'216 LAND AND FRESH- WATEE SHELLS OF N. A. [PART L 



lated fillets and oblique swatbs ; whirls 6-8, the last inflated ; 

 columella filiform, loosely ar.cuated-intorted, obliquely subtrun- 

 -cated at base, aperture oval, peristome straight, its margins 

 connected by a light callus. 



Animal heliciform, large, scarcely included in the shell, ovipa- 



Flg. 369. 



Animal of Orthalicus undatus. 



reus; eggs moderate, oblong-subrotund, with a granulately- 

 roughened, thick, calcareous covering. 



Orthalicus zebra. Mull. — Shell ovate, conic, imperforate, rather 

 thill, surface shining, smooth, scarcely broken by the very delicate incre- 

 mental striae ; cream-colored, on the body- 

 Fig. 370. whirl darker; ornamented upon the body- 

 whirl with three brownish narrow bands, the 

 upper one very delicate, half way between 

 the suture and the upper extremity of the 

 peristome, the central one narrower, but very 

 much darker, commencing at the upper ex- 

 tremity of the peristome, the third broader 

 than the first, very dark, lighter at the edges, 

 commencing at the centre of the parietal wall 

 of the aperture ; but one central, narrow, light 

 band upon the upper whirls, two oblique bands 

 marking the earlier peristomes ; spire conic, 

 apex pointed with dark brown ; whirls six, 

 convex, the last ventricose, three times as 

 long as the spire ; columella thickened with 

 white callus, rather straight ; aperture oblique, 

 oval, within white, showing the bauds ; peri- 

 stome thin, acute, broadly margined with 

 black both without and within, its extremities joined with a shining. 



Orthalicus zebra. 



