Mr. Lea o?i the Naiades. 545 



tical, epidermis reddish brown, surface somewhat wrinkled. — 

 Nacre pearly white, silvery, and iridiscent," &c. 



U. irroratus. — Lea. Tr. A, P. S. 2. P. 5. fig. 5, is U. stegaria. 

 var of Rafinesque. Trans. Mon. p. 51. 



U. platiulatus.— Lea. Tr. A. P. S. 3. P. 9. fig. 13, is U.fascio- 

 laris of Rafinesque. Monog. p. 30. Dr. Hildreth, in Silliman's 

 Journal, vol. xiv. No. 2, Jan. 1828, has overlooked Rafinesque's 

 prior right to this species, and has described it under the name 

 of U. pJiaseolus, which Mr. Say, erroneously, has recognised in 

 his Am. Conch. No. 3. PI. 22. Barnes also, in Silliman, vol. vi. 

 for May, 1823, seems to have indicated this shell in his U. mu- 

 ero7iatus. Mr. Lea who is a man of " nice discrimination," and 

 who has severely criticised Dr. Hildreth's labours, thought that 

 as this last gentleman had overlooked Rafinesque's yflsao/«n's, it 

 would not be very criminal in him to overlook the phascolus, and 

 substitutes planulatus for the name of the original discoverer ! 



U. circulus. — Lea. Tr. A. P. S. 3. P. 9. fig. 14, is U. striata, 

 var rosea of Rafinesque, Monog. p. 50. Dr. Hildreth named 

 this shell in Silliman's Jour. Jan. 14, 1828, U. orbiculatus, which 

 Lea reproaches him with, saying it is another name for U. torsus 

 of Rafinesque. Having thus settled the matter, he proceeds to 

 describe the shell, which he declares to be a new species, U. 

 circulus, nobis! In Wood's conchology, this shell is called U. ro- 

 tunda, whereupon the eulogist, thinking to do wonders, says, " U. 

 rotundata, Lamarck, the circulus of Lea," not dreaming that 

 if Lamarck had named it. Lea had no right to name it over 

 again. Such is the way in which some people are served by 

 their friends. In describing this shell. Lea has done nothing 

 more than amplify what Rafinesque had said in 1820. Rafi- 

 nesque. Unio striata, var rosea, Monog. 1820. " Shell thick, 

 ventricose, rounded inferiorly, with striated wrinkles, epidermis 

 brown anteriorly. Nacre white, the variety roseate." Lea. U. 

 circulus, 1827. "Shell round, very ventricose, transversely, 

 wrinkled, epidermis anterior to the umbonial slope, dark brown, 

 posterior, light yellow brown. Nacre white, pearly, rarely tinted 

 with rose in the centre." 



U. palulus,—Lea. Tr. A. P. S. 3. P. 12. fig. 20, is the U. 

 cuneata of Raf. Monog. p. 53. 



U. rubiginosu.^.— Lea. Tr. A. P. S. 3. P. 8. fig 10, is V.Jlava 

 of Rafinesque, Monog. p. 38. 



Vol. I.~69 



