ACTINOCEEATID^. 
191 
because Sowerby’s figure represents a shell quite equal in size to 
some of the examples figured by de Koninck. As to the character 
of the siphuncle, both forms agree perfectly; and I should judge 
from Sowerby’s figure that the longitudinal stri* are quite as 
regiilar in his species as they are in de Koninck’s, though the latter 
expresses a contrary opinion. 
Horizon. Carboniferous Limestone. 
Localities. Chipping, near Preston, Lancashire; Bolland, York- 
shire. 
Fairly well represented in the Collection. The specimen from the 
first-named locality was presented by John Eofe, Esq. ; the one 
from Bolland is the type figured by Phillips in the ‘ Geology of 
Yorkshire.’ 
Actinoceras Sowerbyi, M'Coy, sp. 
1814. Orthocera undulata, Sowerby, Min. Conch, vol. i. p. 130, tab. lix. 
{Not of Schlotheim.) 
1814. Orthocera Brei/nii?, Sowerby, ibid. p. 132, tab. lx. ff. 5 5*. 
{Not of Martin.) 
1828. Orthocera undulata, Fleming, British Anim. p. 328. 
? 1841. Orthoceras imbricatum, Phillips, Pal. Foss, of Cornwall, Devon, 
and West Somerset, p. Ill, pi. xlii. f. 207. {Not of Hisinger.) 
1843. Orthoceras subimhricatum, Portlock, Deport on the Geol. of 
Londonderry, p. 391. 
1854. Orthoceras undulatum, Morris, Cat. of British Fossils, 2nd ed 
p. 312. 
1855. Orthoceras {Loxoceras) Soicerbyi, M'Coy, British Pal. Foss, 
fasc. iii. p. 573. 
[_Not 183G. Orthoceras undulatum, Phillips, Geol. of Yorkshire, pt. ii. 
p. 238, pi. xxi. f. 8.— 1844. Orthoceras laterale, de Koninck, 
Descrip, des Anim. Foss, de la Belgique, p. 508, pi. xliii. ff. 2«, b. 
1880. Orthoceras migrans, de Koninck, Faiine du Calc. Carbonifere 
de la Belgique, tom. v. p. 59, pi. xlv. f. 4 {not of Barrande). 
1880. Orthoceras Brei/nii, de Koninck, ibid. p. 73, pi. xxxviii. f. 11, 
pi. xxxix. f. 3.] 
Sp. Char. Shell straight. Section elliptical, the ratio of the two 
diameters being as 14:16. Bate of tapering about 1 in 5. Body- 
chamber at least twice as long as its basal diameter ; apparently a 
little constricted near the aperture. Septa numerous, forming a 
broad shallow sinus on the side nearest the siphuncle, and arching 
upwards laterally. Siphuncle eccentric, situated about ^ of the 
distance across the shorter diameter ; composed of a series of small 
inflated segments of moniliform aspect. Body-chamber, as seen in 
a Belgian specimen, at least twice the length of its basal diameter. 
