EASTKLiN PROVING K SOUTHERN REGION SPECIES. 425 



Subgenus OPEAS, Albers. 



Auinial not observed. 



Shell iniuutely perforated or rimate, thiu, striated, slightly or mod- 

 erately smooth ; whorls 6-8, rather convex, the last usually com- 

 ])ressed ; aperture ovate-oblong, equaling one-third to one fourth of 

 the shell's length; peristome simple, acute, its coluinellar margin re- 

 flected. Size moderate or small. 



East Indies, West Indies, Africa, South America. In our country it 

 has only been introduced into the Southern Eegion. 



Jaw and lingual dentition : see above, p. 423. 



Sfenofe'yra octoiioides, D'Orbigny. 



Shell small, elongated, turreted, transparent, with delicate, longitud- 

 inal striii:', sometimes of a spermaceti- white and sometimes ^^^ ^., 

 wax yellow ; whorls about 8, convexly rounded, revolving 

 more closely at apex than elsewhere, so as to form a some- 

 what obtuse summit, the lastwhorl less than one-third the 

 length of the shell ; suture deeply impressed ; columella nearly 

 straigiit; aperture elongated, narrow, rhomboid-elliptical; stenogyra 



. , octonoides. 



))eristome simple, its right margin straight, its columellar 



margin slightly reflexed, protecting a minute umbilical perforation. 



Ij(Migth of axis, IS'"""; diameter, about 3"". 



Hiiliniii'i octonoides, D'Orb., Moll. Cub., i, 177, tab. xi, figs. 23, 24; pi. xi, bis, tigs. 22- 



24. — Pfeiffer. 

 JSiilimiis siibuJa, Binney, Terr. Moll., ii, 285, pi. liii, fig. 4. — W. G. Binney, Terr. 



Moll., iv, 134.— Not of Adams. 

 Stciiofiiira octoiwidcs, W. G. Binney, Terr. Moll., v, 194. 



Found in the Florida Subregion, at Fort Dallas, Fla , and in several 

 of the West India Islands — Cuba, St. Thomas, Jamaica, Porto Rico. 

 It has also been found in Charleston, S. C. 



This species belongs to a somewhat numerous group found in the 

 troi)ics wherever the banana and other Musacea' flourish, some of 

 which have the columella truncated, and were formerly arranged under 

 the genus AchaUna, like *S'. octona^ though by their natural affinities 

 they are clearly associated. The banana and plantain have, by trans- 

 X)lantation, become naturalized throughout the tropics, and it is highly 

 probable that many shells found with them, which have received dif- 

 ferent names merely because they have been found in localities far re- 

 mote from each other, are really identical. This shell is considerably 



