OLEACINIDA. 13 
mantle, under the peristome of the shell. Predaceous, devouring 
small Helices, Vitrina and Clausilia. 
Shell small, external, perforate, depressed ; paucispiral, whorls 
rapidly increasing. 
RUFINA, Clessin. Shell umbilicated. D. rufa, Drap. 
PSEUDOLIBANIA, Stefani. Shell haliotiform, spire very short, 
narrowly rimate, columellar lip slightly reflected over the 
umbilical slit. D. Langz, Pfr. 
LIBANIA, Bourg. Umbilicus covered in the adult. D. Saulcy?, 
Bourg. 
ISSELIA, Bourguignat. Shell perforated. Animal with caudal 
mucous pore. WD. (Helicarion) Sardous, Issel. 
CHLAMyDoPHORUS, Binney, 1879. 
Distr.—C. Gibbonsi, Binney (ci, 47). Natal. 
Mantle covering the whole body, with an orifice on the centre 
of the back near the tail, enclosing at the same part a solid 
internal shelly plate ; no caudal mucous pore; no jaw; teeth as 
in Glandina. Position of the genital orifice unknown. 
PLEcTROPHORUS, Fer., 1819. 
Distr.—5 sp. Teneriffe. P. Orbignyt, Fer. (ci, 48). 
Animal elongated, subcylindrical, with a tough dorsal anterior 
integument or mantle, under which is the pulmonary cavity, 
having its orifice on the right side, with the anal orifice near it; 
there is a second long and narrow posterior mantle, and an 
external rudimentary conical, non-spiral shell near the posterior 
extremity ; upper tentacles longest, oculiferous, retractile. 
This animal has not been recognized; the doubly armored 
back and conical external shell are both improbable characters. 
SELENOCHLAMYS, Bottger, 1883. 
Distr.—S. pallida, Bottg. Caucasus. 
Animal resembling Daudebardia, but without a shell; mantle 
small, the surface divided by longitudinal sulcations ; tail short, 
compressed, carinated ; foot narrow, tripartite. 
Famity OLEACINID A. 
Shell fusiform, corneous, more or less transparent, rarely 
banded longitudinally ; aperture longitudinal, narrow ; columella 
twisted or truncated at its base. Lingual teeth numerous, in 
more or less curved, transverse rows, the central teeth inconspic- 
uous, the marginal aculeate, or with a single, long, recurved 
apex (xiii, 56 A T6y Head short, with a retractile, "often produced, 
buccal sac; eyes at the tips of elongated, cylindrical, retractile 
peduncles ;_ inferior tentacles moderate, situated below the eye- 
peduncles ; foot elongate, narrow, simple posteriorly. 
Living in humid situations ; carnivorous. 
