24 SOLENODON PARADOXUS. 



In Ccntetes and Erinaccus this muscle is said to be insei'tcd into a sesamoid at 

 the base of metacarpal 5. 



The indicator (Plate 6, fig. 5, /) arises from an origin about 25 mm. long by 

 muscular fibers along the ectal border of the ulna beginning near the distal edge 

 of the sigmoid notch. The muscle then passes across to the ental aspect of the 

 forearm, through the groove between the distal ends of the radius and ulna as a 

 flat narrow tendon. At the carpal region the tendon divides into two, the more 

 ental of which passes to a tendinous insertion about the dorsal base of tlie first 

 phalanx of digit 1 ; the more ectal branch goes to a similar insertion on the ecto- 

 lateral aspect of the first phalanx of tiigit 2'. A similar condition is found in 

 Erinaceus and Centetes. 



The extensor ossis victacarpl pollicis (Plate 6, fig. 5, d) arises by muscular 

 fibers along the ajiproximated edges of radius antl ulna from the region of the 

 greater sigmoid notch, distally to within 5 mm. of the carpus on tlie idiia and to 

 within about twice that distance on the radius. It then [lasses as a tendinous 

 band, oblicjuely over the distal surface of the radius to the base of an elongated 

 sesamoid bone on the ental side of the carpus, and to the ento-lateral aspect of 

 the base of the first metacarpal. The relations of tliis muscle are said to be the 

 same in Centetes. 



The pronator teres (Plate 6, fig. 5, c) has its origin by short tendinous fibers 

 from the epitrochlea and passes ectally as a flat sheet to a long tendinous inser- 

 tion on about the middle third of the dorsal edge of the proximal portion of the 

 radius. 



The flexor carpi i-adialis (Plate 6, fig. 6, b) is from the anterior border of the 

 epitrochlea, arising by tendinous fibers as a long, spindle-shaped muscle. This 

 passes into a round tendon whose insertion is at the ventral ental side of the 

 base of metacarpal 3. Dobson does not mention this muscle in Centetes, but 

 states that in Erinaccus and Potamogale it goes to the base of the second meta- 

 carpal. Its condition in Solenodon paradoxus is thus more nearly that found in 

 the cat, in which a small branch passes also to the first metacarpal. 



The flexor carpi idnaris (Plate 6, fig. 6, c) arises from the internal condyle of 

 the humerus and is inserted by a strong tendon into the pisiform bone as in 

 Erinaceus, Potamogale, and Centetes. 



The flexor sublimis digitorum (Plate 6, fig. 6, o) is a narrow flat muscle whose 

 origin is wedged in between the heads of the flexor profundus digitorum. It 

 arises as a flat tendon about 12 mm. long from the anterior surface of the epi- 

 trochlea, about one or two millimetei's from the ental margin. The muscular 



