SYNAPTERPES. 231 



4. S. INCERTUS (Mousson). PI. 37, figs. 92, 93, 94. 



Shell imperforate, long subturrite, rather thin, reticulated 

 with close, rather rough, striae and spiral lines interrupting 

 them; silky; wood-brown, with transverse lines and more 

 spaced descending ones. Spire long conic, the summit large 

 and very obtuse; suture a little impressed, subcrenulate. 

 Whorls . 7, plano-convex, the first elegantly rib-striate, the 

 last not ascending, three-eighths the total length, long-ovate, 

 rounded at the base. Aperture sub vertical, (25 degrees with 

 the axis), narrowly oval, angular above, wider at the base, 

 effuse, pale within. Peristome unexpended, acute, the right 

 margin long-arcuate, basal margin receding; columellar mar- 

 gin thin, wholly appressed. Columella long, somewhat 

 twisted, a little thickened below, obliquely sub truncate. 

 Length 40, diam. 16 mm. (Mouss.). 



Colombia: Bogota (Wallis). 



Spiraxis incerta Mouss., Malak. Bl. xxi, 1873, p. 14. 

 PFR., Monogr. viii, p. 256; Novit. Conch, p. 147, pi. 133, 

 f. 12, 13. 



The surface is closely and rather deeply striate, the striae 

 being cut by spirals into series of short curves, somewhat 

 festoon-like. The surface is pale yellowish-brown, with nu- 

 merous brown spiral lines, many of them indistinct, and with 

 narrow vertical streaks of the same color. The summit, as 

 Mousson remarks, is very large, rounded, and arcuately ir- 

 regularly rib-striate, and there is an apical dimple as in 

 8. hanleyi. The columella reminds one of that of 8. hanleyi; 

 its edge is narrowly reflexed and adnate. A specimen with 

 fii/2 whorls, probably not quite adult, measures length 34, 

 diam. 14.5, aperture 17 mm. Figures 92, 93 are copies of 

 the type figures ; fig. 94 represents the enlarged apex of a 

 specimen before me. 



Subgenus CHRYSERPES Pilsbry, 1906. 



Shell glassy, greenish or golden, subtranslucent with 

 weakly crenulate suture and smooth apex, the columella with 

 a spiral fold below; axis perforate. Type 8. amabilis. 



