Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . The old shell might perhapsbe mistaken for a variety of the U. rectus, but theyoung has very little resemblance to that of the dilatatus is fomid in company with this species,retaining all the peculiarity of habit which it pos-sesses in the Ohio and other tributaries of the Missis-sippi, which confirms our opinion that the shell wedescribed above is new and distinct. UNIO LAPILLUS. Plate XXIX.—Fig. 2. DESCRIPTION. Shell suboval, thick, yellowish, with very numerousdark green
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . The old shell might perhapsbe mistaken for a variety of the U. rectus, but theyoung has very little resemblance to that of the dilatatus is fomid in company with this species,retaining all the peculiarity of habit which it pos-sesses in the Ohio and other tributaries of the Missis-sippi, which confirms our opinion that the shell wedescribed above is new and distinct. UNIO LAPILLUS. Plate XXIX.—Fig. 2. DESCRIPTION. Shell suboval, thick, yellowish, with very numerousdark green undulated rays; anterior margin not veryshort, rounded; beaks but little elevated, simple; liga-ment margin declining gradually in an arcuate line;posterior extremity rounded; umbonial slope unde-fined; basal margin straight or slightly contracted inthe middle; within pearly white; cardinal teeth direct,thick; lateral teeth thick, oblique; cicatrices very deepand rounded; cavity of the beaks almost obliterated. SYNONYMES. U. lapillus, Say. Trans. Journ. of Med. vol. iv. p. 528, , pi. 41. 9J). y
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
