EULLMID^E. 265 



lip very slightly notched near the upper end ; surface of shell 

 smooth. Palaeozoic 4 , United States. 



Buhmella,of Hall (not Pfeiffer) ; 5aZw0rpfca,Whitfield,1882, 

 and Polyphemopsis, Portlock (in part), are synonyms. 



Genus FUSISPIRA, Hall, 1872. 



This Silurian group, which I have placed in Buccinidae, may 

 possibly belong here. 

 F. VENTRICOSA, Hall (Struct, and Syst. Conch., ii, 141 , t. 51, f. 50). 



Genus CHEMNITZIA, d'Orb., 1850. 



Shell comparatively large, elongate conical ; spire many- 

 whorled, the last rather large, somewhat produced below ; aper- 

 ture ovate, somewhat effuse at base, peristome not continuous, 

 outer lip sharp, sinuous at or above the middle, columella smooth, 

 imperforate ; surface longitudinally striate or costate, sometimes 

 decussated, rarely nodular. Secondary and Tertiary. C. CON- 

 DENSATA, Desh. (Struct, and Syst. Conch., ii, t. 68, f. 96). 



The recent shells known as Chemnitzia,and which were origi- 

 nally included by d'Orbigny in his diagnosis of 1839, are referred 

 to Turbonilla, Risso ; they are smaller, ribbed, and do not possess 

 the broad posterior lip-sinus of the fossil group. 



Section CHEMNITZIA (restricted). 



Shell lengthened, with cross ribs ; mouth oval, rounded or 

 angular in front; spire straight or slightly curved, somewhat 

 callous ; outer lip sharp. 

 Section RHABDOCONCHA, Gemellaro, 1878. 



Whorls striate or ribbed longitudinally, sometimes punctate 

 or tuberculate. 

 Section PSEUDOMELANIA, Pictet et Campiche, 1862. 



Shell elongated, thick; whorls smooth, with fine curved growth- 

 lines ; mouth rounded or angular in front ; spire straight or 

 slightly curved. 

 Section OONIA, Gemellaro, 1878. 



Shell egg-shaped, smooth, with growth-lines ; last whorl large ; 

 mouth oval, rounded in front; spire slightly curved. 



Section MICROSCHIZA, Gemellaro, 1878. 



Shell usually with cross ribs; narrowly perforate; whorls 



