lOi 
NAUTILOIDEA. 
? 1843. Orthoceras pyrmnidale, Portlock, Rep. on the Geol. of London- 
derry, &c., p. 389. 
1844. Orthoceras pyramidale, M‘Coy, Carboniferous Foss, of Ireland, 
p. 7. 
Char. Shell straight. Section circular. Rapidly tapering, 
at the rate of about 1 in 5. Septa slightly undulating, rather ap- 
proximate, distant about f the diameter. Siphuncle small and 
central. Test smooth ? 
Horizon. Carboniferous Limestone. 
Localities. Chipping, near Preston, Lancashire ; Rathfarnham, 
Dublin. 
Well represented in the Collection by specimens presented by John 
Rofe, Esq. 
Orthoceras amabile ?, de Koninck. 
1880. Orthoceras amahile, de Koninck, Cal. Carbonifere de la Belgique, 
p. 57, pi. xxxix. IF. 7, 8, pi. xl. f. 4, pi. xlii. f. 3. 
Sp. Char. Shell straight. Section circular. Rate of increase 
about 1 in 5. Dimensions of body-chamber a little more than | the 
total length of the shell. Septa nearly equidistant in the upper 
part of the shell, but a little closer together and less equally spaced 
in the lower part ; about eight can be counted within the space of 
one inch. The siphuncle is slightly eccentric. The surface of the 
test is perfectly smooth. 
jRemarTcs. The specimen in the National Collection comes very 
near to this species, albeit there are some points of difference be- 
tween them. In the former the rate of tapering is higher than in 
0. amahile, and also the siphuncle, instead of being only slightly 
eccentric, as it is in de Koniuck’s species, is submarginal. In all 
other respects the two forms agree closely enough, and I have little 
hesitation in considering them as identical. 
Horizon. Carboniferous Limestone. 
Locality. Kildare. 
Fairly well represented in the Collection by examples presented 
by S. P. Pratt, Esq. 
Orthoceras perellipticum % Foord. 
1844. Orthoceras {Loxoceras') distans, M‘Coy, Carboniferous Foss, of 
Ireland, p. 8, pi. iv. f. 1 (not of Sowerby). 
^ As the subgenus Loxoceras has been given up, and as the specific name 
distans has been employed by Sowerby, I have substituted the above name for 
M‘Coy’s. 
