HELICTNA §. 8. 
375 
altior quam lata; columella brevis, basi tuberculata, retrorsum 
in callum basalem diffusum, concolorem, antrorsum in peri- 
stoma crassum, reflexum, interdum duplicatum continuata. — 
Operc. ? — Diam. maj. 8, min. 7, alt. 6 a / 3 mill. (Coll. Nr. 54.) 
Hclicina tropica Jan mss. 
— -k Chemn. ed. II. N. 44. p. 37. t. 4. f. 9. 10. 
/?. Flavida, vel rubella, interdum subfasciata: 
Helicina Ambeliana Sow. Thes. t. 1. f. 19. 
— tropica var. Chemn. 1. c. t. 8. f. 22. 
Habitat in Texas. 
O b s. Ex icone Sayana hanc speciem sequenti identicam suspicor. 
80. M. orbiculata Say. f 643 
T. subglobosa, spira non prominente, linea laterali con- 
vexa; anfr. 5 transverse obsolete striati, regulariter rotundati; 
pallide virens, flavicans vel rubro tincta, superne obsolete 
albo-lineata; apertura superne acuta, inferne rotunda; basis 
columellae obtuse angulata; labrum album, reflexum. ■ — Long. 
V 5 poll. (Say.) 
Oligyra orbiculata Say in Phil ad journ. I. p. 283. *) 
— — Say Amer. Conch, t. 46. f. 1 — 3. Ed. Chenu (Bibl- 
conch. III.) p. 56. t. 15. f. 2. 2a. 2e. 
Helicina orbiculata Blainv . in Diet. sc. nat. XX. p. 456. 
— — Gray in Zool. Journ. I. p. 70. 
Habitat in Florida orientali (Say). 
Obs. H. orbiculata Sow. (Thes. N. 65.) nullo modo hue pertinet, 
sed H. nitidae Pfr. potius proxime affinis videtur, nisi eadem est. 
81. H. Iffa is Bey ana Pfr. 644 
T. globoso-conica, solidula, lineis concentricis, impressis, 
subdistantibus sculpta, vix diaphana, nitida, fulvo - carnea ; 
spira breviter conoidea, obtusiuscula ; anfr. 5 vix convexius- 
*) Shell subglobular, spire not prominent, but more than convex, 
lateral line somewhat convex ; whorls five, obsoletely striated across, regularly 
rounded ; colour pale greenish , yellowish or slightly tinted with reddish, 
particularly on the body, and margined above by an obsolete white line, 
on the middle of the body a white vitta revolves , sometimes obscure or 
wanting, aperture acute above, regularly rounded at the base, and extending 
from the centre of the revolutions or base of the column, to an equidistance 
between the base and apex of the spire, base of the columella slightly 
projecting into an obtuse angle, exterior lip whitish, reflected. Operculum 
simple, not spiral, yellowish brown, minutely granulated. (Say 1. c.) 
