236 GASTEROPODA OF THE INFERIOR OOLITE. 
smooth, subturbinate shells, often rather small, which have been hitherto regarded 
as Phasianellas? Their intimate connection with Bowrguetia striata has been 
admitted when both were classed under Phasianella. In fact, Fischer (Man. 
p- 812) says, ‘* La plupart des prétendus Phasianella des terrains Jurassiques sont 
des Bourguetia.” We might then rank these as a second section of Bourguetia, or 
we might make use of Gemmellaro’s subgenus Oonia, to help us out of our 
difficulty. Judging from Gemmellaro’s figures such shells as Oonia turgidula, Gemm., 
are scarcely to be differentiated from some of our Inferior Oolite “* Phasianellas.” 
Without in the least degree believing that this group has any connection with the 
Turbinide as the name, Phasianella, would imply, I have concluded to continue 
the use of “ Phasianella,’”’ simply as a term borrowed from existing conchology, 
whilst classifying with a query under Pseudomelanide. 
This family is represented in the Tertiaries by Bayania, Mun. Chalmas, in the 
Cretaceous and Jurassic by Pseudomelania, and in the Paleozoic by Loxvonema 
and Macrochilus. The latter seems to have had a slight fold on the columella. 
Genus—PsruDOMELANIA, Pietet and Campiche, 1862. 
Shell turrited, elongated (spire pointed), not wimbilicated, thick; ornaments 
usually confined to lines of growth ; aperture oval, entire, reqularly rounded in front, 
and terminating posteally in an angle; columella thick, and sharing in the general 
curvature of the mouth, always without folds. 
Abridged from ‘ Les fossiles du ‘Terrain Crétacé des environs de Ste. Croix.’ 
The authors further distinguished this genus from ‘* Chemnitzia” by the mouth 
being regularly rounded in front, and by the absence of transverse (i. e. axial) ribs ; 
from Hulima by the unpolished surface; from the Pyramidellide by the absence 
of columellar teeth; from Niso by the want of umbilicus. According to the 
authors the genus appeared in the Trias, attained its maximum in the Jurassic, 
and diminished in the Cretaceous, beyond which period it did not pass. 
Some slight modifications of the above diagnosis may be required. ‘Thus the 
earlier Pseudomelanias of our Oolitic rocks develop a tendency to nodose orna- 
ment, which they may have inherited from ancestors in the Lias, such as Melania 
nodosa, Desl. found in the Upper Lias of Fontaine Etonpe-Four. In one case 
also, as we shall perceive, there is a slight tendency to an anterior notch in 
the aperture. It may be doubted also whether the spire is much pointed in 
all cases. 
There is great variety of form in the Pseudomelaiizx of the Inferior Oolite ; 
yet, within certain limits, the group represented by Pseudomelania procera, Desl., 
