160 PLEUROTOMIDZ. 
It is retained as a genus to prevent the duplication of specific 
names. 
Ditoma and Atoma, Bellardi, are groups found in the Italian 
tertiary which may be here referred. 
Genus DAPHNELLA, Hinds, 1844. 
Shell thin, fragile, oval-fusiform; whorls convex ; body-whorl 
elongated, surface finely cancellated ; aperture oval; lip simple, 
not varicose, arcuated ; canal very short. Warm Seas. 
Small and elegant shells, of slight texture, distinguished by 
their elongated body-whorl, tenuity and sculpture. 
The following may be considered sections of Daphnella :— 
Section Rapuitoma, Bellardi, 1847. Shell small, fusiform, or 
turriculated, with longitudinal sculpture; lip sinuous behind, 
but without well-defined sinus. There are a number of tertiary 
species. 
Section Homotoma, Bellardi, 1875. Whorls canaliculated at 
the suture. Tertiary only. 
Section TEREs, Bucq., Dautz. and Dollf., 1882. Shell fusiform ; 
spire long; sinus profound; columella straight, obliquely trun- 
cate at the base. 
Section BELLARDIELLA, Fischer, 1883 (Bellardia, Bucq., Dautz. 
and Dollf., 1882, non Mayer, 1870). Form lanceolate, similar to 
that of the true Pleurotomas; sinus sutural; canal rather long. 
Section Zarra, A. Adams, 1872. Shell acuminately oval, 
tumid in the middle; whorls longitudinally plicate, the last 
constricted at the base; aperture linear; inner lip effuse, its 
margin free; outer lip acute, subsinuous behind, subinflected in 
the middle. 
Seminella, Pease, which has by some been considered identical 
with Zafra, appears to me to be Columbelloid, and I have so 
treated it in vol. v of this work. 
Section TuessiA, Jeffreys, 1867. Shell thin, rather smooth, 
somewhat tumid, with a short spire and irregularly contorted 
apex ; aperture slightly expanded, the outer lip thin, with distinct 
sinus ; canal short ; columella simple. 
Section Taranis, Jeffreys, 1870. Shell minute, cancellated, 
whorls angulated ; slightly exserted at base ; aperture pyriform; 
outer lip thin, simple ; sinus obsolete ; canal short. 
