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 
tO OSCE Bic BR SAU its, tye Sites oats aan viedo 179 
Length uitail toithe samen: Geshe te ih ee Sie. 60°8 
Length of pectoral limb to the same .............- 23°7 
Length of pelvic to the same .. 2... ..0 20... 27°5 
Myo.uoey. 
As in Menopoma, so in Menobranchus, the general muscular in- 
vestment 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. Imme- 
diately 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 dorso- 
lateral 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 verte- 
bree and ribs, but having no direct connexion with the pectoral 
and pelvic arches. [It is a continuous thick fleshy mass, not diffe- 
rentiated into distinct muscles. Its fibres are all antero-posteriorly 
directed. 
Each ventral portion of the lateral muscular mass (7. 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, 
