186 "uniALiri 5. 



Alt. 44, greater diam. 22, lesser IS, length of aperture 2.">, width 13 

 mill. ( Mnrti'its). 



Popayan, ('<>/,, ,,//>/</, in the cold, elevated region, about 2400 

 meters above the .--a ( Dr. A. Stiiliel). 



/./(/mis ( Ifcniibuliiuiis) excisii* \. MART., Oonchol. Mittheil. ii, pp. 

 17.".. 1 liO, pi. 3o, f. 1. 2, 4, ") (shell). LitjiiHS r.rr/xt/s Si II.U K<>. t.C., 

 p. 2(10, pi. 36, f. 1-4 (jaw ami teelh). ffemiblllimus inaynificus Pfr. 

 v. MART. Nachtragliche Bemerkung, /. c. (Nov. 21, l^s;,,. 



Genus ORTHALICUS Beck, 1837. 



Orthaltcus Berk (in part), Index Mol!uscorum, p. oO (for 0. sultan 

 B., ziy.ii;/ Lam., princeps Bvoi\.,pulchellus Spix, mtdatus Brug., zebra 

 .Miill.. /iri'Hti B., pJiloyerits Orl., udamaoni (irav, B., re.f B.). Tno- 

 8CHEL, Zeitschr. t'. Malak. 1S47, p. 50, footnote; Arcliiv f. Naturg. 

 1S41I. i. p. 22s, us a genus for /?. guUiiximiltnim. Vox MARTKNS in 

 Alliers, Die He]., edit. 2. p. 171. type 0. zebra Miill ( hili/ilims 

 Sultana SuUTTLEWORTH, Xotitiae Malac-. i, p. . r S (1,S.")C)). Ortha- 

 l!<-us Beck, GRAY, P. Z. S. 1S47, p. 176. type Ilrli.c snltuwi. 



Shell im perforate, varying from ovate tn ohlong-conic, thin or solid, 

 with tlif in'ftiunic shell composed of ^ to 3\ densely thimble-pitted 

 ti-li'irls, the subsequent whorls either decussated or merely striate. 

 Aperture ovate, with the periMome either tliin and Dimple, or thick, 

 expanded or broadly reflexed. 



Jaw and dentition similar to those of Oxysfylo, or willi the teeth of 

 the median part of the radula hearing longer, pointed cusps ; the 

 penis (in 0. sultana) with a mere >welling in place <>!' of the loln-d 

 accessory gland or appendix of (h\i/sti//ti. 



Tvpe, Iltlis snltiinii Dillw. Distribution, tropical and subtropical 

 South America, especially in the Andean region. 



Ort/talictU was founded hy Beck for a group of tropical American 

 snails previously de-rrihed ;i> Hiiliitti. While the " remarkalde con- 

 chological instinct" of Beck enalih-d him to accurately aign the 

 Species then known to his new group, it was practically ignored by 

 his co-lal>orers until Troschtd, in 1S47-S, announced that the genus 

 had sti-onglv marked aiiatomii-al characlers, which caused him to 

 adopt it lor the H. gallina-tulfana, which he had di>secied. About 

 the xmne lini'-. (iray. in his li-l of mollu.-can genera with their types 

 (!'. /. S. is 17), nominated " /////'./ sulttnm " as type of the genus, the 

 name of which he misspell- O/v//<///.vr//\." These two authors by 



