LIGUUS. 161 



Subgenus LIGUUS Montfort, 1810. 



Liynus MONTFORT, Conehyliologie Systematique ii, p. 422 (1810), 

 Sole species L. virgineus. 



Chersina (Humphrey, in part, Museum Calonnianum, p. 62, 

 1797) BECK, Index Moll., p. 74 (1837). 



Pseudotrochus (Klein, in part, Tent. Meth. p. 26, 1753) MORCH, 

 Catal. Yoldi, p. 21 (1852); Journ. de Conchyl. 1865, p. 390 (for 

 virginea L.) H. & A. ADAMS, Gen. Rec. Moll, ii, p. 135 (ex- 

 clusive of several species of Perideris). 



Oxystrombus (of Klein, in part, Tentamen Method! Ostracologicae, 

 p. 32, 1753) MORCH, Catal. Yoldi, p. 21 (1852); Journ. de Conchyl. 

 1865, p. 270 (for fasciatus Mull.). 



OrthaUcinus FISCHER & CROSSE, Miss. Scient. Mex., Moll, i, p. 

 436 (1875), type L. fasciatus. 



SheH imperf orate, oblong-conic, either thin or solid, the nepioriic 

 shell not differentiated from the subsequent whorls, smooth, or with 

 a few spiral bands of vertical wrinkles ; the later whorls smooth, 

 dull or glossy, white or vividly banded or streaked, pink, green and 

 yellow often entering into the color-scheme ; the cuticle, when pres- 

 ent, very thin and inconspicuous ; aperture rather small, ovate, the 

 outer lip acute and unexpanded, columella vertical, and varying from 

 heavy and abruptly truncated at the base (as in Achatina) to thin 

 and continuous with the basal lip ; always simple above. 



Jaw as in Oxystyla, Orthalicus, etc. Radula with the cusps either 

 all obtuse and rounded, or several in the median part longer and 

 pointed. The penis lias a lobed accessory gland or appendix, as in 

 other genera of the sub-family. 



Type Bulla virginea L. Distribution : Haiti, Cuba, with the Isle 

 of Pines, Cozumel Island, Southern Florida and the keys. Arboreal. 



The shell is generally less ventricose than in Oxystyla, not 

 spirally striated, and usually lighter or brighter colored. Corona is 

 more obtuse and less brilliantly colored, but is doubtless very closely 

 allied to Liguus. It agrees in the slight wrinkles of the last nepionic 

 whorl, cut into long granules, and the usually truncated columella; 

 though in both groups, this is a variable character. 



Of the names quoted as generic synonyms above, Chersina origin- 

 ally appeared in the anonymous sale- catalogue of M. de Calonne's 

 collection, and covered many diverse genera; its resurrection and 

 restriction by Beck in 1837 was long after Montfort had established 

 11 



