156 AMERICAN JOXJRlSfAL 



Unio distaxs, Antliony. — t. 13, f. 2. 



Description. — Shell smootli, elliptical, sliglitly inflated, 

 rather thick ; beaks somewhat prominent, finely and closely 

 undulated at tip ; epidermis yellowish-olive, relieved by 

 beautiful dark-green rays over the umbones and anterior 

 portion of the shell, while the posterior end, which is some- 

 what truncate and subangulated, is also darker in color, 

 often of a blackish-brown ; cardinal teeth double in both valves ; 

 posterior lobe of the right valve triangular, compressed, 

 pyramidal and striated ; anterior lobe small, pointed ; the 

 anterior lobe of the teeth in the left valve is narrow, conical, 

 pointed, and the posterior lobe less elevated ; the cleft be- 

 tween them is very deep and rather broad ; nacre white and 

 iridescent. 



Dimensions. — Diameter f inch ; length 3 inches ; breadth 

 If inch. 



Sahitat. — Ohio. 



My Cabinet. 



Observations. — In form and general appearance not unlike 

 U. siliquoideus, Barnes, but varies in several particulars, being 

 more elongate, less inflated, and having its marks of growth 

 stronger and darker in color ; the green rays are also of a 

 different shade and more interrupted. The epidermis is only 

 moderately shining, never possessing the brilliant, shining 

 surface of siliquoideus. 



Unio deviatus, Anthony. — t. 12, f. 2. 



Description. — Shell smooth, elliptical, moderately thick ; 

 epidermis olivaceous, with delicate, fine, capillary rays over 

 the umbones and posterior part of the shell, obsolete on the 

 anterior portion ; beaks not elevated, very much eroded in all 

 the specimens observed, but apparently never undulated; 

 ligament very short and thin ; cardinal teeth in the right 

 valve long, curved and striate, or crenulate ; in the left valve 

 they are double, erect, slightly curved, and both deeply and 

 widely cleft ; anterior cicatrices distinct and well impressed ; 

 posterior cicatrices confluent ; nacre Avhite and iridescent on 

 the posterior margin. 



Habitat. — Tennessee. 



My Cabinet. Cabinet of Hugh Cuming, London. 

 Mus. Comp. Zoology, Cambridge, Mass. 



Observations. — Belongs to a group of which V. capsseformis, 

 Lea, U. Haysianus, Lea, and U. interruptus, Raf., are promi- 



