97 (Powell R., Lee Co., Va.). — Pletiro- 



bema sword. Simpson, '14, p. 757. 



Dia. (Simpson) : 40 per cent. These measurements are taken 



from an extremely obese specimen. Other specimens in the original 



lot all fall below 40 per cent. 



3. Pleurobema oviforme holstonense (Lea). — Dia. 50 per 



cent, or over. 



Unio holstonensis Lea, '40 (Holston R.). — Pleurobema hoist. Simp- 

 son, '14, p. 739. 

 Dia. (Lea) : 54 per cent. ; Simpson) : 50, 56, 58 per cent. 



Ufiio mundiis Lea, '57 (Tennessee R., Ala.). — Synonym to holston- 

 ense, according to Simpson. 

 Dia. (Lea) : 64 per cent. 



Unio tcsserula Lea, '61 (Nolichucky R., Tenn.). — Pleurobema tess. 

 Simpson, '14, p. 749. 

 Dia. (Lea and Simpson) : 64 per cent. 



Unio pattinoides Lea, '71 (Clinch and Holston). — Synonym to 

 holstonense, according to Simpson. 

 Dia. (Lea) : 51 per cent. 



Unio acuens Lea, '71 (Tennessee R., Concord, Tenn.). — Pleuro- 

 bema acuens Simpson, '14, p. 746. 

 Dia. (Lea) : 55 per cent. Simpson's measurements give 48 per 



cent., and thus belong to typical oinforme. 



Unio lawi Lea, '71 (Tennessee R., Tuscumbia, Ala., Holston R.). — 

 Synonym to holstonense, according to Simpson. 

 Dia. (Lea) : 56 per cent. 



Unio bellulus 'Lea, '72 (Holston R. ; Tennessee R., Mussel Shoals, 

 Ala.). — Synonym to holstonense, according to Simpson. 

 Dia. (Lea) : 64 per cent. 



