DESCRIPTION OF SHELLS. 179 
Swainson), Ampullina, Deshayes, and Natica, Lamarck, are distinguished by the 
following marks ; in the general form they are all nearly alike. The lower part 
of the left lip in Globulus is sharp and not reflected, and the umbilicus, whether 
open or covered, has no ridge rising in it. In Ampullina the lower part of the left 
lip is slightly reflected, and a sharp ridge ascends from it up the outer side of 
the umbilicus. In Natica the lower portion of the aperture is like that part in 
Globulus, but the left lip is thickened and forms a callus, from the base of which 
a ridge ascends the umbilicus on the side nearest the aperture. These characters 
are suflicient for fossils, but of course nothing can be said about the animals of 
the first two genera, as they are not known recent. 
Delphinula Warnw. (Tab. VII. fig. 23.) 
One of the most beautiful and at the same time most interesting shells of the 
Bracklesham beds, as indicating very precisely the corresponding French 
formation. 
Solarium spectabile. (Tab. VI. fig. 2.) 
Spec. Cuar.—Convex, striated ; margin thin, sharp, deflected ; whorls about 
six, slightly convex ; their upper edges prominent, crenated ; the spaces between 
the striz unequal, alternately granular ; umbilicus nearly equal in its diameter 
to half that of the shell, with a crenulated margin ; aperture rhomboidal. 
Height about half the diameter of the base. 
Covered within the umbilicus, as well as over the other parts, with alternately 
linear and granulated ridges, which are largest towards the upper edges of the 
whorls and the margin of the umbilicus. 
Solarium pulchrum. (Tab. VI. fig. 3°.) 
Spec. Cuar.—Very short, conical, striated ; margin thin, sharp, projecting ; 
whorls about five, convex above and below; the spaces between the striz 
unequal, granulated ; umbilicus nearly half the diameter of the base, with a 
square margin. 
Height one-third the diameter. 
Similar to the last, but more depressed and even, and without any hollow to 
distinguish the whorls. 
