PORTLAND STONE. at 
parallel with the outer distal margin of the fibula (67), with which it was connected by 
ligamentous matter from 3 to 4 lines in thickness. A short straight facet toward the 
astragalus is divided by alow angle from a longer straight facet opposite the ecto-cunei- 
forme (ce): the rest of the margin of the calcaneum is strongly rounded or convex ; it 
appears to have been closely connected with the fabella (67’), which fits into the interspace 
between the fibula and calcaneum, and whether to regard the ossicle marked 67’ as the 
apophysial lever of fibula or as the calcaneum may be a question. 
The distal tarsal row consists of three bones. The innermost or ento-cuneiform (¢?) has 
its free inner or tibial margin straight or slightly concave, joining at a marked angle the 
proximal and distal margins ; these pass into the outer margin by a regular convex line. 
The length of the ento-cuneiform is 1 inch 2 lines, its breadth 1 inch 6 Ines. 
The meso-cuneiform (cm) is transversely elliptical, but with the margin towards the 
astragalus (2) rather straight: with the same length as the preceding ossicle its breadth is 
1 inch 8 lines: the middle of its distal convexity is opposite the interspace between the 
second and third metatarsals. The ecto-cuneiform (ce) is larger than the other two bones, 
as it is in Plesiosaurus, and of a subquadrate form, one angle extending into the inter- 
space between astragalus and calcaneum; the margin toward the astragalus and meso- 
cuneiform is simply convex ; the distal margin which supported the fourth metatarsal is 
straight, as is that part of the outer margin which probably articulated with the proxi- 
mally advanced head of the fifth metatarsal. 
The first, second, and third metatarsals here preserved nearly in their natural relative 
positions, progressively increase in length as in Plesiosaurus, but are by no means so 
long in proportion to their breadth, herein retaining somewhat of the Ichthyosaurian 
character ; each, however, as in Plesivsaurus, is more convex at its proximal than at its 
distal end. 
The first or innermost metatarsal (1) is 1 inch 8 lines long, and 1 inch broad proxi- 
mally. The second, | inch 6 lines in length, has a proximal breadth of 1 inch 2 lines. 
The third, 1 inch 10 lines in length, is 1 inch 2 lines across its proximal end, 10 lines 
across its distal end, and 8 lines across its mid part. 
It is probable that before this paddle was finally or safely covered up its 
extremities had been fed upon, or nibbled at, by some predatory fishes or other aquatic 
animals of the period. The proximal phalanx of the second digit (II) has been pulled 
nearly an inch away from its metatarsal bone: it is 2 inches in length and 1 inch in 
breadth proximally, where the surface is less convex than in the metatarsals. The rest of 
the fin-bones were lost in detaching the block of stone, two or three being feebly indicated 
by depressions of the matrix. 
The length of the femur is 1 foot 7 lines: the longest diameter of the proximal end 
is 3 inches 4 lines: the breadth of the middle of the shaft is 2 inches 4 lines, that of the 
distal end is 6 inches. 
