1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 285 



.sui>posed to be an Odosfomia. Under tbe circuiiistaiices it would seem 

 probable that Bivona\s geuus was a beterogeueous assembly, and that 

 he did not name any type, and that it were better to defer its adoption 

 or rejection until its scope can be definitely ascertained. If his first 

 species be taken as type Oratella would be synonymous with Melamxms. 

 There are two si)ecies of Lenconla described by Pfeifter from Cuba, of 

 which the collection contains no s])ecimens. 



Subgenus Deteacia Gray, 



Diirada Gray, Tnrton's Mau., ed. 2, p. 20. 1810. 



Tifata H. & A. Adams, Geu. Kec. Moll., ii, p. 245, Sept., 1855. 



lornatella, sp., F6riissac. Tralia, sp., Biiiuey after Adams. 



Shell elongated, solid, rounded to a i)oint at both ends; parietal re- 

 gion with a thin callus but no teeth or lirre ; one strong plait on the 

 columella; a])erture very narrow; outer lip lirate within, simple and 

 acute at the margin. Type Yolnia huUadides Montague. 



Melampus (Detracia) biilicides iMoDt;!gue (em.). Plate 18, fig. 7. 

 Vohita bnUaoldes Montagne, Test. Brit., p. 339, pi. 30, f. 4, 1803. 

 Auricula mitltivolris Jeffreys, of. Brit. Coiicli , v, p. 109, 1869. 

 Auricula chigulalaFfr. , Wiegm. Arcli., 1, p. 251, 1840. 

 Auricula olira D'Orbiguy, Moll. Ciil>n, i, p. 189, pi. siii, figs. 8-10, 1841. 

 Mdampus bulla Lovre, Beck Iiid. Moll , p. 108, 1838. 

 Auricula sienostoma Knster, 2d ed., Chemn. Conch. Cab., p. 40, y>1- 6, figs. 4-6 



(olim iu iudes). 

 Melampus ciugulatun Pfr., Mon. Anr. Viv., p. 18, W. G. Biim., Terr. Moll. U. S., 



vol. iv, p. 161, pi. Ixxv, figs. 12. 13, 1859. 

 Tralia cingulaia W. G. Binney, L. and F. W. Sli. N. Am., ii, p. 18, 1865. 

 Melampus variabilis Gassies, fide Rve. Conch. Icon. Anr., pi. vi, f. 46. 

 Melampus Poeiji Pfr., Zeitschr. fiir. Mai., p. 126, 18.53 ; Mon. Anr. Viv., -p. 17, fide 



Araugo, Moll. Cuhana, p. 58. 

 Defracia bullaoides Gray, Tnrt. Man. Brit. Sh., p. 20, 1840; P. Z. S., 1847, p. 179. 

 Detracia ciiu/ulata Fischer, Man., p. 501, 1883. 

 Tifata ciugulara H. & A. Adams, Gen. Rec. Moll., ii, p. 245, 1855. 



Rabitat. — Florida, Bartlett; Cedar Keys, Stearns; Key West, Hemj)- 

 hill. Captain Pickering; West Indies, various authors; Cuba, Arango; 

 Tifew Caledonia, Eeeve (?). 



I cannot discover any printed description of the soft parts of this 

 species. It is put with the Trcdias, which have the foot not transversely 

 divided and not bifid behind, by the brothers Adams, and with Mclaminis, 

 which has the opposite characters, by Fischer. As the latest authority, 

 I follow the latter; but the facts should be determined by some one on 

 the ground from the living animal, as alcoholic specimens are often so 

 contracted as to be difficult to properly interpret. The nucleus is in- 

 verted; the microscopic revolving lines are often wanting over the 

 greater part of the whorl. 



Montague and Jeffn^ys described exotic specimens under the erro- 

 neous idea that they were British. It is believed to be confined to the 

 Autillean region. 



