EULIMID^. 233 



Distr. — 3 sp. Carb. ; Indiana. B. bulimifoi'mis, Hall. 



Shell fusiform, spire produced ; volutions convex, the last 

 large ; columella bent and truncated at the base, where it is 

 separated from the outer lip by a notch, as in the recent genus 

 Achatina ; outer lip very slightly notched near the upper end ; 

 surface of the shell smooth. 



Chemnitzia, d'Orb., 1850. 



Etym. — In honor of Chemnitz, a distinguished Nuremburg 

 conchologist, who published seven volumes in continuation of 

 Martini's""Conchylien Cabinet," 1780-1195. 



Distr. — Fossil only, 250 sp. World-wide. Triassic — . G. 

 condensata^ Desh. Ixviii, 96). 



Shell comparatively large, elongate-conical ; spire man}'- 

 whorled, not reversed at the apex ; last whorl moderately'' large, 

 somewhat produced below ; aperture ovate, sometimes faintly 

 efiuse at base ; peritreme not continuous ; outer lip sharp, with 

 usuall}^ a faintly sinuous outline near or above the middle ; col- 

 umella smooth ; imperforate ; surface with longitudinal costee 

 or lines, sometimes crossed b}'^ revolving striae — rarely nodular. 



I restrict Chemnitzia to the fossil group so known, and which 

 appears to have been most nearly related to the Bulimidse. The 

 much smaller sized ribbed recent species which have been referred 

 to this genus, and which d'Orbigny actually included in his earliest 

 definition of it, are distinguished under the name of Turbonilla, 

 Risso. They do not possess the broad posterior insinuation of 

 the outer lip characteristic of Chemnitzia. 



CHEMNITZIA (restricted). Shell lengthened with cross-ribs; 

 mouth oval, rounded or angular in front ; spire straight or slightly 

 curved, somewhat callous; outer lip sharp. Gh. similis, Miinst. 



RHABDOCONCHA, Gcmmellaro, 1878. Whorls striate or ribbed 

 longit\idinally, which are sometimes punctate or tuberculate. 

 G. crassilabrata, Terq. 



PSEUDOMELANIA (Pictct), Gremmellaro, 1878. Shell long, thick ; 

 whorls smooth, with fine curved growth-lines ; mouth rounded 

 or angular in front ; spire straight or slightly curved. Gh. No?-- 

 mannia, d'Orb. 



OONIA, Gemmellaro, 1878. Shell egg-shaped, smooth, with 

 growth-lines ; last whorl large ; mouth oval, rounded in front ; 

 spire slightly curved. Gh. Gornelia, d'Orb. 



MicROSCHizA, Gemmellaro, 1878. Shell usually with cross- 

 ribs ; narrowl}'' perforated ; whorls sharp, mostly scalariform ; 

 mouth oval, rounded in front ; inner lip and spire callously 

 thickened. G. Fhilenor, d'Orb. 



LoxoNEMA, Phillips. 

 Etym. — Loxos, oblique, and nema, thread ; in allusion to the 

 striated surface of many species. 

 16 



