MELAMPUS. 157 



obtuse subcarinatus ; apertura subobliqua, angusta, ad basin expansior, 

 f long, sequans; perist. simplex, acutum, tenue, intus inerme, aut denti- 

 bus albis, transversis, 1-7, marginem non attingentibus, in liras decurren- 

 tibus, interdura in callo longitudinali positis, armatum ; paries aperturalis 

 callo nitente induta, et dente unica, alba, transversa, in aperturam intrante 

 armata; columella plicam unam, albam, ad basin excurrentem gerens ; 

 anfr. interni et axis absorpti. 



SYNONYMS AND REFERENCES. 



Melampns bideniatus Say, Journ. Acad. Nat. Sc. Phila. vol. ii. p. 245, July, 1822; 

 Binney's ed. p. 84. 

 KussELL, Journ. Essex Co. Nat. Hist. Soc. vol. i. part 2, p. 



67, anno 1839. 

 Pfeiffer, Mon. Auric. Viv. p. 45, (excl. Mel. borealis). 

 Adams, Genera, ii. p. 243, Sept. 1855, absq. desc. 

 Melampus biplicatus Pfeiffer, Mon. Auric. Viv. p. 21. 

 Melampus corneus Stimpson, Shells of N. E. p. 51, (absq. desc.) 



Beck, Ind. (absq. desc.) 

 Melampus f Jaumei Pfeiffer, Mon. Auric. Viv. p. 25. 

 Melampus Uneatus Beck, Ind. (absq. desc.) p. 107. 

 Auricula cornea Deshayes, Encycl. Meth. ii. p. 90; ditto in Lam. ed. 2, viii. p. 



339; ed. 3, vol. iii. p. 390, (1839). 

 Auricula bidentata Gould, Inv. Mass. p. 197, fig. 130. 



DeKay, N. Y. Moll. p. 57, t. V. fig. 92, 1, 2, 3. 

 KiJSTER, Chemn. ed. 2, Auric, p. 41, pi. vi. figs. 7-11. 

 Jay, Cat. 264, (absq. desc.) 

 Non Aurictila bidens Potiez et Michaud, p. 201, pi. xx. figs. 9, 10. 

 Auricula Jaumei Mittr'e, Rev. Zool. (Mars. 1841,) p. 66. 

 Auricula biplicata Deshayes, Encycl. Meth. ii. p. 91. 

 Conovulus biplicatus Beck, Ind. 106, (absq. desc.) 

 Melampus bidentatus var. Uneatus Say, 1. c. 

 Melampus bidentatus (3- Pfeiffer, 1. c. p. 46. 

 a. DeKay, 1. c. 



DESCRIPTION. 



Animal about as long as the shell, and the foot is trans- 

 versely bifid ; tentacula somewhat wrinkled, cylindrical, 

 rather smaller towards the tips, which are obtuse or round- 

 ed ; eyes placed at the inner base of the tentacula ; rostrum 

 somewhat wrinkled, nearly as long as the tentacula, bilo- 

 bate before ; foot, anterior segment emarginate behind, 

 posterior segment bifid at the extremity ; all above, with 

 the exception of the tentacula and rostrum, glabrous, 

 reddish-brown, beneath paler. (Say.) 



