160 LIGUUS. 



some uneasiness to Strebel ; but Mousson evidently did not actually 

 see any such sculpture, but merely inferred it. The nepionic shell is 

 smooth. 



(?) B. VICTOH Pfeiffer. See vol. x, p. 82. I have not seen this 

 species, but following Pfeiffer, placed it in Enrytus. Cousin has re- 

 ferred it to Porphyrobaphe (Bull. Soc. Zool. France xii, p. 204), and 

 states that he procured it in Ecuador, precise locality not given. 



PORPHYROBAPHE PEELii Miller, Mai. Blatt. xxv, 184 = Urymceus 

 peelii,\o\. xi, p. 205. 



Genus LIGUUS Montfort (s. lot.). 



Li guns Montf. + Corona Alb. -f- Hemibiillimis Martens. 



Shell oblong- or ovate-conic, with simple, thin-edged, unexpanded 

 lip, ami obtuse, vertically wrinkled or smooth nepionic whorls, the 

 columella usually truncated at its base, though sometimes continuous 

 with the basal lip, and either concave, folded, or straight above. 



The present group differs from Orthalictis in the sculpture of the 

 nepionic whorls ; from Ojrystyla in the more lengthened general 

 form, usual though not invariable truncation of the columella, and 

 the vertical wrinkles of the nepionic shell, or the last nepionic whorl; 

 a character frequently lost in old shells by wear, but probably in- 

 variable in the young. 



The genus as limited above, is nearly coincident in distribution 

 with the Helicoid genus Plfurodonte, inhabiting the two largest West 

 Indian islands and the northern and north-western parts of South 

 America. And as Plenrodonte is represented in South America by 

 two peculiar sections, Labyrinthus and Isonicrid. so f.ii/inif :ippe;irs 

 on the continent in forms (Corona and Hemibulimus) differing from 

 the Antillean. 



The suhgenera of Lii/m/s may be arranged thus: 



I.ii/inix (in the narrow sense): Antillean forms with white or 

 bright colored shell, rather small apex, and strictly arboreal habits. 



ll< inilnilhitHx : Colombian forms with the shell dark, somber col- 

 ored, the columella concave above, truncated below ; habits probably 

 terrestrial. 



('IJ/-IIIKI: South American forms with the shell strong, apex obtuse 

 as if cut off', the columella with a callous fold above, colors not 

 vivid. 



