XAUTILID^. 171 
close to the peripheral margin. The test appears to have been per- 
fectly smooth. 
Remarks. This species is well characterized by the angularity 
of the umbilical margin, which completely distinguishes it from 
S. dorsalis. 
Fig. 28. 
Solenocheiliis Hihernicus. — a, lateral view, sbow'ing the large cent i-al perforation, 
the angular margin of the umbilicus, and some of the septa ; b, front view. 
Drawn from a specimen in the Collection. Rather less than one half the 
natural size. 
Horizon. Carboniferous Limestone. 
Localities. Bolland, Yorkshire ; Ireland. 
AVell represented in the Collection. 
Solenocheilus latiseptatus, de Koninck, sp. 
1878. Nautilus latiseptatus, de Koninck, Faime du Calcaire Carboni- 
fere de la Belgique (Ann. dn Mus. Roy. d’Hist. Nat. de Belgique, 
tom. ii.), p. 110, pi. xxii. if. 1-3. 
Sp. Char. Shell suhglohose, very rapidly expanding, composed of 
two, or two and a half, whorls. The periphery broadly rounded 
and sloping rapidly down to the edge of the umbilicus. The um- 
bilicus is large, exposing all the volutions, ^vith a large central 
perforation. The septa are very wide apart, being about 10 lines 
distant, just below the body-chamber, the last two septa near the 
body-chamber being, however, only 7 lines apart. The siphuncle 
is situated close to the peripheral border, just beneath the test. 
