105 
S P I R I F E R am hi gnus. 
TAB. CCCLXXVI. 
Spec. Char. Subpentangular, gibbose, smooth, 
with the middle elevated towards the front; 
beak produced, perforated ; hinge line very 
short. 
The produced beak and three-sided front give this shell 
a five-angled contour, although the sides are rounded. 
In general appearance it does not agree with most of the 
species of the Genus Spirifer, but approaches nearer to 
the smooth Terebratulae ; its having a perforated beak, 
and little or no hinge line, still further distinguish it ; 
but the actual existence of spiral appendages seems to 
confirm it a Spirifer, unless its combining the characters 
of both Genera should render it adviseable to construct 
a new Genus of it. But as the appendages within the 
Terebratulas are very variable, it will be well to wait un- 
til more of them are known. 
Obtained from decomposed Mountain Limestone, 
(Rotten-stone) found near Bakewell, and kindly pre- 
sented to me some years ago, by Mr. White Watson. 
The shell is replaced by Silex, which has retained the 
form of it, although the stone is completely decomposed 
and reduced to a brown powder ; the spiral appendages 
are extremely fragile. 
SPIRIFER minimus. 
TAB. CCCLXXYIL —Fig. 1. 
Spec. Char. Transversely oblong, gibbose, 
with 15 longitudinal ridges, the three central 
ones elevated. 
R ather rhomboidal with rounded angles, the ridges are 
rounded, close together, and smooth ; the three elevated 
ones are less distinct from each other than the others ; 
the long line of the hinge, the flat space, and triangular 
foramen between the pointed beaks are very conspicuous, 
but the appendages characteristic of the Genus Spirifer, 
