DESCRIPTION OF FIFTY-TWO SPECIES OF TJNIONID.E. 31 



small, compressed and crenulate ; lateral teeth rather long, lamellar, corrugate and 

 slightly curved ; nacre whitish and iridescent. 

 Proc. Acad. Nat. Sci., 1872, p. 155. 



Hah. — Tellico River, Monroe Co., East Tennessee, Miss A. E. Law. 



My cabinet and cabinets of Dr. Lewis and C. M. Wheatley. 

 Diam. -7, Length 1-3, Breadth 1-7 inch. 



Shell smooth, rounded, compressed, lenticular, nearly equilateral, obtusely bian- 

 gular behind, round before ; substance of the shell rather thin, thicker before ; 

 beaks a little prominent ; ligament rather short, somewhat thin and light brown ; 

 epidermis dark brown or yellowish-brown, obscurely rayed and with close marks of 

 growth; urabonial slope rounded; posterior slope compressed, subcarinate; cardinal 

 teeth small, compressed, crenulate and very slightly curved; anterior cicatrices con- 

 fluent, well impressed; posterior cicatrices distinct and moderately impressed; 

 dorsal cicatrices placed on the upper side of the cavity of the beaks; cavity of the 

 shell shallow, dishlike ; cavity of the beaks rather shallow and obtusely angular ; 

 nacre white and iridescent. 



Remarks. — Several specimens are befoi'e me. The figured specimen is subcir- 

 cular and well characterizes the species. Some of the others are inclined to be 

 more oblique, particularly where the beaks have been much eroded. In outline it 

 is nearest to Chickasmvhensis (nobis), but not quite so round, nor is it so much 

 inflated. It is also a smaller species, has less robust cardinal teeth, and has closer 

 marks of growth. This species is allied to lens (nobis), but that is compact and 

 heavier. The rays on lenticularis are all, as those before me indicate, nearly obso- 

 lete. In young specimens the epidermis may be found to be yellowish-green and 

 the interrupted rays no doubt well developed. None of the specimens sent by Dr. 

 Lewis have beaks sufficiently preserved to exhibit undulations. 



Unio Tellicoensis. pi. 10, fig. 28. 



Testa Isevi, subtriangulari, subinflata, insequilaterali, postice obtuse angulata, antice rotunda; valvulis 

 crassiusculis, antice parum crassioribus ; natibus subprominentibus ; epidermide crocata, polita, 

 parum radiata; dentibus cardinalibus parvis, crenulatis, conicis ; lateralibus curtis, subcrassis 

 subrectisque ; margarita salmonis colore tincta et valde iridescente. 



Shell smooth, subtriangular, somewhat inflated, inequilateral, obtusely angular 

 behind, round before ; valves somewhat thick, a little thicker before ; beaks some- 

 what prominent ; epidermis brownish-saffron, polished, slightly radiated ; cardinal 

 teeth small, crenulate and conical ; lateral teeth short, somewhat thick and nearly 

 straight ; nacre light salmon color and very iridescent. 

 Proc. Acad. Nat. Sci., 1872, p. 155. 



