U N I 0. 



Plate XIX. 



Species 85. (Mus. Cuming.) 



Unio Mississippiensis. Un. testa oblonjd, postice sub- 

 lanceoJato-aiigulatd, antice rotundatd, Icfvigatd ; fiilvd, 

 oUcaceo tinctd, intense viridi copiuse radiald. 



The Mississippi Unio. Shell oblong, posteriorly some- 

 what lanceolately angular, anteriorly rounded, smooth, 

 fulvous, stained with olive, copiously rayed with 

 dark-green. 



CoNEAD, MS. in Mus. Cuming. 



Ilab. Mississippi River, North America. 



A dark-rayed species, peculiarly lanceolately angular on 



the posterior side. 



Species 86. (Mus. Cuming.) 



Unio rectus. Un. testa elongato-ovatd, antice latiore, 

 brevi, rotundatd, medio subcompressd, posiice attenuato- 

 prodnctd ; fulvo-olivaced, plus minus viridi radiatd. 



The straight Unio. Shell elongately ovate, anteriorly 

 broader, short, rounded, somewhfit compressed in the 

 middle, posteriorly attenuately produced ; fulvous- 

 olive, more or less rnyed with green. 



Lamarck, Anim. sans vert. vol. vi. p. 537. 



Mya 2'rtBlonga, Wood. 



Ihiio prtelongus, Barnes. 

 Hab. North America. 



A fine species of heavy substance, sometimes narvowf 

 and more lanceolate than the siieeimen figured. 



Species 87. (Mus. Cuming.) 



Unio Anodontoides. Un. testa elongato-ovatd, antice 

 brevi, rotundatd, postice acuminato-productd, leevigatd, 

 poind ; pallide cinereo-fulvescente. 



The Anodonta-like Unio. Shell elongately ovate, 

 anteriorly short, rounded, posteriorly acuminately 

 produced, smooth, polished; pale ash-fulvous. 



Lea, Trans. Amor. Phil. Soc. 1830; Obs. vol. i. y. '.»L 

 pi. 8. f. 11. 

 Unio teres, Conrad. 



Hab. North America. 



This species, as its name implie- 

 appearance of an Anodonla, but the si 



much 

 iliv thi 



