NEW UNIONII).!-; 01" TIIK liMTKI 



Unio IIartjianianus. PI. 8, 



_>, 11.,. — .-,. 



Testa lasvi, oblique triangulari, crassa, tumida, postice subbiangulari, inaequilatcrali ; valvulis percrassis, 

 antice crassioribus ; natibus valdu elevatis, crassis; epidcrmide tcnebroso-fusca, postice luteola, eradiata ; 

 dcntibus cardinalibus subgrandibus, erectis, conipress>is, corrugatis, in utroque valvulo duplicibus; 

 lateralibus brcvibus, percrassis, oblii|ui8 corrugatisque ; inargarita argentea ct iridcsccntc. 



Shell smooth, obliquely triangular, thick, swollen, somewhat biaugular beiiind; 

 valves very- thick, thicker before; beaks very much raised, thick; epidermis dark 

 brown, yellowish behind, eradiate ; cardinal teeth rather large, erect, compressed, cor- 

 rugate, double in both valves; lateral teeth very thick, oI)lique and corrugate; nacre 

 silver white and iridescent. 



Proc. Acad. Nat. Sci. 1860, p. 307. 



Eiib. — Coosa River, Wetumpka, Alabama. E. R. Showaltor. iAI. I). 



My cabinet, and cabinets of Dr. Ilartman and Dr. Showalter. 

 Diani. -1, Length l?>. Breadth 1-5 inch. 



Shell smooth, obliquely triangular, thick, swollen, subbiangular behind; substance 

 of the shell very thick, thicker before ; beaks very much raised and thick ; ligament 

 thick and short; epidermis dark brown, yellowish behind, without rays, shining 

 towards the beaks, striate below, and with rather distant marks of growth ; umbonial 

 slope raised and very obtusely angular ; posterior slope broad, flattened, yellowish, 

 with a slight broad furrow from the beaks to the posterior margin ; cardinal teeth 

 rather large, erect, compressed, corrugate, double in both valves ; lateral teeth very 

 thick, oblique, corrugate; anterior cicatrices distinct, rather small, but well 

 impressed ; posterior cicatrices distinct and very well impressed ; dorsal cicatrices 

 placed above the centre of the cavity of the beaks ; cavity of the shell rather deep 

 and rounded; cavity of the beaks shallow and obtusely angular; nacre silver white 

 and iridescent. 



Remarlcs. — Two specimens are before me, nearly of the same size. It is very 

 near to fulgklus (nobis), but is a rather larger species, and not so shining. It belongs 

 to that group of which solidus (nobis) may be considered the type. The lateral -teeth 

 are thick and short, and that of the right valve is disposed to be double. I owe the 

 jjossession of one of the two specimens to W. D. Hartman, M. D., after whom I have 

 great pleasure in naming it. They were sent to him by Dr. Showalter. A larger 

 specimen of this species, or very closely allied, was received many years since from 

 President Estabrook, taken by hini in Clinch River, Tennessee. A specimen al)out 

 one-third grown has very obscure rays on the middle of the disk. 



Unio Showalterii. PI. 8, fig. 22.3. 



Testa livvi, subrotundii, crassa, sublenticuiari, wquilaterali ; valvulis crassis, antice crassioribus ; natibus ele- 

 vatis, tumidis; epidcrmide tencbroso-fusca, obsolett' radiata; dcntibus cardinalibus cra.ssis, erectis. 



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