BS SOLENODON PARADOXUS. 
brane from the spines of the two first caudal vertebrae. The two branches 
shortly unite to form a broad thin tendinous sheet that inserts on the ectal 
portion of the head of the tibia and condyle of the femur. Its condition is thus 
practically as in Gymnura. In Centetes and Potamogale the insertion is upon 
the fibula. 
The semitendinosus (Plate 6, fig. 1, d) arises in a somewhat similar way by 
two heads: one by tendinous fibers from the dorsal spines just posterior to the 
origin of the dorsal branch of the biceps; the other from the tuberosity of the 
ischium posterior to the biceps. These two heads unite to form a single sheet 
of muscle that passes to an insertion some 9 mm. in length on the antero-ental 
side of the tibia, 22 mm. below its head. It resembles the same muscle in Cen- 
tetes, Potamogale, and Myogale, rather than in Gymnura. 
The semimembranosus (Plate 4, fig. 2, d) is very large and divisible into two 
portions. The first is a narrow band from the postero-ventral portion of the 
tuberosity of the ischium, passing to an insertion on the inner distal tuberosity 
of the femur. The second portion is the larger, and arises from the entire 
posterior border of the pelvis. It is inserted by short tendinous fibers on the 
ental aspect of the tibia for a distance of 11 mm. from its proximal head. This 
muscle is essentially like that of Centetes in its attachments. In Gymnura and 
Potamogale it is less extensive in origin and has but one head. 
The sartorius is absent, as also in Centetes and Potamogale according to 
Dobson, who found it feebly represented, however, inGymnura. Leche (:02) 
considers this muscle well developed in the last named. 
The four adductores are well developed and quite separate. The adductor 
longus (Plate 4, fig. 2, c) is a rather narrow band, arising from the anterior edge 
of the pubis, just ventral to the origin of the pectineus. It inserts as a tendi- 
nous sheet on the ental surface of the inner condyle of the femur. Dobson 
describes in Solenodon cubanus a second small slip passing to the femur at the 
middle third of the shaft, but no such part was found in S. paradoxus, which 
therefore resembles Potamogale in respect to this muscle. In Gymnura and 
Centetes, however, Dobson describes a long insertion nearly the whole length of 
the femur, so that the condition he describes in S. cubanus is intermediate be- 
tween that of Gymnura and Centetes on the one hand, and S. paradoxus and 
Potamogale on the other. 
The adductor brevis (Plate 4, fig. 2, e) arises under cover of the gracilis from 
the ventral portion of the pubis and ischium. It is inserted by tendinous fibers 
for a distance of about 10 mm. along the distal third quarter of the femur on its 
