AHTICLE VIII. 



On the Patella Amcena of Say. By Isaac Lea. Read March 6, 1840. 



In a very able paper, published in the Boston Journal of Natural Science, 

 Mr. Couthouy gives an elaborate description of the animal of the Patella 

 Amcena of Say, and places it in a new genus established by Quoy and Gaimard, 

 under the name of Patelloida. From the description of the animal by the 

 French zoologists, and the minute one of Mr. Couthouy, there can be no doubt 

 of the propriety of this change, though the form of the shell gives little or no 

 indication of the great distinction developed by the anatomy of the animal. 



I agree fully with the American zoologist in the propriety of changing the 

 generic name of this Patella, but I do not see the propriety of retaining the 

 specific name Amcena, because it was first described by Miiller as Patella 

 testudinalis. Entertaining this opinion, I have consulted the authors who have 

 described this shell, and now offer the following synonomy: — 



Patelloida testudinalis. Lea. 



Patelloidea amsena. Couthouy. Bosl. Jour. Nat. Hist. vol. ii. p. 171. 

 Patella amaena. Say. Jour. Acad. Nat. Sci. vol. ii. p. 223. 



Patella testudinalis. Miiller Zool. Dan. p. 237. Deshayes' Lam. vol. vii. p. 543. Fabricius 



Faun. Groen. p. 385. Gmelin, p. 3718. Dillwyn, p. 1045. Wood's 

 Cata. No. 63. 

 Patella testudinaria. Miiller Zool. Dan. Kxmraerer, Rudolst Conch, p. 12, pi. 2, figs. 4 and 5. 

 Patella tessellata. Midler Zool. Dan. vol. iii. 2868. Dr. Beck's Letter. 

 Patella testudinaria Groenlandica. Chemnitz, vol. x. p. 325, pi. 168, figs. 1614, and 1615. 

 Patella Clealandii. Sowerby. Extracts from the Minute Book of the Linn. Sac. vol. viii. p. 



621. Fleming's British Animals, p. 287. 

 VII. — T 



