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to coalesce with the trapezius, infraspinatus, pectoralis major, supinator 

 longus, and brachialis anticus, and in this instance with the triceps. 



The relation of the teres major to the latissimus dorsi sometimes 

 is the subject of variation. Usually these muscles are united along the 

 lower or upper border, and a bursa intervenes between the surfaces ; 

 tliis. however, is sometimes absent, and perfect coalescence may, though 

 very rarely, take place. The anconeus and the triceps were inseparable 

 in several cases: coalescence of the brachialis anticus with the supinator 

 longus I have again noticed, as described in my last paper. 



A fasciculus of fibres in one subject dipped from the deep surface 

 of the biceps, and passed downwards into the substance of the brachialis 

 anticus. This is contrary to the direction of any connecting slip that 

 has been hitherto described. 



The pectoralis major I have frequently seen united with the ori- 

 gin of the external oblique ; and the band described before as passing 

 from the coraco -brachialis to the brachialis anticus I have likewise 

 found frequently as before mentioned. Slips uniting the flexors sub- 

 limis and profundus digitorum are likewise frequent, as are connexions 

 between the two radial extensors of the carpus. 



The flexor pollieis longus gave off in one specimen the deep flexor 

 tendon to the index ringers — an arrangement of great interest, when we 

 consider the relative position of these flexor tendons in the Quadrumana. 

 In the chimpanzee. Professor Humphry found the flexor pollieis repre- 

 sented in one ins: nice by a slender tendon from the palmar fascia, the 

 condition found by Huxley in the gorilla : in another, by a tendon from 

 the ulnar side of the flexor profundus digitorum. The front of the radius 

 was occupied in this animal by the indieial part of the flexor pro- 

 fundus. Wilder describes the index and pollieeal portions of the flexor 

 in the chimpanzee as separate from the rest of the muscle, as in the ano- 

 maly just described : and Duvernoy states that the same arrangement 

 existed in the gorilla. In three specimens of liacacus, Halford has 

 found that, once the flexor pollieis was conjoined with the common 

 flexor; while in two others it was as in man. In JTaeacw siniens I 

 found the flexor pollieis tendon to arise from the middle of the surface 

 of the flexor profundus ; and the same is described by Haughton, in 

 JfaeacHS nemesfrinus, a condition which Dr. Finney has found as an 

 anomalous condition of these tendons in man. The same arrangement 

 is found in Cercopithecus fuh\qino$u$ ^ Haughton, "Proceedings. Poyal 

 Irish Academy," 1S65, p. 64\ while in Lagothrix and Cebus it is the 

 most external of the tendons of the flexor profundus which goes to the 

 thumb. Several of the Quadrumanous types of flexors I have described 

 in the "Proceedings of the Natural History Society of Dublin" for 

 1S66. 



Among the pollieeal groups unions were not unfrequent; the extensor 

 ossis metacarpi pollieis and primi internodii were often united, a single 

 belly giving off the double tendons. 



Another specimen of union between the gluteus medius and pyri- 



