544 Mr. Lea on the JVaiades. 



U. venlricosus of Barnes, in Silliman's Journal for May, 1823. 

 This is confirmed by Mr. Say, in Am. Conch. No. 4, for March, 

 1832. Mr. Say's is a finer example, and the figure much better 

 executed. There can be no mistake here. Lea says the occidens 

 differs from the ventricosus in not being globose over the um- 

 bones. This may be in some shells. 



U. oriens. — Lea. Tr. A. P. S. 4. P. vi. fig. 5, is the U. dehiscens of 

 Say, in N. H. Disseminator, Oct. 7, 1829, and since in Am. Conch. 

 No. 3, P. 24. It is amusing to see how ingeniously Lea has manag- 

 ed this plagiarism in the description. Say, in his description, says, 

 " Transversely much elongated." Lea, has, " Shell longovate 

 transverse." Say, " Thin." Lea, " Substance of the shell very 

 thin." Say, " pale yellowish brown, radiate, with abbreviated 

 lines of green." Lea, "yellowish, with oblique interrupted green 

 rays." 



U. trapezoides.—Lea. Tr. A. P. S. 4. P. 3. fig. 1, is the U. 

 interruptus of Say in Transyl. Jour. 4. p. 525, and since in Am. 

 Conch. No. 4. 



U. Multiplicatus — Lea. Tr. A. P. S. 4. P. 4. fig. 2, is the U. 

 heros of Say in Am. Conch, No. 2. Mr. Say appears disposed 

 to abandon his name of heros, in favour of Barnes's undulalus, 

 which he thinks identical. The shells are, however, distinct ; 

 and Mr. Say's candour is not to operate to his prejudice. Lea 

 does not even mention Say's heros, but avails himself of Mr. 

 Say's hesitation, to occupy his place, by substituting multipli- 

 catus. We have here another travesty. Say. Unia heros. Sept. 

 23, 1829. "Transversely oval, with large distinct undulations 

 three or four in number, directed towards the anterior margin, 

 and not proceeding directly from the umbo : hinge margin com- 

 pressed." Lea. U. Multiplicatus, 1831. " Obliquely transverse, 

 undulated, except near the anterior margin — undulations diverge 

 from the umbonial slope. Compressed towards basal and poste- 

 rior margins." 



U. Ellipsis.— Lea. Tr. A. P. S. 2. P. 4. fig. 4, is U. olivaria 

 of Rafinesque. (Translation of the monograph.) We have here 

 another instructive specimen of the art of appropriating olhcr 

 jnen's thoughts. linfinesquc. U. olivaria, September, 1820. 

 " Shell thick, somewhat ventricosc, oval, elliptical, epidermis 

 wrinkled, olive coloured, nacre white, iridisccnt." Lea. U. El- 

 lipsis, Nov. 1827. " Shell very thick, ventricosc, margin cllip- 



