ACirsrOCEEATIDJE. 
175 
RemarTcs. The greatest length of the shell described by Dr. Wood- 
ward was about 4 inches, the greatest diameter 2 inches, the least 
diameter 1 inch 4 lines. I^either the apex nor the body-chamber 
were preserved. 
The specimen representing this species in the National Collection 
consists of five segments of the siphuncle, with two or three of the 
septa attached, the spaces between the latter being filled, as in the 
type specimen, with crystalline limestone. 
Dr. Woodward observes that A. baccatiim “ most closely resembles 
A. pyramidatum of W‘Coy, both in the beaded form of the siphuncle 
and the general proportions of the chambers, but the beads of the 
siphuncle are much less spherical in A. pyramidatum^ and the sides 
of the chambers form a less acute angle at their junction with the 
outer wall of the shell than in the fossil before us.’^ 
Horizon. Woolhope Limestone. 
Locality. Aymestry, Herefordshire. 
Eepresented by a single imperfect fragment in the Collection. 
Actinoceras subconicum, d’Orbigny, sp. 
1839. Ortlioceras coniciim, Sowerby, in Murchison’s Sil. Syst. pi. xxi. 
f. 21. (Not of Hisinger.) 
1849. Orthoceratites subconiciis, d’Orbigny, Prodr. de Paleont. vol. i. 
P- 2. 
1882. Ortlioceras suhconicum, Blake, British Foss. Ceph. pt. i. p. 150, 
pi. xii. f. 9. 
Sp. Char, The section appears to be not far from circular. The 
rate of increase is essentially great, at least 1 in 5. No body- 
chamber has been seen connected with the peculiar siphuncle of 
this species ; but there are some specimens having about this rate 
of increase coming from lower rocks, which may belong to it ; these 
have signs of a constriction below the aperture. The septa vary in 
distance with age, being -1 of the diameter when young, and in- 
creasing in closeness up to when larger. The siphuncle is 
always central in the sections seen, and one shows it nearly central 
on the septal surface. The inner and outer coats of the siphuncle 
are always separated by deposits on their surface, and there are 
similar deposits in the septa ; the outer coat had folds on its surface ; 
the whole occupies from 5 to | the diameter.” {Blalce.) 
RemarTcs. To this species I have referred some specimens which 
agree in all essential points with the characters of Sowerby’s type 
as described by Prof. Blake. I have no hesitation in regarding this 
form as an Actinoceras ; the structure of the siphuncle, with its 
inner tube, clearly indicates such an afiinity. The closeness of its 
