28 SOLENODON PARADOXUS. 



brane from the spines of the two first caudal vertel^rae. 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, rf) arises in a somewhat similar way by 

 two heads: one liy 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 slieet 

 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 liand from the postero-ventral portion of the 

 tuberosity of the ischiiun, passing to an insertion on the inner distal tuljei'osity 

 of the femur. The second portion is the larger, and arises from the entire 

 posterior border of the pelvis. It is inserted by sh(M-t tendinous fillers on the 

 ental aspect of the til)ia for a distance of 11 nmi. from its proximal head. This 

 muscle is essentially like tliat 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 acconling to 

 Dobson, who found it feeljly rei)resented, however, in Gymnura. Leche (:02) 

 considers this nmscle well developed in the last named. 



The four adductores are well developed and (luite separate. The adductor 

 longus (Plate 4, fig. 2, c) is a rather narrow band, arising from tlie 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 tlie inner condyle of the femur. Dobson 

 describes in Solenodon cubanus a second small slij) jiassing 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 graciUs from 

 the ventral portion of the pubis and ischium. It is inserted by tendinous fibers 

 for a distance of about 10 nun. along the distal third quarter of the femur on its 



