208 F. R. Cowper Reed—Haverfordwest Fossils. 
The pelvis and hind-limb are small and evidently undergoing 
reduction. The ilium is a sickle-shaped bone, thin above, but 
thickening towards its ventral end, where it bears two articular 
surfaces, one forming part of the acetabulum, the other uniting with the 
ischio-pubis; probably all connection with the vertebral column was lost. 
The pubis and ischium (Fig. 4) are fused with one another at their 
upper and lower ends, the line of separation being marked by a slit- 
like foramen (00.f.) and sometimes by a notch in the ventral border. 
At the thickened upper ends of the combined bones there are two, 
roughened surfaces, the smaller (7/.f.) for union with the ilium, the 
larger (acet.) forming the greater part of the acetabulum; the two 
bones are so closely united at the upper end that even in very young 
examples it is impossible to determine what share in the formation of 
these facets is taken by each. LDistally the bones are thin, and there 
is no clear indication that the opposite sides met in a median 
symphysis. 
The femur (Fig. 5), though much smaller than the humerus, is on the 
whole very similar in form to that bone, with the important exception 
that it unites distally with two elements only, the tibia (¢.) and 
fibula (f.). Of these the fibula is the larger, at least except in some 
cases in which the thin anterior edge of the tibia is fully ossified. 
The proximal row of carpals are three in number, the tibiale (¢0.), 
intermedium (7n¢.), and fibulare (fid.); the distal row also consists of 
three only, while the remainder of the tridactyl (1-111) paddle consists 
only of irregularly-shaped metatarsals and nodule-like phalanges. 
The above account is merely a brief summary of the complete 
description which will be given in the Catalogue and illustrated with 
figures of most of the bones of the skull and skeleton. 
IV.—Srpewick Muszum Norts. 
New Fossrzs rrom Haverrorpwesr.— VII. 
' By F. R. Cowrrr Rerb, M.A., F.G.S. 
(PLATE V1.) 
SLADINA CATENIFORMIS, gen. et sp. nov. (Pl. VI, Figs. 1-7a, ? 8—9a.) 
N the Slade Beds of Upper Slade there occur small flattened leaf-like 
bodies generally fused together in a linear series of 2—4, but some- 
times singly. These fossils have a somewhat puzzling aspect, but they 
may be referred without any doubt to the Bryozoa, though to a new 
and undescribed genus and species. 
Diagnosis.—Zoarium composed of a single linear row of leaf-lke 
segments, each of which is usually lanceolate in shape, thin, flattened, 
and tapering anteriorly. The segments are generally graduated in 
size, and each is fused by its apex to the base of the one preceding it, 
but the terminal one, which is the smallest and narrowest of the 
series, ends freely in a point, and possesses a perfect lanceolate form. 
Each leaf is bilaterally symmetrical and unilaminar ; the reverse face 
is slightly convex, ridged axially, and covered with a thm epitheca 
bearing a median longitudinal midrib continuous from leaf to leat 
throughout the whole series in the zoarium; on each side of the midrib 
