AURIS. 95 



convex, rapidly enlarging, the last elongated, deeply descending in 

 front, rounded at base. Aperture oblique, oval, concolored within ; 

 peristome white, somewhat thickened, narrowly expanded and re- 

 flexed, the margins joined by a whitish callus ; columellar margin 

 dilated, half-covering the umbilical chink. (/>.) 



Alt. 43, diam. 18 ; aperture, alt. 11, width 13 mill. 



Alt. 37, diam. 17 ; aperture, alt. 10, width 12 mill. 



Sonson, prov. Antioquia, U. S. of Colombia (Wallis). 



Bulimus semperi DOHRN, Jahrb., D. M. Ges., ix, 1882, p. 103, 

 pi. 3, f. 3-5. 



Described from two specimens in O. Semper's collection. It 

 stands rather isolated among the Colombian Eurytus species, and 

 resembles most B. floccosus Spix, in general figure ; but it differs 

 widely from all allied species in the unusually small aperture. 



Genus AURIS Spix, 1827. 



(= Pachyotus -\- Peleeychihis -f- Goniostomus -f- Anthinus of au- 

 thors). 



Auris SPIX, Testacea Fluviatilia Brasiliensia, p. 13, (for A. 

 melastoma = Bulimus melanostomus Auctt.) ; also, p. 17, for A. sig- 

 nata ; and lower legend on pi. 12. GRAY, List of the Genera of 

 Recent Mollusca, their Synonyma and Types, in P. Z. S., 1847, p. 

 175 (type Bui. melanostomus). Not Auris Klein, Tent. Meth. Ostr., 

 1753,=Haliotis (pre-Linnsean). 



Pachyotus (in part) BECK, Index Molluscorum, p. 56 (for alope- 

 cotis = aurisvulpina, bilabiatus, melanostomus, rhodospira = ilhecola, 

 iostonui). GRAY, List of Genera, etc., P. Z. S., 1847, p. 175 (type 

 Vol. aurisvulpina). HERRMANNSEN, Ind. Gen. Malac., ii, p. 187 

 (type B. melanostomus Swains.). ALB., Die Hel., p. 148. ALBERS- 

 MARTENS, Die Hel., 1860, p. 190 (type B. melanostomus Swains.). 

 Not "Pachyofa Agas. in Charp., Cat. Moll. Suiss., 1837," so quoted 

 in Nomencl. Zool., Moll., p. 64, but not to be found in Charpentier's 

 Catalogue. 



Otostomus BECK (in part) Index Moll., p. 55 (for signatus, myotis 

 = aurismuris, lateralis and lagotis = aurisleporis, navicula). 

 GRAY, List of Genera of Rec. Moll., their Syn. and Types, P. Z. S., 

 1847, p. 174 ("type .4. signata). HERRMANNSEN, Ind. Gen. Malac., 

 ii, 1847-1849, pp. 179, 180 (type B. signatus). Not Otostomus ALB., 

 Die Hel., 1850, p. 152; ALB.-MART., Die Hel., 1860, p. 210 (type 

 aurisleporis). 



