12 DESCRIPTION OF NEW 
very distant, neither of the specimens having more than two, and two of them having 
only one line of growth. In outline it closely resembles U. strigosus, (Nobis,) but is a 
rougher shell, and thinner. 
Umio Tuomeyi. PI. XIIL. Fig. 4. 
Testa levi, elliplicd, subcompressa; valvulis subcrassis; natibus vix prominulis ; epidermide luteo-fusca ; 
dentibus cardinalibus subgrandibus ; lateralibus longis, subcrassis curvisque; margarita iridescente, colore 
salmonis tinctd. 
Shell smooth, elliptical, rather compressed; valves somewhat thick; beaks slightly prominent; epidermis 
yellowish-brown ; cardinal teeth rather large; lateral teeth long, rather thick and curved; nacre iridescent, 
salmon coloured. 
Hab. Abbeville District, S.C. J. P. Barratt, M. D. 
My cabinet and cabinets of Dr. Barratt and Mr. Tuomey. 
Diam. .8, Length 1.3, Breadth, 2.6 inches. 
Shell smooth, elliptical, rather compressed, subangular behind, rounded before, slightly 
angular on the posterior slope; substance of the shell somewhat thick; beaks slightly 
prominent, with minute undulations at the tip; ligament rather long and thin; epidermis 
yellowish-brown, shining, with indistinct rays on the posterior portion; cardinal teeth 
rather Jarge, somewhat pointed, single in the right and double in the left valve; lateral 
teeth long, curved and thickened at the posterior end; anterior cicatrices distinct; pos- 
terior cicatrices confluent; dorsal cicatrices placed in the cavity of the beaks; cavity of 
the shell shallow; cavity of the beaks small and slightly pa nacre iridescent and 
salmon coloured. 
Remarks.—There were seven specimens of this species among the shells sent to me by 
Dr. Barratt and Mr. Tuomey. ‘They are of different ages, and nearly allied to U. Barrattit, 
herein described, but may be distinguished by being more compressed and less transverse. 
All of the seven specimens before me have salmon coloured nacre, except one, which is 
mixed with a tinge of purple. Other specimens may likely be found with white and purple 
nacre. 
Unio Barratru. Pl. XU. Fig. 5. 
Testa levi, transversa, subinflata; valvulis subcrassis; natibus vix prominulis; epidermide virido-fused ; 
dentibus cardinalibus grandibus; lateralibus longis, subcrassis subcurvisque; margarité vel alba vel purpura 
vel colore salmonis lincla. 
Shell smooth, transverse, slightly inflated; valves somewhat thick; beaks slightly prominent; epidermis 
greenish-brown; cardinal teeth large; lateral teeth long, somewhat thick, and rather curved ; nacre white-purple 
or salmon coloured. 
Hab. Abbeville District, S.C. J. P. Barratt, M. D. 
My cabinet and cabinets of Dr. Barratt and Mr. Tuomey. 
Diam. .8, Length 1.3, Breadth 2.9 inches. 
Shell smooth, transverse, slightly inflated, angular behind and rounded before, angular 
on the posterior slope, subcarinate on the posterior dorsal margin; substance of the shell 
somewhat thick; beaks slightly prominent, with minute undulations at the tip; ligament 
