532 MR. J. C. GALTON ON DASYPUS SEXCINCTUS. 



Now Meckel, in his description of the peetoralis major in the "Tatu," says expressh 

 that this muscle has no origin from the ribs l ; besides this, the costal slip above men- 

 tioned bears very great resemblance to one of those offsets from the latissimus dorsi 



animals 



(the " Achselbogen " of German anatomists) which are by no means uncommon in the 

 human subject as slips which pass from this muscle over the axillary vessels and nerves 

 to join the tendon of the pectoralis major at its insertion. Mr. John "Wood has de- 

 eribed several such in papers read before the Royal Society, and has, moreover, su^ested 2 

 that these are " imperfect developments of the so-called dorso-epitrochlear muscle of the 



The coexistence, however, with this muscle of the costal slip which I 

 have described above, could hardly be cited in support of such a conclusion. 



Cuvicr's figure of the prolongation of the dorso-fyitrocJilien into the forearm, and of 

 its fascial termination in this region, is most distinct 3 . 



Meckel describes the latissimus dorsi in Dasijpus as coming from the vertebral column, 

 from the second thoracic vertebra, and from the third to the last rib. It then splits 

 itself into two fascicles, one for the humerus, the other for the whole anterior half of the 

 ulna and the antebrachial aponeurosis, which last is very broad 4 . 



I have examined the dorso-epitrochlien in the Tamandua, « Unau " (or Two-toed 

 Sloth), and Wombat. In the former animal, as in Dasijpus, this muscle became con- 

 tinuous with the fascia of the forearm. Eapp describes it, in the same species, as takin 

 origin, m company with the teres major, from the scapula, and being inserted at the 

 olecranon. He proceeds to state that « ein Theil seiner Sehne geht in die Fascia des 

 Vor derarms fiber, die er spannen kann » *. The same muscle is represented by Cuvier, in his 

 figures jot the Two-toed Anteater, as being continued a W distance into the forearm 





In Ckokepu, dtdactylm this muscle consists of a thin somewhat cylindrical slip, being 

 rolled on itself, and is inserted principally into the anterior ridge bounding the supra- 



eondyloKl foramen, and partly into the humerus, above the foramen, a little below the 



msemon of the coraco-bracUalu, between which terminal portions of the muscle the 

 ~° anC ^T V6SSels and nerves P ass - This muscle has no prolongation into the 

 he mvl 7* , SUpraC0ndyl0id te ~tion is figured in one of Curler's plates of 



tn. myology ot Bradyjms tridactylus 1 . 



With tt Trf "* * J* d0rSO -^ itroMU:n te ~tes at the olecranon, previously blendin 

 1" *SM ?** ° f thG m ° 8t .»— «-ion of theW A slip 



(J* 



Teasels and Zlt * • T f^™* P ° rti ° n ° f the lat ™ im ™ dorsi, over the axillary 



ZtZLTT: Tl he W8heSt ^ ° f the tend011 of «» Veotoralu major. This 

 ZnS *ZZ\ ^ PCmniCUlU3 ean ° SUS ' Wt this latter » - «*»* Went with 



jsxs^n i;:z s donK that * £s difficuit to **»*» -^ tte 



8 nm the tendon of the MMm, dorsi to that of the „ „ ^ rf ^ 



Anal 



Proc TW,1 <«- l 1M „ o-»— v-uo. v ergieica. Anal, h 

 rroc. Koyal hoc. June I860, p. 231 an •. , «„ 



'4>. eft. p. 48. D °^^-Pl-2G0. 



1 Op. at. p. 502. 

 Pp. cit. pi. 258. %. i. , Q dL pL 253. 



