OXYSTYLA. 101 



( Orthalicus s. str. 

 Orthalicus -j __ 



( MetorttiaMcus. 



/ Liguus s. str. 



Liguus ....-< Hemibulimus. 

 ( Corona. 



Oxystyla . . . - ' 8tr ' 



( Porphyrobaphe. 



Orthalicus, in the sense here intended, includes South American 

 species only, the restricted subgenus pertaining to 0. gallina-sultana 

 and its immediate allies; Metorthalicus being a new subgenus for spe- 

 cies with pitted apex and thick or reflexed lip. 



Liguus may well include Corona and Hemibulimus until some char- 

 acters of importance are found to separate them. The nepionic shell 

 generally has some longitudinal wrinkles, and the columella is fre- 

 quently truncated below. 



Oxystyla is the earliest name for the so-called Orthalicus of Mexico 

 and the West Indies, the type being the common 0. undaius Brug. 

 The group Porphyrobaphe, type iostoma, is rightly only a subordinate 

 group to Oxystyla, toward which it bears a relation parallel to that 

 held by Metorthalicus toward Orthalicus. On account of its consid- 

 erable superficial modification, Porphyrobaphe will probably be con- 

 sidered to rank as a genus, though its claims to that position are 

 presumptuous. 



It will be seen that in any case, the B. undatus group cannot be 

 called "Orthalicus." If Oxystyla be not recognized as a valid genus, 

 the species will revert to Liguus, its next of kin. 



Genus OXYSTYLA Schliiter, 1838. 



Oxystyla SCHL()TER, Kurzgefasstes systematisches Verzeichniss 

 meiner Conchyliensammlung (Halle, 1838), p. 7; Sole species undata 

 Schliit. = B. undatus Brug. Zebra SHUTTLEWORTH, Notitise Con- 

 chologicse, i, p. 60 (1856). PFR., Nomencl. Helic. Vivent., 1878, p. 



258. Orthalicus and Bulimus sp. of some authors Ortalichus v. 



MARTENS, Biologia Centrali-Americana, mollusca, p. 179 (May, 

 1893). 



For anatomy, see Crosse & Fischer, Miss. Scient. Mex. Moll., p. 

 429; Binney, Ann. N. Y. Acad. Sci. iii, p. 128; Strebel, Beitr. 

 Mex. Land- und Siisswasser-Conchyl., Heft v; Semper, Reisen in 

 Archip. Phil., Landmoll., p. 248. 



