1869.] THE MYOLOGY OF MENOPOMA. 257 
front of that orifice it is represented by a more or less marked ten- 
dinous interval, or linea alba, in the midst of the superficial muscles 
of the ventral portion of the abdominal muscular mass. 
The third and fourth linear divisions are placed one on each side 
of the throat, trunk, and tail. Inthe throat region the anterior end 
of this furrow forms the gap out of which the ends of the branchial 
arches protrude. In the trunk it is a mere shallow furrow, dividing 
the dorsal part of each lateral half of the muscular mass from the 
ventral portion of such half. 
In the trunk this linear division is situated above the middle (ver- 
tically) of the side of the body. In the tail it is situated at about 
the middle. 
Each dorsal portion of the lateral muscular mass (7. e. the part 
Fig. 1. 
Ww 
Superficial muscles of right side of head and of anterior part of trunk. 
D.\. Digastric. #8. Erector spine. L.A. Levator arcuum. L. D. Latissi- 
mus dorsi. Mf. Masseter. M. H.2. Mylo-hyoideus posterior. P. 8. Del- 
toid. Z. Temporalis. 7. Trapezius. 
