214 PROCEEDINGS OF THE ACADEMY OF [DeC, 



whorls. First 2| whorls are smooth, following whorls sculptured 

 with axial (vertical) ribs less than half as wide as their intervals, 

 about 44 on the penultimate whorl. The upper ends of the ribs 

 project, crenulating the suture. Aperture ovate; columella a little 

 thickened, moderately sigmoid. 



Length 9.25, diam. 2.5, aperture 2.3 mm. 



Mountains west of Livingston, Guatemala (A. A. Hinkley). 



This species is related to S. stdciferus, but it has less crowded, 

 thinner ribs. 



Spiraxis longior n. sp. PI. XI, fig. 2. 



The shell is subulate, very slender, the diameter contained about 

 3.8 times in the length, composed of 9| moderately convex whorls, 

 of which the first 2^ are smooth; apex obtuse; subsequent whorls 

 sculptured with axial (vertical) ribs, which are just perceptibly 

 sinuous, almost straight, and nearly as wide as their intervals. There 

 are about 35 ribs on the penultimate whorl. On the last third of 

 the last whorl the ribs become a little weaker in fully adult shells. 

 Aperture ovate. Columella thin, weakly sinuous. 



Length 8, diam. 2.1, length of aperture 2 mm. 



Mountains west of Livingston, Guatemala (A. A. Hinkley). , 



A very slender form with small aperture, only one-fourth the 

 length of the shell. 



Pseudosubulina martensiana n. sp. PI. XI, fig. 3. 



The shell is slender, a little attenuated near the obtuse apex, 

 corneous-buff, composed of 9 whorls, the first three strongly con- 

 vex, the convexity diminishing subsequently, the later wiiorls being 

 flattened, convex only near the sutures. The initial f whorl pro- 

 jects and is smooth; the next two whorls are of about equal diam- 

 eter, with sculpture of widely spaced axial ribs; on subsequent 

 whorls the ribs are close, rounded, and as wide as their intervals, 

 40 standing on the penultimate whorl. On the last whorl the ribs 

 disappear on the base, which is smooth. Apertures rhombic; col- 

 umella moderately concave, deeply excised at the base. 



Length 11, diam. 3, length of aperture 3 mm. 



Mountains west of Livingston, Guatemala (A. A. Hinkley). 



In the related P. lirifera Morel, the columella is represented as 

 deeply concave, and there are more smooth whorls at the summit. 

 Whether the shell described and figured as P. lirifera by Professor 

 von Martens is really the species of Morelet is not quite certain. 



