124 VARICELLA, CARIBBEAN. 



a 1 . Length of shell not much over 3 times that of aper- 

 ture; greenish corneous usually with continuous 

 chestnut stripes ; 14 x 4.3 mm., whorls 7, Guadeloupe. 



V. guadeloupensis, no. 73. 



a 2 . Aperture more than one-third the length of shell; 

 'corneous or yellowish with chestnut streaks cut by 

 peripheral and subperipheral pale belts; 27 x 9 mm., 

 with 71/2 whorls; Porto Rico. 



V. interrupta, no. 74. 



II. Embryonic shell forming an obtusely conic apex ; corneous 

 or yellow with some chestnut streaks; length 23 to 33, 

 diam. about 12 mm., with 7 to 8% whorls; Porto Rico. 



V. glabra, no. 75. 



71. V. SEMITARUM ('Rang' Pfr.). PL 5, figs. 7, 8. 



Shell subulate, the apex obtuse, pale 'corneous, longitudin- 

 ally substriate, glossy ; whorls 10, nearly flat, the last scarcely 

 exceeding one-fourth the total length. Columella strongly 

 arcuate, obliquely truncate at the base of the aperture. Aper- 

 ture oblong-acuminate, wide at the base; peristome simple, 

 the right margin somewhat arched forward. Length 28, 

 diam. 6.5, aperture 7x4 mm. (Pfr.). 



Martinique: Slopes of Mont Pelee (Beau); Massif des 

 Pitons near Gamp Balata, 500-610 meters elevation (Maze). 



Helix semitarum Rang in Paris Museum. Achatina semi- 

 tarum Rang PFR., Symbolae ii, p. 59 (1842) ; Monogr. ii, p. 

 263. Conchyl. Cab. p. 333, pi. 28, f. 10, 11. REEVE, Conch. 

 Icon, v, pi. 16, f. 73. FISCHER, Journ. de Conchyl. vii, 1858, 

 p. 185, pi. 7, f. 4, 5. Glandina semitarum MAZE, Journ. de 

 Conchyl. 1874, p. 159. BINNEY, Ann. N. Y. Acad. Sci. iii, 

 p. 81, pi. 17, f. (teeth) . Achatina sylvatica PFR., Monogr. 

 ii, p. 262, exclusive of references. 



The shell has a greenish-corneous tint and an oily or 

 varnish-like gloss. Very faint traces of fine spiral striae 

 may be seen under the lens, and there are occasional im- 

 pressed lines or varix-grooves marking former resting posi- 

 tions. The first 31/2 whorls are smooth, without these varix- 

 grooves, but on the rest there are about three of them on a 



