176 
KATJTILOIDEA. 
test. The surface of the test is perfectly smooth, there being only 
very faint transverse lines of growth visible upon it. Obscure 
longitudinal lines are seen upon the cast of the body-chamber in 
some places, and one of the specimens (Sowerby Coll., IS^o. 43848) 
shows part of the scar of the shell-muscle very distinctly. Traces 
of it are also visible upon the specimen figured (Xo. C. 297). 
Remai'lcs. The British examples of this species differ from the 
Belgian ones, as figured by de Koninck, in having a greater number 
of septa — twenty-three or twenty-four in a complete whorl, but in 
other respects the two forms agree. 
Horizon. Carboniferous Limestone. 
Locality. Kildare, Eathkeale (co. Limerick). 
Well represented in the Collection. 
Solenocheilus pentagonus, J. Sowerby. 
? 1809. Conchyliolithus Nautilites ingens, Martin, Petrificata Derbieusia, 
p. 17, pi. xli. f. 5. 
1819. Nautilus pentagonus, J. Sowerby, Min. Conch, vol. iii. p. 89 
pi. ccxlix. f. 1. 
1836. Nautilus ingens, Phillips, Geol. of Yorkshire, pt. ii. p. 232, 
pi. xliii. f. 4. 
1819. Nautilus pentagonus, d’Orbigiiy, Prodr. de Paleont. Stratigr. 
vol. i. p. 111. 
1849. Nautilus ingens, d’Orbigny, ibid. p. 111. 
1854. Nautilus ingens, Morris, Cat. of British Fossils, 2nd ed. p. 308. 
1854. Nautilus pentagonus, Morris, ibid. p. 308. 
1855. Nautilus ingens, M‘Coy, British Palaeozoic Fossils, fasc. iii. 
p. 559. 
? 1860. Nautilus ingens, Eichwald, Lethaea Rossica, Seconde Sect, de 
I’ancienne Periode, vol. i. p. 1309, pi. xlv. f. 2. 
1874. Nautilus ingens. Young and Armstrong, Trans. Geol. Soc. Glas- 
gow, vol. iv. pt. iii. p. 280. 
1876. Nautilus ingens, Armstrong, Young, and Robertson, Cat. of 
Western Scottish Fossils, p. 59. 
1878. Nautilus pentagonus, de Koninck, Faune du Calcaire Carboni- 
fere de la Belgique (Annales du Mus. Roy. d’Hist. Nat. de Bel- 
gique, tom. ii.), p. 106, pi. xiii. ff. 4, 5 5 b. 
1878. Nautilus bifrons, Me Koninck, ibid. p. 114, pi. xv. f. 3, pi. xvi. 
ff. 1, 2. 
1883. Asymptoceras bifrons, Hyatt, Proc. Boston Soc. Nat. Hist, 
vol. xxii. p. 297. 
[_Not 1851. Nautilus ingens, de Koninck, Descrip, des Anini. Foss, du 
TeiT. Carbonifere de Belgique (Supplem.), p. 710, pi. lx. f. 1. — 
1878. Nautilus ingens, de Koninck, Faime du Calcaire Carboni- 
fere de la Belgique (Annales du Mus. d’Hist. Nat. de Belgique, 
