Volume 2

Observations on the genus Unio / [Isaac Lea].

  • Isaac Lea
Date:
[1834-1874]
Catalogue details

Licence: Public Domain Mark

Credit: Observations on the genus Unio / [Isaac Lea]. Source: Wellcome Collection.

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    (Gmel.) and luteola (Lam.), (siliquoideus, Barnes). It perhaps most resembles the latter, but differs in being a smaller shell, in being more pearly, and in having the beaks nearer to the anterior margin. It is gene¬ rally found rayed, but in some individuals the rays are wanting; none of my specimens have perfect beaks. I have great pleasure in naming it after one of our most experienced conchologists and most assiduous students of this branch of zoology, Mr William Hyde. Unio interruptus. Plate VI. fig. 15. Testa elliptica, compressa, transversa,incequilaterali; valvulis subcrassis; radiis interruptis; natibus compressis; dentibus cardinalibus parvis; lateralibus longis subcurvisque; margarita alba. Shell elliptical, compressed, transverse ; inequilateral; valves somewhat thick ; rays interrupted; beaks compressed; cardinal teeth small; lateral teeth rather long and curved ; nacre white. Hab. Harpeth River, Ten. Professor Troost. My Cabinet. Cabinet of Professor Troost. Diam. *9, Length 1-5, Breadth 2*6 inches. Shell elliptical, compressed, transverse, inequilateral, subemargi- nate on the posterior dorsal margin; substance of the shell some¬ what thick; beaks rather prominent, somewhat compressed, undula¬ ted about the tip; umbones flattened; ligament rather short; epider¬ mis yellow, rather smooth; rays green, broad, interrupted, radiating to all parts of the margin; cardinal teeth small, conical, deeply cleft in the left valve; lateral teeth long, and somewhat curved, enlarged at posterior end; anterior cicatrices distinct; posterior cicatrices conflu¬ ent; dorsal cicatrices placed in the centre of the cavity of the beaks; cavity of the shell rather shallow; cavity of the beaks small and sub- angular; nacre pearly white.
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