>'aUT1L1D^. 
1'27 
shaped umbilicus, perforated iu the centre. Tlie whorls are dis- 
tinctly subquadrate in section. The periphery is broad and slightly 
concave, with two keels on each side, one upon the outer edge and 
the other just inside it. The sides, which are not quite as wide as 
the periphery, slope a little outwards towards the umbilical margin ; 
their surface is slightly convex, and there are traces on the inner 
whorls of broad, transverse folds, which become obsolete when the 
outer whorl is reached. The surface of the test is ornamented with 
fine lines of growth, which form a deep sinus upon the peri- 
phery, corresponding with the emargination of the aperture. Fine 
longitudinal lines are also present on and between the keels on 
each side of the periphery, but they do not appear to be developed 
elsewhere. The cast beneath the shell is marked by a series of 
minute, interrupted, incised lines and punctures, indicating that the 
surface of the mantle was granular and wrinkled, as in Coelomutilas 
cariniferus, ttc. (fig. 15). 
The body-chamber occupies at least half of the last whorl, its 
aperture is not preserved iu any of the specimens examined. 
The septa are very approximate, and number thirty-eight to a 
whorl in a specimen whose greatest diameter is inches. Tbc 
siphuncle is situated a little above the centre. 
liemarls. The distinguishing characters of this species are its 
slow rate of tapering and the quadrate form of the whorls. The 
species which comes nearest to it is Coelonautilus suhsuleatus, 
Phillips, sp. ; but C. graclus has a much less rapid rate of increase, 
closer septa, and proportionately broader periphery than Phillips’s 
species. 
Horizon. Carboniferous Limestone. 
Locality. Kildare. 
Well represented in the Collection. 
Coelonautilus globatus, J. dc C. Howerby, sp. 
1821. Nautilus ylobahis, J. de C. Sowerby, Min. Conch, vol. v. p. 120, 
pi. cccclxxxi. 
? 1828. Nautilus Wrujhtii^ Fleming, History of Biitish Animals, 
p. 230. 
1834. Nautilus glohatus, Kloden, Verstein. der Mark Brandenburg, 
p. 126. 
1834. Nautilus glohatus, Keferstein, Naturgesch. des Erdk. Band ii. 
p. 506. 
1842. Nautilus glohatus, d’Arcliiac and de Verneuil, Trans. Geol. Soc. 
ser. ii. vol. vi. pt. ii. p. 386. 
? 1843. Nautilus glohatus, de Koninck, Descrip, des Anim. Foss, du 
Terr. Carbonifere de Belgique, p. 554, pi. xlvii. ff. 11 a, 11 b. 
