Binney on Terrestrial Molliisks. 157 



obtuse subcaviiiatus ; ajuTtiira subobliciua, an^usta, ad basin expansior, 

 I Ion". iiMiuaiis; porist. siniplcx, aoutuin, tt'nuc, intus incrme, aut dcnti- 

 bus albis, transversis, 1-7, niarginom non attingentibus, in liras dccurren- 

 tibus, interdum in tallo longitudinali positis, arniatum ; paries aporturalis 

 callo nitcntc indiita, ot dentc nnicfi, albfi, transversa, in aperturani intrantc 

 arniata ; eoUunella plieani unam, albani, ad basin excurrentem gerens ; 

 anfr. interni et axis absorpti. 



SYNONYMS AND REFERENCES. 



Melavipus bidentatus Say, Journ. Acad. Nat. Sc. Phila. vol. ii. p. 245, July, 1822; 

 Binney's e<l. p. 84. 

 EussKLL, .Toiini. Essex Co. Nat. Hist. Soc. vol. i. part 2, p. 



67, anno 1839. 

 Pfeiki-ek, Jlon. Auric. Viv. p. 45, (excl. Mel. borealis). 

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

 3ftlampus biplicatus Pfeiffer, Mon. Auric. Viv. p. 21. 

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



Beck, Ind. (absq. desc.) 

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

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

 Auricula cornea Deshayes, Encycl. ISIeth. ii. p. 90; ditto in Lara. ed. 2, viii. p. 



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

 Awicula bidentata Gould, Inv. JIass. ]). 197, fig. 130. 



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

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

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

 Non Aw-iculn Udens Potiez et Michaud, p. 201, pi. xx. figs. 9, 10. 

 Auricula JoMwei Mittre, Rev. ZoiJl. (Mars. 1841.) p. 6C. 

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

 Commdus biplicatus Beck, Ind. 100, (absq. desc.) 

 Melampus bidentatus var. lineatus Say, 1. c. 

 Melampus bidentalus [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.) 



