264 EULIMID^. 



Genus LOXOXEMA, Phillips, 1841. 



Shell elongated, many-whorled ; aperture simple, attenuated 

 above, effused below, with a sigmoidal edge to the outer lip ; 

 spire interiorly septate. 



Like many other palaeozoic genera, the bad condition of man}- 

 of the species and the variation in form and sculpture render it 

 difficult to place it properly in a systematic work; some of the 

 species might go into Turbonillidse, others appear closel}' allied 

 to Chemnitzia^ and might even be s3-nonymous with it. Michelia^ 

 Romer, and Holoj^ella, Sandberger (in part), are S3-nonyms. 

 L. COSTATUM, Sandb, (Struct, and Syst. Conch., t, 68, f 97). 



Genus STROBEUS, de Koninck, 1881. 

 Shell small, smooth, spire sharp, of 5-7 convex Avhorls ; mouth 

 long-oval, outer lip sharp, inner lip callous, with an anterior fold. 

 Dist. 3 sp. Carboniferous, Belgium. 



Genus ORTHOXEMA, Meek and Worthen, 1861. 



Shell elongate, mauj^-whorled, with revolving carinas, crossed 

 by nearly straight growth-lines ; aperture angular above, slightly 

 effuse below, lip simple, nearly straight; axis imperforate. 



Devonian and Carboniferous, United States. 



Allied to Loxonema, but has distinct revolving carinte, and 

 wants the sigmoid outer lip of that genus. 



Genus RIGAUXIA, Cossmann, 1885. 

 Shell narrowly elongated, nearly C3lindrical, spirally striate; 

 aperture rounded in front, lip a little sinuous above, inner lip 

 thickened behind and separated from the columella in front by 

 a groove. Fossil, Bathonian. 



Genus CLIMACIXA, Gemmellaro, 1878. 

 Shell imperforate, man\--whorled, elongated, very finely longi- 

 tudinally striated ; aperture oval, rounded in front, lip simple. 

 C. CATHERiN-a;, Gemm. Lias. 



Genus SUBULITES, Conrad, 1842. 

 Shell fusiform, spire produced ; volutions convex, the last 

 laro^e ; columella bent and truncated at the base, where it is 

 separated from the outer lip bj' a notch as in Achatina ; outer 



