98 
HIND : NEW CARBONIFEROUS NAUTILOIDS. 
time to publish descriptions and figures of them and to revise any 
previous work germane to the subject. In three cases figures of 
a sort had been pubHshed, under generic and specific names, 
which denoted characters, widely different, from those which 
belonged to the specimens, all of which were unaccompanied by 
descriptions. Two specimens, each of a different genus, were 
referred to Nautilus cyclostomus , Phill., and the other specimen, 
though figured, was not described or allotted a specific name. 
One specimen has characters which separate it from all known 
genera. It has therefore been necessary in this case to erect a 
new genus for this species for which I propose the name Cyclo- 
nautilus. 
SOLENOCHEILUS GLOBOSUS, SP. NOV. 
(Plates III., figs. 1, 2 ; IV., fig. 1). 
Nautilus cyclostomus, pars, Wild, 1892, Trans. Manch. Geol. 
Soc, Vol. xxi., p. 379, PI. 1, fig. 1. 
Specific characters. — Shell large, globose, involute, expanding 
rapidly, inner whorls almost entirely concealed by the outer. 
The umbilicus is small and infundibuliform ; its outer margin, 
in the older portion of the shell, angular and produced. The 
greatest thickness of each whorl is at the upper umbilical margin. 
Whorls about two and a half, inclusion large. Peripheral border 
of whorl almost semi-circular. The periphery broad, strongly 
convex, the septa are numerous, 19 are exposed in the last whorl, 
they become somewhat closer together as they approach the 
body chamber, and the chambers therefore shallower ; sutures 
simple, with a very gentle concave curve in the middle third of 
the peripheral area. The body chamber is large and expanded 
from side to side, but flattened from above doAvnwards. The 
umbilical margin strongly ridged and apparently produced. A 
well-marked, broad, hjrponomic sinus existed. 
Siphuncle is very small and placed centrally and immediately 
beneath the peripheral border. 
Test. — Moderately thick, of several layers, ornamented by 
many close fine striae, arranged parallel to the margin of the 
aperture and showing the well marked hyponomic sinus 
