ANTILLEAN LEPTINARIA. 295 



pressed suture, the last whorl well rounded, very convex bas- 

 ally. Aperture hardly oblique, ovate, the outer lip a trifle 

 arched forwardly above. Columella very short, vertical, 

 deeply truncate obliquely at base. 



Length 4.9, diam. 2.3, aperture 2.2 mm. 



Length 5.5, diam. 2.7, aperture 2.4 mm. 



Figs. 44, 46, 47 are from examples in C. B. Adams' collec- 

 tion, one measuring 5 x 2.7, aperture 2.4 mm., with 5% 

 whorls; the other 6.2 mm. long. Some other individuals in 

 coll. A. N. S. without exact locality are larger, length 6.2, 

 diam. 3, aperture 3 mm., with nearly 6 whorls. 



There is a distinctly perforate or narrowly umbilicate form 

 of L. pallida. A well-grown specimen in the Adams collec- 

 tion, pi. 43, fig. 43, measures, length 7, diam. 3.3, aperture 3 

 mm., with 6% whorls. It is narrowly umbilicate, turrite- 

 ovate, whitish-eorneous with straightly conic spire. The sur- 

 face is striatulate, the striae very fine, but rather sharp and 

 arcuate below the suture. Aperture somewhat oblique. Colu- 

 mella dilated, only obscurely truncate. The outer lip is 

 slightly arched forward above. The sides of the spire diverge 

 at an angle of 34 degrees in the example figured. 



This form is similar to typical monodon in structure of the 

 axis, while typical pallida resembles the so-called "variety" 

 opalescens. 



HAITIAN FORM (pi. 43, fig. 51). At Cape Haitian two 

 specimens were taken by Mr. Henderson of a Leptinaria not 

 distinguishable from the Jamaican L. pallida. One is imper- 

 f orate and only half-grown. The other, fig. 51, is quite openly 

 umbilicate and measures, length 6, diam. 3, aperture 3 mm., 

 whorls 6y. Another imperforate specimen was found at 

 Port au Prince. 



4. L. PALUDINOIDES (Orbigny). PI. 40, figs. 18, 19. 



Shell oval, conic, thin, diaphanous, smooth. Spire conic, a 

 little obtuse at the summit, composed of 5 very swollen whorls 

 separated by a deep suture, the last whorl occupying less than 

 half the total length. Aperture oval; columella acute, pro- 

 jecting, twisted, and truncate at the end. Color uniform 

 white. Length 3, diam. 1.5 mm. (Orb.). 



