ORTHOCEEATID^. 
31 
1848. Orthoceras Mochtreense, Salter, in Phillips’ Mem. on the 
Malvern Hills ; Mem. Geol. Surv. vol. ii. pt. i., Palseont. Append, 
p. 353. 
1852. Orthoceras Mochtreejise, M‘Coy, British Pal. Foss. fasc. ii. 
p. 315. 
1873. Orthoceras (^Actinoceras') Mochtreense, Salter, Cat. Cambr. and 
Sil. Foss. p. 158. 
1882. Orthoceras Mocktreense, Blake, British Foss. Ceph. pt. i. p. 137, 
pi. XV. ff. 6, 6 a ; also pi. x. ff. 2, 6, and pi. xi. f . 3. 
Sp. Char, Section circular. Rate of increase 1 in 10 to 1 in 13. 
Septa direct, though, a little undulating, distant -g- to the diameter. 
Body-chamber unknown. Siphuncle eccentric, inflated into a bead- 
like form between the septa. Surface with well-marked upward 
imbrications. 
Remarks. A large crushed and distorted specimen in the 
National Collection attains a length of 13 inches. 
Honzon. Upper Ludlow. 
Localities. Ludlow, Shropshire; Benson Xnot\ Kendal, West- 
moreland ; Llangynllo, Radnorshire. 
Represented by several very fine examples, the largest being 13 
inches in length and 3 inches in its greatest diameter. 
Orthoceras carinatus, Munster. 
{Ante., p. 12.) 
[Not 1856. Bactrites carinatus^ G. & F. Sandberger, Die Verstein. 
Nassau, Abth. i. p. 129, pi. xvii. if. 3, a-n.'] 
Sp. Char. Section elliptical, the ratio of the two diameters being 
as 8:7. Rate of tapering veiy^ slow, scarcely exceeding 1 in 30. 
Septa distant from J the diameter in the younger shells to | in the 
adult. The length of the body-chamber is about 4 times the diameter 
of its base, and about | the total length of the shell. The siphuncle 
is central. The surface is ornamented with very distinct undulating 
transverse striae, which have a downward imbrication, and conform 
to the outline of the aperture of the shell. 
Remarks. The “ raised keel ” (erhabene Leiste) described by 
Miinster as characterizing this species is met with in many others 
besides. It is doubtless one of the so-called normal lines ” 
described by the Brothers Sandberger {loc. cit.), which, when very 
prominent, have sometimes been mistaken for the siphuncle. 
‘ A hill 103.5 feet in height. 
