106 Trans. Acad. Sci. of St. Louis. 



GASTEROPODA. 



LOXONEMA SHUMARDANA (Will.). 



PI. VII. f. 5. 



Murchisonia shumardana. Bull. U. S. G. S. No. 153: 359. 



" Shell small, conical, consisting of six or seven gradually 

 enlarging whorls, somewhat flattened on the base and outer 

 surface, so as to leave but a shallow suture; body whorl 

 obtusely angulated at the junction of the basal and lateral 

 surfaces; aperture broadly cuneate-ovate, angulated behind, 

 scarcely effuse in front; plane of aperture parallel with 

 vertical axis of shell, surface of cast quite smooth. Height 

 of shell, 14 mm.; height of last whorl, 6 mm.; diameter of 

 base of shell, 7 mm. ; length of aperture, 5+ mm. ; greatest 

 width, 4 mm.; apical angle, 34°." 



Remarks. The specimen here illustrated is the type of this 

 species, and is the only specimen which has been observed. 

 The generic characters of the shell are uncertain, but it 

 certainly is not Murchisonia, the genus to which it was 

 originally referred. It is here placed in the genus Loxonema 

 but not without some doubt. It resembles some of the species 

 referred by DeKoninck to the genus Flemingia,* and it is 

 possibly a member of that genus. 



Loxonema oligospira Win. 



PL VII. f. 4. 



"Shell small; whorls about six, rather rapidly enlarging, 

 convex exteriorly, with traces (on the cast) of vertical ridges, 

 which become more observable in the vicinity of the aperture ; 

 suture deep; body whorl three-fifths the length of the shell, 

 more rapidly enlarging than the spire, gently convex on the 

 outer side, more rapidly curved toward the base — which is 

 somewhat umbilicately indented — rapidly increasing in 

 diameter toward the aperture, which is thus rendered some- 

 what effuse in front. Height of shell, 10 mm. ; height of 

 body whorl, 5^ mm. ; diameter of body whorl, 7 mm." 



Remarks. This species was founded upon a single speci- 



* See F. Munsteri DeK., Faun, du Calc. Carb. de la Belg. 3. pi. 7. f. 21-22. 



