22 SOLENODON PARADOXUS. 



The inicostalis (Plate B, fig. 6, a) or "teres minor" is a small muscle, inti- 

 mately associated with the infraspinatus. Its origin is from the glenoid border 

 of the scapula, back about 11 mm. along the glenoid margin. Its insertion is 

 by a very short tendon just chstal to the insertion of the infraspinatus on the 

 trocliiter. According to Dobson, this muscle is lacking in Centetes, Gymnura, 

 and Potamogale. It is present, however, in Erinaceus and largely develoi:)ed 

 in Myogale. 



The meditriceps (Plate 5, fig. 6, h) is a large, prism-shaped muscle, from 

 nearly the anterior third of the glenoid margin of the scapula. It tajiers distally 

 to a short tendon inserted on the olecranon. 



The edotriceps (Plate 6, fig. 6, c) arises from a sheet of tendon on the proxi- 

 mal jiart of the crista deltoidea. It is a flat muscle and gradually increases in 

 breadth t(3 its insertion on the ectal face of the olecranon, anterior to that of 

 the meditriceps, to whose tendons for the space of about a centimeter it is here 

 intimately connected. 



The entotriceps (Plate 5, fig. 6) is divisible into three fairly distinct jiarts. 

 The first of these seems comparable with the intermedia and the caudalis divi- 

 sions as present in the cat. In Solenodon these two divisions are not to be 

 differentiated, but arise as a single muscle from the posterior side of the humerus 

 just distal to its head. The insertion is by tendon on the entero-dorsal side of 

 the olecranon as far as the sigmoid notch. A second division, probably homol- 

 ogous with the division cephalica of the cat, arises along the postero-external 

 side of the distal half of the humerus and inserts on the ectal aspect of the ole- 

 cranon, ental to the insertion of the ectotriceps. The thirtl division is ai)iiar- 

 ently the same as the division brevis, and consists of a short l:)untlle of muscular 

 fillers from the ectal surface of the epitrochlea to a tendinous raphe near the 

 distal extremity of the division cephalica. The condition of the triceps muscle 

 in Solenodon seems to be much the same as that described by Dobson for Gym- 

 nura, and one is led to infer that its relations are nearly identical in Centetes and 

 Potamogale. 



The supinator loncjxis is absent in Solenodon, as in Gymnura, Erinaceus, 

 Centetes, Potamogale, and the Talpidae. 



The biceps arises by a single head, as a strong rounded tendon al)out a centi- 

 meter in length from the dorsal lip of the glenoid fossa and base of the coracoid 

 process. Its main mass is spindle-shaped and flattened. Distally it ])asses 

 into a tendon that is inserted mainly on to the ecto-dorsal edge of the ulna, just 

 distal to the li]) of the sigmoid notch; a slip of tendinous tissue also connects 



