MR. E. W. SHANN ON THE 
Tabulated Summary of the 
GEGEN- McMorricu 
Owen (8). Houmpury (4). BAUR (8). Maurer (6). 
Superficial. : Deep. Superficial. Deep. 
I 1 
1 1 
Supra- 1 Ist Portion. ! 
carinalis. : Incomplete |) i 
DorsaL ‘ 3 1 Cones 1 
Dorsal Mesio-dorsal 1 (directed | | ; 
Morery. | Section. Portion. backwards). | | 
| . 
I Entire r 2nd Portion. | Dera 1 
Deal a I ntir { ortion. | 
Middle Latero-dorsal 1 Cones | | I 
Cae Portion. J (directed ; 
: ' forwards). | | i 
1 1 
I ; 1 
Wateral Red fibres. 1 Red fibres. 
inves ahi Manistee 7 ra Leta ae US Ae ee ca Te om 
Red fibres. ! Red fibres. 
1 Entire 1 
Ventral LLatero-ventral | Sui E laa Cones s a Obliquus 1 Obliquus 
Middle Portion. 1 Sy (directed 3rd. Portion. externus. ! internus. 
Venrrat| Section. | Obliquus externus. ‘- | forwards). 
I 1 
Mesio- ( Lat. dorsi; 1 
MGI Merits ventral | Rectus. Foeorplete Diagonal fibres! 
c nyty ra ly aya sy 
Portion Pectoralis., (Gecied Ae RoPakiorn: Gee as 
Iheal went) . internus). 
1 Rec'tus. 
Infra- ! : 
carinalis. Carinales. ; 5th Portion. ; 
With regard to the dorsal moiety, of the writers quoted above, 
MeMurrich, Maurer, Wiedersheim, and Knauer see no reason for 
a further subdivision. 
The remainder, however, favour a division, 
but are divided as to the nature of that division, Owen and 
Humphry using the external appearance as a basis, while Gegen- 
baur, Dietz, and Chevrel refer to it in terms of internal cones 
(the difference will subsequently be shown to be of less degree 
than at first sight appears). The myocommata of the dorsal 
moiety in the trunk region are V-shaped, the apex of the V being 
directed posteriorly. The inclination of the V varies from an 
acute to an obtuse angle. Between two successive myocommata 
the muscle-fibres have often been said to run parallel to the long 
axis of the body. This is the case in the middle region, but, in 
the arms of the V, the fibres gradually become more or less 
inclined in the same direction as the arms; that is to say, if 
produced, the fibres in the upper and lower arms would meet 
behind the V. With Humphry, we will denote that portion of 
the dorsal moiety which contains the upper backwardly directed 
arms of the V as the mesio-dorsal portion, and that which 
