222 SUBULINA. 



. Shell slender, the columellar margin but 

 slightly concave; 21 to 25 mm. long, 4.5 to 

 5 wide, with 9y 2 whorls. Mexico. 



S. porrecta, no. 5. 



aa. Surface very densely, finely striate; aperture as in 

 8. octona ; 9 x 3 mm. with 6% whorls. Para. 



8. parana, no. 4. 



aaa. Surface with distant, inconspicuous riblets ; 8 x 2 

 mm. with 11 whorls. Guatemala. 



8. cylindrella, no. 6. 



II. Embryonic whorls with large protuberances, the rest 

 sculptured with delicate, close vertical riblets. Guatemala. 



8. stolli, no. 7. 



1. S. OCTONA (Bruguiere). PL 39, figs. 28 to 37, 39, 40. 



Shell imperf orate, thin, translucent, yellowish-corneus, tur- 

 rite, regularly tapering to the obtuse summit, very glossy, ir- 

 regularly wrinkle-striate. Whorls 9 to 11, quite convex, 

 parted by a deep and in places irregularly crenulate suture, 

 the first 2% or 3 whorls regularly crenulated by a series of 

 short, fine subsutural folds. Aperture small, ovate, somewhat 

 oblique; outer lip thin; columella concave above, obliquely 

 and deeply truncate at its base. 



Length 21.5, diam. 5, aperture 4.7 mm., whorls 10 

 (S. Domingo). 



Length 22.9, diam. 5, aperture 4.3 mm., whorls 11 

 (S. Domingo). 



Length 20, diam. 4.4, aperture 4 mm., whorls 9% 

 (S. Souci). 



Length 21, diam. 4.2, aperture 4 mm., whorls 10 

 (Tabasco). 



Tropical America. I have examined specimens from the 

 following localities: Antilles: Bermuda; Nassau N. P., Ba- 

 hamas; Havana, Matanzas and Cienfuegos, Cuba; Port An- 

 tonio, Blackstone R. and Porus, Jamaica; Jeremie, Char- 

 mattes, Cape Hatian, Sans Souci and S. Domingo City, Haiti ; 

 Porto Rico ; Vieques, St. Thomas, St. John, Antigua, Tortola, 

 St. Bartholomew, Guadeloupe, Dominica, Barbados. South 



