186 ORTHALTCUS. 



Alt. 44, greater diam. 22, lesser 18, length of aperture 23, width 13 

 mill. (Martens). 



Popayan, Colombia, in the cold, elevated region, about 2400 

 meters above the sea (Dr. A. Stiibel). 



Liyuus (Hemibulimus) excisus \. MART., Conchol. Mittheil. ii, pp. 

 173, 160, pi. 35, f. 1, 2, 4,5 (shell) Liguus excisus SCHACKO, i.e., 

 p. 200, pi. 36, f. 1-4 (jaw and teeth). Hemibulimm magnificus Pfr. 

 v. MART. Nachtragliche Bemerkung, t. c. (Nov. 21, 1885). 



Genus ORTHALICUS Beck, 1837. 



Orthalicus Beck (in part), Index Molluscorum, p. 59 (for 0. sultan 

 B., zigzag Lain., princeps l&YQ(\.,pulchelhis Spix, undatus Brug., zebra 



Mull., livens B., pMogerus Orl., adamsoni Gray, B., rex B.) TRO- 



SCHEL, Zeitschr. f. Malak. 1847, p. 50, footnote ; Archiv f. Naturg. 

 1849, i. p. 228, as a genus for B. gallinasultana. VON MARTENS in 

 Albers, Die Hel., edit. 2, p. 171, type 0. zebra Mull. Orthalicus 



Sultana SIIUTTLEAVORTH, Notitiae Malac. i, p. 58 (1856) Ortha- 



liscus Beck, GRAY, P, Z. 8. 1847, p. 176, type Helix sultana. 



Shell imperforate, varying from ovate to oblong-conic, thin or solid, 

 with the nepionic shell composed of 2\ to 3\ densely thimble-pitted 

 whorls, the subsequent whorls either decussated or merely striate. 

 Aperture ovate, with the peristome either thin and simple, or thick, 

 expanded or broadly reflexed. 



Jaw and dentition similar to those of Oxystyla, or with the teeth of 

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

 penis (in 0. sultana) with a mere swelling in place of of the lohed 

 accessory gland or appendix of Oxystyla. 



Type, Helix sultana Dillw. Distribution, tropical and subtropical 

 South America, especially in the Andean region. 



Orthalicus was founded by Beck for a group of tropical American 

 snails previously described as Bulimi. While the " remarkable con- 

 chological instinct" of Beck enabled him to accurately assign the 

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

 his co-laborers until Troschel, in 1847-8, announced that the genus 

 had strongly marked anatomical characters, which caused him to 

 adopt it for the B. gallina-sultana, which he had dissected. About 

 the same time, Gray, in his list of molluscan genera with their types 

 (P. Z. S. 1847), nominated "Helix sultana" as type of the genus, the 

 name of which he misspells " Orthaliscus." These two authors by 



