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Show 452 MR. ST. GEORGE MIVART ON THE [June 24, inches. Breadth of mid-tail to its height at 100 33*0 Height of body to length from pelvic girdle to cloaca at 100 179 Length of tail to the same 60*8 Length of pectoral limb to the same 23*7 Length of pelvic to the same 27*5 MYOLOGY. As in Menopoma, so in Menobranchus, the general muscular investment of the body may be divided into four longitudinal portions separated by four more or less marked antero-posteriorly directed lines of demarcation. Each of the longitudinal muscular masses is more or less clearly divided and cut up by transverse tendinous intersections, which are most marked in the hinder part of the body and the anterior part of the tail. Of the four lines of demarcation, only the dorsal one is much marked in the trunk. This extends from the mid-cranial region to the end of the tail; and above the caudal portion of it is a mass of fatty bodies which fill up the dorsal caudal fin. A similar mass fills up the ventral caudal fin and the caudal part of the ventral line of demarcation, almost as far forwards as the cloacal aperture. Immediately in front of that aperture, and extending thence forwards to the hinder margin of the pelvis, a very large thick glandular cushion is interposed, separating the longitudinal muscular masses more widely than they are separated in any other part of the body. In front of the pelvis the ventral line of demarcation is formed by the but-little-marked linea alba. The lateral lines of demarcation extend from the throat to the end of the tail; and the anterior end of the furrow widens into the gap, out of which the branchial arches protrude. In the trunk this linear division is situated rather above the middle (vertically) of the side of the body. In the tail it passes along the middle, each dorsolateral caudal muscular mass being about equal in extent to each ventro-lateral caudal muscular mass. Each dorso-lateral muscular mass extends from the upper surface of the skull to the distal end of the dorsum of the tail, investing the transverse processes, neural arches, and spines of the vertebrae and ribs, but having no direct connexion with the pectoral and pelvic arches. It is a continuous thick fleshy mass, not differentiated into distinct muscles. Its fibres are all antero-posteriorly directed. Each ventral portion of the lateral muscular mass (i. e. the part between the lateral linear groove and the linea alba and the caudal continuation of that part) extends from the urohyal to the end of the ventral portion of the tail, interrupted, however, by the pelvis and by the interposed large glandular cushion behind it. As in Menopoma, the trunk portion of the ventral lateral mass, |
