472 
dilated anteriorly; canal short. 
anteriorly, sometimes prolonged in 
the spire posteriorly by a callosity. 
Columellar border smooth, straight. 
Tertiary and Recent. 
Rostellaria, 
whorls smooth. 
anteriorly in a beak-like canal, and 







Fic. 946. 
Hippochrenes Murclisoni, Desh. 
Grossier ; Damery, near Epernay. 
outer lip often thickened, denticulated, or somewhat reflected outwardly. 
Cretaceous. 
Columbellaria, Rolle (Fig. 948). 
times cancellated. Aper- 
ture long and _ narrow, 
broadening somewhat 
anteriorly. Outer lip 
denticulated internally, 
not thickened, somewhat 
reflected. Anterior and pos- 
terior canals short. Upper 
Jura. 
Zitteia, Gemm. (Fig. 
949). Like the last, but aper- 
ture very narrow or cleft-like. 
Columbellina, VOrb. ; Cretaceous. 
Family 21. 
Shell ovate, convolute. 
very large body whorl. 
Caleaire 
MOLLUSCA SUB-KINGDOM yI 
Outer margin thin, simple, obliquely truncated 
A 
Lam. Spire high, 
Aperture produced 

continued posteriorly as a narrow 
channel resting on the 
spire. Outer margin 
with denticulate pro- 
cesses, notched anteriorly. Fic. 947. 
Late Tertiary and q,,Rimdl fate, any 
Recent. near Epernay. ; B, R. Barton. 
ensis, Sowb. sp. Calcaire 
Grossier ; Grignon. 
> t=) 
Hippochrenes, Montf. 
(Orthaulax, Cyclolomops, 
Gabb), (Fig. 946). Like the last, but outer 
margin expanded in wing-like fashion, and 
destitute of processes. Upper Cretaceous and 
Eocene. 
Rimella, Agassiz (Isoplewra, Meek), (Fig. 947). 
Surface cancellated. Outer lip with thickened 
margin, entire or crenulated. Upper Cretaceous 
to Recent. 
Family 20. Columbellariidae. Fischer. 
Shell thick, elongated oval, with short conical 
spire, and large, spirally ribbed, frequently can- 
cellated body whorl. Aperture narrow, anteriorly 
with short canal, and posteriorly with a canal 
directed obliquely outwards. Inner lip callous, 
Jura and 
Surface covered with numerous spiral ribs, some- 

Fic. 948, Fic. 949. Fie. 950. 
Columbellaria covral- Zittelia crassissima, Petersia costata, 
lina, Quenst. sp. Zitt. sp. Tithonian ; Gemm,. Tithonian ; 
Coral-Rag ; Nattheim. Stramberg. Palermo. 
Outer lip much thickened in the middle. Tithonian. 
Petersia, Gemm. (Fig. 950); Tithonian. 
Cypraeidae. Gray. 
Spire short, nearly or completely covered in the adult by the 
Aperture of equal length with the shell, narrow, anteriorly and 
