88 PROCEEDINGS OP THE ACADEMY OP 



ral appearance is that of a small Gobio or a Hybognathus, with the muzzle 

 rather heavier than is usual in either ; but examination shows that, besides 

 the absence of barbels, it is peculiar in that the suborbital and interopercular 

 bones, with the rami of the mandible, are greatly dilated, and bear septary 

 laminae, which separate mucous cavities, relatively as large as those of Acerina 

 or Percopsis. They extend in two series ; seven from the postorbital bone to 

 the side of the end of the muzzle, and eight from the same point to the sym- 

 physis mandibuli. The muzzle overlaps the mandible ; no cartilage on the 

 latter. Scales large, the usual surface exposed. Anal shoit, originating op- 

 posite end of depressed dorsal. Origin of ventrals opposite first dorsal ray. 

 Pharyngeal bones slender ; teeth acutely uncinate-raptatory, without masti- 

 catory surface, 4-1 0-4. 



I am not aware that any genus of Cyprinidae is known to exist in America 

 or the old world, which possesses the cavernous structure above mentioned. 

 Traces of it may be observed on the interoperculum in certain genera, e. g., 

 Hypsilepis. 



The suboperculum is small ; operculum height to breadth as one and one- 

 half to one. Head broad, muzzle obtusely rounded. Canthus of mouth op- 

 posite nares. Length of head contained three and five-sixths times to origin 

 of caudal ; greatest depth (at dorsal) nearly five times in the same. Caudal 

 peduncle elongate, not constricted. Eye large, contained a little more than 

 three times in length of head, a little more than frontal width. Origin of 

 dorsal a little in advance of the point midway between end of muzzle and 

 origin of caudal, its anterior ray equals half the distance from its base to an- 

 terior nostril. Caudal furcate one-half its length. Ventrals barely reaching 

 vent ; pectorals attaining ventrals. Scales 5 33 ; exposed portion with very 

 numerous and delicate radii and concentric lines, not visible to the naked 

 eye. A narrow space from vent to opposite middle of pectorals scaleless. 

 Fins, DI. 8. C.+17+. A. I. 8. V. 8. P. 12. Lateral line nearly straight. Along 

 and above it is a lateral band of brown punctulations ; general color above 

 yellowish olive, the edges of the scales dark-shaded, and a narrow brown ver- 

 tebral line from nape to tail. Below lateral line silvery. Dorsal and caudal 

 fins rosy. Length from muzzle to opercular edge 7 1. ; to dorsal fin 13 1. ; to 

 end of appressed anal 1 in. 9 1. ; to origin of caudal 2 in. 2 1. ; to end of caudal 

 2 in. 8 1. 



This species appears not to have come under the notice of Prof. Kirtland or 

 of Raiinesque. It may be called Ericymba b u c c a t a. 



Descriptions of Eight new species of TJNIO of the United States. 



BY ISAAC LEA. 



ITnio doliaris. Testa laevi, elliptica, valde inflatfi, inaequilaterali, postice 

 obtuse angulata, antice rotundata; valvulis subtenuibus, antice crassioribus ; 

 natibus promiueutibus, valde inflatus ; epidermide virido-lutea., radiis undique 

 indutis ; dentibus cardinalibtis erectis, acuminatis, compresso-conicis crenu- 

 latisque ; lateralibus sublongis, curvatis corrugatisque ; margarita alba et 

 valdfe iridescente. 



Hab. Etowah River, Georgia. Rev. G. White. 



Unio protensus. Testa laevi, late elliptica, subcompressa, valde inaequi- 

 laterali, postice subbiangulata, antice rotunda ; valvulis subtenuibus, antice 

 aliquantd crassioribus ; natibus prominulis ; epidermide tenebroso-fusca, 

 obsolete radiata, ; dentibus cardinalibus minimis, obliquis striatisque ; late- 

 ralibus pnelongis subcurvisque ; margariti vel caeruleo-alba vel salmonia, et 

 iridescente. 



Hab. North Carolina. Prof. E. Emmons. 



[May, 



