442 Canadian Record of Science. 
of the French Neocomian. The exact characters of the 
sutural line are unfortunately not well shown in either of 
these specimens. The two species represented may be pro- 
visionally described as follows, with the proviso that the 
diagnoses of each are, of course, subject to such modifi- 
cations or amplifications as may be made necessary by the 
discovery of more perfect specimens. 
OLcOSTEPHANUS (AsTIERIA) DEANsII. (Sp. nov.) 
Plate VI, figs. 1 and 1 a. 
Shell small, compressed at the sides and narrowly rounded 
at the periphery: umbilicus occupying rather less than one- 
third of the entire diameter. Volutions three or four, in- 
creasing rapidly in size, especially in the dorso-lateral direc- 
tion, and rather closely embracing, about two-thirds of the 
sides of the inner ones being covered, the outer one a little 
higher than broad: aperture elliptical in outline but deeply 
emarginate by the encroachment of the preceding volution. 
Surface marked by numerous, closely arranged, small 
but distinct, though not very prominent, flexuous, trans- 
verse ribs, which bifurcate about the middle of the sides and 
then pass uninterruptedly over the periphery. 
The sutural lines are so crowded together and confused 
that, although fairly well preserved in places, it is scarcely 
possible to follow the details of any single one. The 
siphonal saddle, however, is small, a little higher than 
broad, with a minutely trifurcate apex, and an appressed 
spur on each side below. ‘The first lateral saddle is large, 
ramose and unequally bipartite or obscurely tripartite at 
its summit. The siphonal lobe is large and symmetrical, 
with three branchlets on each side, two of which are lateral 
and one terminal, but the lowest of the two pairs of lateral 
_ branchlets is much the smailest of the three pairs. 
The only specimen collected is considerably eroded near 
the aperture, as represented in fig. 1, but in the uneroded 
portion the maximum diameter is about forty millimetres, 
and the greatest breadth fourteen. 
