322 
ADDITIONS TO THE GENUS STREPTAXIS. 
By G. K. Gunz, F.Z.S., ete. 
Read 3rd April, 1903. 
PLATE XII. 
Smvce my synopsis of the genus Séreptaris appeared! additional 
material has reached me from various sources. Amongst it are some 
apparently new species, descriptions of which are now given. I am 
enabled also to illustrate two hitherto unfigured species and to 
supply a few bibliographical items which were omitted from the 
former paper. 
1. Srrepraxts Da-Costm, n.sp. Pl. XII, Figs. 5-7. 
Shell imperforate, solid, whitish corneous, subpellucid, conoid, 
strongly ribbed above, the interstices showing microscopic spiral 
striation, smooth and polished below; slightly excavated round the 
umbilicus. Spire convex, suture impressed, apex obtuse. Whorls 62, 
rapidly increasing, somewhat flattened at the sides, tumid below, the 
last dilated towards the aperture, shortly and slowly descending in 
front. Aperture oblique, semi ovate, the margins subparallel. Peri- 
stome thickened and shortly reflected ; outer margin slightly receding 
above, columellar margin ascending, dilated, completely closing the 
umbilicus. <A thin callus covering the parietal wall, which shows two 
or three varices. Alt. 14 mm.; diam. maj. 15, min. 13°5 mm. 
Hab.—Cauca, New Grenada. Four specimens. 
Type in Mr. Da Costa’s collection. 
The new species resembles S. /uncki, Pfr., but is much smaller, 
the axis is more oblique, the columellar margin more ascending, the 
aperture narrower, and the spire more elevated. Two of the specimens 
are immature, showing the deep open umbilicus. 
2. Srrepraxis Tuesawi, Godwin-Austen. Pl. XII, Figs. 11-13. 
This species has hitherto not been illustrated. Mr. Ponsonby, who 
possesses the type, has kindly allowed me to give a figure of it. 
3. Srrepraxis porrectus, Pfeiffer. Pl. XII, Figs. 20-22. 
This species also has remained unfigured. The shell drawn has 
been compared with the types in the British Museum, and it agrees 
with them in every respect, except that it is a trifle smaller. This 
specimen and one other were received from Mr. Hermann Rolle, with 
the habitat Laos. Alt. 7°75, diam. 6 mm. 
4. Srrepraxis Prestoni, n.sp. Pl. XII, Figs. 17-19. 
Shell narrowly deeply umbilicated, subcylindrical, whitish corneous, 
smooth and shining, finely costulate at the sides, the costula becoming 
1 Ante, p. 201. 
