CYLINDRELLIDA. 67 
peristome free, reflected. C. decollata, Nyst. 30 sp. Hayti, 
Jamaica, ete. 
APoMA, Beck, 1837. (Casta, Albers, 1850.) Shell sinistral, 
cylindrical, subulate ; whorls numerous, oblique, the last scarcely 
free, carinated at the base; aperture oblong, ciicular, peristome 
expanded. C. gracilis, Wood (xcix, 48). 3 sp. Jamaica. 
CALLONIA, Crosse and Fischer, 1870. Shell subulate, truncated, 
many-whorled, whorls ribbed across; last whorl free, declining, 
angulated; aperture subquadrangular; peristome simple, ex- 
panded. C. EHlliottt, Poey (xcix, 49). Cuba. 
GONGYLOSTOMA, Albers, 1850. Shell cylindrically fusiform or 
conically turreted, apex attenuated, costulately striate; whorls 
9-20, the last more or less protracted, narrow, sometimes obso- 
letely angulate; aperture circular; peristome expanded. C. ele- 
gans, Fer. 85 sp. Mostly Cuba and Jamaica. 
MycHosToMA, Albers, 1850. (Brachypus, Guild, 1828. Brachy- 
podella, Beck, 1837. Brachypodisca, Agass., 1847.) Shell sub- 
cylindrical or subulate, truncate; whorls 9-17, the last free, 
declining ; aperture subquadrangular; peristome expanded. C. 
collaris, Fer. (xcix,51). 27 sp. West Indies. 
sTROPHINA, Morch, 1852. Shell turriculated, cylindrical, sub- 
ventricose, umbilicated, summit truncate; whorls convex, ob- 
liquely plicate; columella angulated at the base; subarcuated ; 
aperture subquadrangular. C. Laterradii, Grat. (xcix, 52). 
Hayti. 
cIRROBASIS, Conrad, 1874. C. venusta, Conr. (xcix, 53). Ter- 
tiary. Pebas, Upper Amazon. 
TRACHELIA, Pfeiffer, 1855. (Acera, Ads. [ pt.], 1855.) Shell fusi- 
form, not rimate, apex attenuate, somewhat truncated; whorls 
18-24, the last free, protracted ; aperture oblique, circular ; peris- 
tome expanded. C. porrecta, Gould (xcix, 50). 33 sp. Cuba, 
and other W. I. Islands, Central America. 
METASTOMA, Strebel and Pfeffer. Not truncated; last whorls 
partly free, turned horizontally inwards, concealing the perfora- 
tion. C. Remeri, Pfr. Mexico. 
BOSTRICHOCENTRUM, Strebel and Pfeffer. Columella tubular, 
surrounded by a thick, solid, rope-like thickening. C. Tryoni, 
Pir, (xcix, 54)... Mexico. 
HOLOsPIRA, Martens, 1860. (Acera, Albers, 1850.) Shell 
rimate, turreted or fusiform, apex conical, not truncated ; whorls 
11-14, the last barely or not at all protracted, base carinated ; 
columella plicate; aperture quadrangular; peristome free, ex- 
panded. Erected by Crosse and Fischer into a distinct genus 
in the family Pupide, the teeth of the radula being in trans- 
verse rows and tricuspidate, similar to Helix ; the jaw very thin 
aud smooth. C. Pfeifferi, Menke ; Texas, Mexico. 13 sp. Mexico, 
Texas, on Cactus. 
