0KTH0CERATID.5:. 
113 
1862. Loxoceras incomitatum, Griffitli, Journ. Geol. Soc. of Dublin, 
vol. ix. p. 33. 
1876. Orthoceras Goldfiissianum, Armstrong, Young, and Robertson, 
Cat. of Western Scottish Fossils, p. 59. 
1880. Orthoceras Goldfussianum, de Koninck, Faune du Calc. Carbo- 
nifere de la Belgique, pi. xxxviii. ff. 8, 9. 
Sp. Char. Shell straight. Section circular, or nearly so, but 
generally elliptical through compression. Increasing rather slowly 
in diameter, at the rate of about 1 in 8. Septa verj* deep, approxi- 
mate in the young, and becoming more distant as the shell increases 
in growth. About 40 septa may be counted in a complete individual. 
The body- chamber occupies ^ of the total length of the shell. The 
margin of the aperture is slightly contracted, but not sinuous. Si- 
phuncle subcentral ; though of cylindrical form, it is slightly con- 
stricted as it passes through the necks of the septa. The surface of 
the test is smooth or marked only with fine strite of growth. 
Remarl'S. M. de Koninck refers 0. ovah of Phillips to this species, 
but according to M‘Coy's description of the former it tapers very 
slowly, and the septa are said to be only Id line apart, whereas in 
0. Goldfiissianum they are distant 3 lines. 
Horizon. Calcaire Carbonifere (Assise vi.) = Carboniferous Lime- 
stone. 
Locality. Vise, Tournai, Belgium. 
Fairly well represented in the Collection. 
Orthoceras conquestum, do Koninck. 
1844. Orthoceras conquestum, de Koninck, Descrip, des Anim. Fossiles 
de la Belgique, p. 514, pi. xlv. f. 4. 
1849. Orthocerratites conquestus, d’Orbigny, Prodr. de Pal^ont. Strati- 
graphique, vol. i. p. 113. 
1851. Orthoceras conquestum, Giebel, Faima der Vorwelt, Band iii. 
Abth. i. p. 251. 
1880. Orthoceras conquestum, de Koninck, Faune du Calc. Carbonifere 
de la Belgique, p. 68, pi. xli. f. 7. 
\_Cf. 1836. Orthoceras fliferum, Phillips, Geol. of Yorkshire, pt. ii. 
p. 238.] 
Siy. Char. Shell straight, very elongate, and slowly tapering. 
The septa rather deep and subhemispherical ; their distance about 
I of their transverse diameter. The body-chamber has not been 
observed. The siphuncle is relatively broad, and its diameter is equal 
to y^oth of that of the septum ; its situation is submarginal. The 
test is ornamented with very regular, direct, transverse striae, and 
these are accompanied by small and indistinct annulations, of which 
about twelve or thirteen occupy the space between two septa. 
I 
