1866.] Mr. J. Wood on Variations in Human Myology, 231 



author's two last papers. The sternalis hrutorum was a small developmeut 

 on the right side only, reaching from the third to the sixth costal cartilage. 

 The rest of the muscles in this column scarcely need a more extended de- 

 scription than is there found. 



No less than seyenteen out of the twenty- seven columns denoting the 

 different kinds of variety are occupied hy those of the arm, of which there 

 are seventy-one examples. 



5. Epigastric slips of the pectoralis major presented various degrees of 

 development of the so-called chondro-epitrochlear muscle of the xlpes and 

 Monkeys, but reaching only as far as the insertion of the rest of that 

 muscle into the bicipital ridge, and terminating distinctly from it. None 

 of them were so complete in their development as those described in the 

 author's first paper. One specimen is seen in fig. 1 a, in significant com- 

 bination with the ape-like variation placed in the next column. 



6. The developments of the pectoralis minor given in this column are 

 such as may easily be overlooked, but when closely sought for, as in the 

 last session, have yielded no less than five specimens out of thirty-four 

 subjects. The variety consists in the prolongation of the tendon of inser- 

 tion as a flat tendinous slip, sometimes connected with a large portion of 

 the muscular fibres, over the upper surface of the coracoid process, which 

 is grooved distinctly for its reception. This tendon then joins that of the 

 supraspinatus muscle, and blending with it and the capsular ligament, is 

 implanted into the upper facet of the greater tuberosity of the humerus 

 (see fig. 1 b). In the subject of the sketch (a female) another tendinous 

 slip was directed upwards and outwards, and lost upon the coraco-acromial 

 ligament. The insertion of the pectoralis minor into the shoulder-joint cap- 

 sule is mentioned by Meckel (^op. cit. p. 467), giving Gantzer as his au- 

 thority*. This prolongation of the tendon to the humerus reaches to a 

 greater extent in the Monkeys in proportion to the diminution in size of the 

 coracoid process. In the Carnivora it is entirely inserted into the greater 

 tuberosity, and blends more or less intimately with the pectoralis major. 

 In subject 22 the upward .direction of the insertion of the pectoralis minor 

 becomes more marked as an insertion of the upper muscular fibres into the 

 costo-coracoid membrane and the clavicle itself. The origin of the muscle 

 was in this case higher than usual, reaching to the first intercostal aponeurosis. 

 This upward development of ih^ pectoralis minor is an approximation to the 

 condition of its insertion in the Rodents, and, as the author believes, is a for- 

 mation identical with the sternoclavicular muscle, and found in subject 27, 

 column 21 (fig. 7). 



7. In this column are given two opposite tendencies of development 

 of the latissimus do?'si. Of the first are those not uncommon slips 

 of communication between this muscle and the insertion of the pectoralis 

 major, passing in front of the axillary vessels and nerves (see fig. 1 c), 

 described by Meckel, Langer, and Gruber {Achselbogen). The author re- 



* De Souza describes a case in which the whole of the pectoralis minor was inserted 

 into the capsule of the shoulder-joint (Gazette Medicale, 1855, No. 12). 



