106 
NAniLOIDEA. 
at right angles to the long axis of the shell, but very slightly 
waved ; surface not distinctly seen, but apparently smooth ” 
(M‘Coy). Siphuncle moderately large, nearly central. 
Remarks. This species is distinguished from 0. cylindraceum by 
its more numerous chambers. de Koninck observes with 
reference to the Belgian form of the present species, that it is found 
exclusively in the upper beds of the “ Calcaire carbonifere,” in 
which horizon it is found in abundance at Yise (Assise vi.). It was 
found also by M. de Yerneuil in the “ calcaire” of Cosatchi-Datchi 
in the Oural, which belongs to the same beds. M. de Koninck 
adds : — “ If, as I suppose, the 0. ince.quiseptum, J. Phillips, is identi- 
cal with the preceding species [0. calamus\ it exists also in the 
[Carboniferous] limestone of Bolland, in Yorkshire.” De Koninck 
mentions also the occurrence of his species at Settle, A'orkshire, in 
various places in Ireland, and in Scotland. It therefore appears 
that 0. calamus and 0. incequiseptum are identical ; and that being 
the case, Phillips’s species takes precedence. 
Horizon. Carboniferous Limestone. 
Localities. British. Bolland, Yorkshire ; Ell Bolton. — Foreign. 
Yise, Belgium. 
Fairly well represented in the Collection. One of the specimens 
forms part of the “ Gilbertson Collection ” in this Museum, and was 
figured by Phillips in his ‘ Geology of Y^orkshire ’ (loc. cit.). 
The specimen from Ell Bolton was presented by J. E. Lee, Esq. 
Orthoceras cinctum, Sowerby. 
1829. Orthocera cincta, Sowerby, Min. Conch, vol, vi. p. 168, tab. 
dlxxxviii. f. 3. 
1836. Orthoceras cinctum, Phillips, Geol. of Y^orkshire, pt. ii. p. 237, 
pi. xxi. f. 1. 
1840. Orthoceratites cinctus, Miinster, Beitrage zur Petrefacteukunde, 
Heft iii. p. 99, Taf. xix. f. 4, a, b. 
? 1841. Orthoceras cinctum (?), Phillips, Pal. Foss, of Cornwall, Devon, 
and West Somerset, p. 109, pi. xli. f. 204. 
? 1842. Orthoceratites cinctus, d’Arch. & de Yem. Trans. Geol. Soc. 
vol. vi. pt. 2, p. 385. 
1844. Oiihoceras cinctum, M‘Coy, Carboniferous Foss, of Ireland, p. 7. 
1844. Orthoceras cinctum, de Koninck, Descrip, des Anim. Fossiles de 
la Belgique, p. 512, pi. xliii. f. 6, a, h, pi. xliv. f. 5, a, b, ? pi. xlvii. 
f. 3, a, b. 
1876. Orthoceras cinctum, Armstrong, Y’’oung, and Robertson, Cat. of 
Western Scottish Fossils, p. 59. 
Sp. Char. Shell straight. Section circular. Rate of increase 
about 1 in 8. Septa rather remote, judging by the example figured 
