42 SOLENODON PARADOXUS. 
over adeep fossa. The fibula is of about the same absolute width as in Gymnura 
and articulates at its head with the ectal head of the tibia. It is therefore free 
proximally as, apparently, in Potamogale and Myogale, but not in Gymnura and 
Erinaceus. An oval sesamoid bone about 3.4 mm. in length occurs in Solenodon 
paradoxus attached by fibers to the approximated posterior edges of tibia and 
fibula. It lies in the popliteus muscle just below its origin from the femur. 
I have found no mention of such a bone in other Insectivora and it is not shown 
in Peters’s figure of the skeleton of S. cubanus. The greatest length of the 
tibia is 63 mm., and of the fibula 58.5 mm., or almost identically the same as the 
corresponding bones of S. cubanus. 
The bones of the foot (Plate 8, fig. 16), according to Dobson, are in general 
like those of Centetes. They also appear to be essentially similar to those of the 
Erinaceidae. There is, however, a remarkable development of the proximal 
portion of the entocuneiforme, whose ventral border is continued posteriorly so 
as to meet the antero-internal edge of the os calcis. This portion also articulates 
dorsally with the ental surface of the astragalus and passes ventral to the navic- 
ulare which thus rests partly upon it. The last-named is small and trapezoidal 
in shape, articulating with part of the distal face of the astragalus. The meso- 
cuneiforme is about half the size of the ectocuneiforme and the two articulate 
with the second and third metatarsals respectively, as usual. The cuboid is 
large, and its expanded proximal end articulates with the os calcis. ‘The fourth 
metatarsal is supported by its distal end, as likewise the ental corner of the fifth, 
which rests in part on the base of the former. There is a well developed pre- 
hallux of two separate bones. The more proximal is small and nearly round, 
about 1.5 mm. in diameter, at the ento-posterior edge of the naviculare. The 
more distal bone is flattened, about 5.5 mm. long, and slightly less than 2 mm. 
distally where it reaches its greatest breadth. Peters has figured a similar 
prehallux for the Cuban Solenodon. 
The metatarsal of the hallux has a ventral outer projection at the base, 
that partially overlaps the base of the second metatarsal from the plantar 
aspect. A much less imbrication is shown by the base of the second and the 
fifth metatarsals. No such development was noted in Gymnura and Erinaceus. 
The three middle digits, 2, 3, 4, are subequal in length; the fifth is shorter, 
and the first a trifle shorter still. This last has two phalanges, like the pollex. 
As in the manus,:there are two small sesamoids at the base of all the proximal 
phalanges, and a minute median sesamoid ventrally at the last joint of each digit. 
It remains to describe briefly the laryngeal and hyoid bones (Plate 7, fig. 3). 
