684 MESSIIS. B. C. A. WIA'DLK AND 1?. G. tAESOJSS 0^' [BeC. 17, 



lu the Came] (18) and G-iraffe (30, 31) the rhomboids are very 

 small aud only reach the second or third thoracic spioe ; indeed, 

 in the latter animal Joly aud Lavocat (XII.) deny its existence. 

 The nerve-siipply of the thoracic portion of the muscle is from 

 the 6th cervical in the Horse (57) and Hyx-ax (68) ; in the latter 

 animal the rhomboideus capitis et colli was supplied by the 4th 

 and possibly 5th cervical. 



Subdaviiis and Sterno-seapularis. — As the clavicle is always 

 wanting, the subclavius, if it is present at all, is always continued 

 from the junction of the first or more ribs with the sternum to 

 the fascia over the supraspinatus. It is present in the Hippo- 

 potamidfB (J, 3), Suidte (4, 6, 7, 8, 11, 12, 13, 14), Tragulidae (21) 

 (not mentioned by Kinberg (20)), Cervidse (24, 27), Tapiridse (50, 

 52, 54, 55), Equida3 (57, 58), Khinoeeros (64), Procaviidae (67, 68), 

 and Elephantidse (72, 76). 



In the Tragulidse and Cervidee the muscle is small and possibly 

 often absent, as no mention is made of it in many of these animals. 



In the Tapiridse, Equidse, and Procaviidee the origin is from the 

 sternum and first three costal cartilages. 



In the Bovidae the muscle may be present or absent, but if it is 

 present it is always very small. Chauveau (II.) found it in the Ox 

 (32), but not in the Sheep (39) or Goat (47). Lesbres (V.) says 

 it is present in Ruminants as a small bundle which joins the 

 cephalo-humeral at the clavicular intersection, while Bourgelat 

 (quoted by Lesbres) describes it as absent, and Rigot (also quoted 

 by Lesbres) as fused with the pectoralis quartus. In our own 

 dissections it was fully developed though small in the Antelope 

 (49), rudimentary in the Fat-tailed Sheep (43), and altogether 

 absent in the Mouflon (45). 



We have unfortunately no records of it in the Camelidse and 

 Giraffidse, but if it had been at all well marked its presence would 

 probably have been noticed. In consulting the literature of this 

 muscle the reader should bear in mind that it has many synonyms 

 and that only recently has it been recognized as a distinct muscle ; 

 it is most often found with the description of the pectoral group. 



The nerve-supply comes from the 5th and 6th cervical in the 

 Pig (9) and Peccary (14), from the second root of the phrenic in 

 the Pig (8), from the phrenic and 7th cervical in the Duiker- 

 bok (49). 



Levator angidi scapulce and Serratus niagnus (Sermtiis ventralis 

 colli et thoracis). — The following origins of these muscles are 

 recorded by ourselves and other observers ; — 



OerA'ical 

 t-i'ansvei-t;e pivjces.s. Ribs. 



liippopotanuus (1). 1-7. 1-8. 



Hippopotamus (3). . . 1-11. 



Pig (4) 1-7. 



Pig (8) 1-7. 



Pig (9) 1-7. 1-6, 



