UNIO.— Plate LXXXYH. 



Species 467- (Copied from Conrad.) 



C^xio MELINUS. Vn. testa crassiuscula, veiitricosd, hi 

 medio mhretitsa, ovali, vix inatfuilaierall, nitidd, 

 luted, obsolete radiatd, costd umboiiali rotundatd, na- 

 tibus endneiitibus, acutis, confertim, et teimiter coii- 

 cenirice undidatis, vtargaritd alba ; dentibus cardbia- 

 libiis obli/juis ill ntrdque valvuld 2 ; lamellis laterali- 

 biis prodiictls, subcurvatis. 



The honey-yellow Unio. Shell tliickisb, vent.ricose, 

 somewhat indented in the middle, oval, seareely in- 

 equilateral, shining, dirty yellow, obsoletely rayed ; 

 umbonal ridge rounded; beaks prominent, acute, 

 with fine and close concentric undulations ; nacre 

 white ; primary teeth oblicjue, two in each valve ; 

 lateral lameUse produced, somewhat cui-ved. 



Conrad, Monog. Union. N. Am. pi. 56. f. 1. 



Hab. Salina Line, New York. 



There are many indistinct linear rays. U. siliqiioides 

 seems its nearest congener. 



Species 468. (Copied from Conrad.) 



Unio cerinus. Uh. testa subventricosd, mbrl/omhuideu, 

 siibinaiiuilaterali, postice late subbiangidnld, fidvo- 

 fuscd concolore, stMavigatd, inferne retusd, coda um- 

 bonali angulatd, ared posticd dorsali laid, umhonibus 

 hand eminentibiis ; margaritd albidd, passim cerco- 

 flavo fucatd; dentibus cardinalibus valid is, erect is, 

 trigouis ; lamellis lateralibus remolis, breuibus, rectis. 



The waxen Unio. Shell subventricose, subrhombic, 



subiiiequilateral, broadly subbiangulated behind, of 

 a iniiforni tawny brown, smoothisb, indented at the 

 lower edge ; umbonal ridge angular, hinder dorsal 

 slope broad, umboes not prominent; naere whitish, 

 here and there stained with wax-yellow ; primary 

 teeth strong, erect, triangular ; lateral laniellre dis- 

 tant, short, straight. 



Conrad, Monog. Union. N. Am. pi. .52. 



Nab. Southern States of N. America. 

 Allied to s/ibplaims. 



Species 469. (Mus. Brit.) 



Unio Lamprevanus. U/i. testa solidd, stibvc/itricosa, 

 ovato-siibtrigond, inferne arcuatd, antice brevi et la- 

 liore, concentrice late plicatd, nitidd, luteo-olivacea, 

 fiisco-viridi radiatd; umbonibus eminentibus ; lumdd 

 parvd, distinctd ; margaritd argented ; dentibus car- 

 dinalibus crassis, verticalibus, duplicibus, sulcatis ; la- 

 iiiellis lateralibus curvatis, elongatis. 



Lamprey's Unio. Shell solid, subventricose, subtrian- 

 gularly ovate, arched below, short and broader in 

 front, with broad concentric folds, glossy, yellow- 

 olive with brownish-green rays; umboes prominent, 

 lunule small and distinct, nacre silvery ; primary 

 teeth thick, vertical, two in each valve, grooved ; la- 

 teral lamellaj curved, elongated. 



Baird and Adams, Proc. Zool. Soc. 1867. p. 491. pi. 

 26. f. 2. 



Hab. Shanghai, North China. 



