Nos. IAND2.] ANATOMY OF SCOMBER SCOMBER. 109 



and partly superficial to the supratemporal groove. As it crosses 

 the exoccipitale it is bound by ligament to it, as already described 

 in describing that bone. 



The leg or pedicle of the suprascapular arise from the ventral 

 surface of the body of the bone, at the hind end of the antero- 

 mesial process, with which process, on the ventral surface of the 

 bone, it forms a large strong V. It is broad at its base, runs down- 

 ward and almost directly foi;ward, tapers gradually to a blunt end, 

 and rests upon and is attached by ligament to the posterior proc- 

 ess of the intercalar. The lateral corner of its base forms a short 

 process directed laterally and downward, and the anterior end of 

 the supraclavicular fits in, and is held between, the dorsal edge 

 of this process and the internal surface of the body of the bone. 



The two anterior, splint-like processes of the body of the bone 

 plunge slightly into the muscle-mass that fills the temporal groove, 

 the two processes lying in the lateral and mesial ones of three 

 septal lines that separate the muscles, that fill the groove, into four 

 superficial parts. These two septa are longitudinal in direction 

 and both belong, as will be later shown, to the first intermuscular 

 septum of the trunk muscles of the fish. 



The antero-mesial process of the bone lies dorsal to the muscles 

 that fill the temporal groove, but it passes into the trunk muscles 

 as it reaches the line between the temporal and supratemporal 

 grooves, and lies ventral to the muscles that fill the latter groove. 

 It here penetrates the trunk muscles, as will be later shown, at the 

 dorsal edge of the first intermuscular septum, at the point where 

 that septum and the second septum are both attached to the hind 

 end of the skull. The second septum is continued forward, along 

 the bottom of the supratemporal groove, dorsal to the process, and 

 there is also an anterior pocket of the third septum that lies dorsal 

 to it in the same groove. 



The antero-ventral process, or leg, of the suprascapular lies in 

 the first intermuscular septum, and is attached, with that septum, 

 to the hind end of the intercalar. 



The four processes of the suprascapular thus seem to have been 

 developed m some relation to the first intermuscular septum of 

 the muscles of the trunk ; and parts of the second and third septa 

 seem to have been pushed or pulled forward dorsal to the antero- 



