12 DliSCUll'TlON OF NEW 



very distant, neillicr of the speciiHcns liaviiig more than two, and two of tlieni having 

 only one hne of growth. In outhiic it closely resembles V. slri^^ostis, (Nobis,) but is a 

 rouifhcr shell, and thinner. 



Umo Tuomevi. pi. XIII. Fig. 4. 



Teslti lievi, ellipliccU sitlmmprcsiiu; vulvtilis subcrussis; natilws vix prominulh ; epidermidc luleo-fusdt ; 

 denlibus curdinalibus siibgrundibiis; lutcrulibus longis, aubcramsis curvisque; margurila iridetscenle, colore 

 salmoiiis linctii. 



Sliull smoolli, elliptical, rather compressed; valves somewhat thick; beaks sligluly prominent ; epiilermis 

 yellowish brown ; cardinal teeth rather large; lateral teeth long, rather thick and curved; nacre iridescent, 

 salmon coloured. 



llab. Abbeville District, S. C. J. P. Rarratt, M. D. 



My cabinet and cabinets of Dr. liarratt and Mr. Tuomey. 

 Diam. .8, Length 1.3, Breadth, 2.G inches. 



Shell smooth, elliptical, rather compressed, snbangular 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 large, somc>\liat 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 angular; nacre iridescent and 

 salmon coloured. 



linnarkii. — There were seven specimens of this species among the shells sent to me by 

 Dr. liarratt and Mr. Tuomey. They are of diiferent ages, and nearly allied to I/. Barrattii, 

 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 Barratth. pi. XIII. Fig. 5. 



Test('i fievi, transversa, sxibinjiutd; valvii/is sttbcrassis; natibus vix prominuHs ; rpidermide vlrido-fiisra ^ 

 (lenlibvs cardina/ibi/s grundibus; laleralibus longis, subcrassis sitbcurvisquc; margurild vcl alba vol purpurd 

 vel colore aalmonig linctd. 



Shell smooth, transverse, slightly inflated; valves somewhat thick; beaks slightly prominent; epidermis 

 greenish-brown; cardinal teeth large; lateral teeth long, aomewhal thick, and rather curved; nacre white-purple 

 or salmon coloured. 



ITab. Abbeville District, S. C. J. P. Barratt, M. D. 



My cabinet and cabinets of Dr. Barratt and Mr. Tuomey. 

 Diam. .8, Length L3, Breadth 2.9 inches. 



Shell smooth, transverse, slightly inflated, angular behind and rounded before, angular 

 nil the posterior slope, subcarinatc on the posterior dorsal margin; substance of the shell 

 somewhat thick ; beaks slightly prominent, with minute undulations at the tip; ligament 



