SUMMARY. 51 
simple and resembles that of Potamogale and -Chrysochloris in being composed 
of the last three cervical and first dorsal nerves, with the partial exception of 
the one instance mentioned in which a slender thread from the fifth cervical 
entered the complex. In Solenodon cubanus the fifth cervical nerve seems to 
enter as a major element of the plexus and the same is true in the Centetidae. 
This fact is of interest in connection with the additional dorsal vertebra in Soleno- 
don paradoxus as compared with the more specialized condition in S. cubanus. 
The lumbo-sacral plexus (Plate 6, figs. 2, 3) of S. paradoxus was dissected 
in three individuals and found to differ from that figured by Dobson for S. 
cubanus. The chief nerves composing the plexus are the second, third, and 
fourth lumbars, and the first sacral. In Centetes the second sacral in addition 
enters into the complex, and this was found to be the case in one of the specimens 
of Solenodon paradoxus. The anterior crural and the obturator nerve arise 
mainly as branches of the second lumbar in two individuals while in a third 
they are from the third lumbar. In this specimen the great sciatic is neverthe- 
less, mainly from the fourth lumbar as in the two other individuals. Dobson’s 
figure of the lumbar plexus in S. cubanus shows the anterior crural and the 
obturator arising together as in S. paradoxus, but from the fourth lumbar while 
the sciatic is composed of trunks from the first two sacrals. It is possible that 
confusion has arisen in numbering the several trunks, as otherwise the condition 
in the two species is the same. In S. paradoxus all the lumbar nerves virtually 
enter into the plexus by the first lumbar nerve sending a minute filament pos- 
teriorly to unite with the next following nerve as it issues from its foramen. 
SUMMARY. 
In external and cranial characters, Solenodon paradoxus differs very mark- 
edly from S. cwbanus as has been recently pointed out by Dr. J. A. Allen (:08), 
who has suggested that these differences may be considered of subgenerie value. 
In view of his careful summary, it is needless to repeat his conclusions here. 
It may be added, however, that the presence of a white nape spot is a fairly 
"constant character of S. paradoxus, instead of an individual variation as seemed 
to be indicated by the specimens heretofore known. Further, the supposed 
glandular surface of the thighs is an appearance apparently due to poor preser- 
vation. The presence of long coarse hairs in the pelage in addition to the finer 
1 ones in S. paradoxus may indicate a step toward the spiny condition of certain 
other Insectivora. 
