ESPECIALLY MYCTOPHOIDS 185 
Pectoral girdle and fin. The post-temporal has a flattened, oval dorsal limb 
articulating with the epiotic. The upper surface of the dorsal limb is ornamented 
with bony tubercles postero-medially. The ventral limb is in the form of a narrow 
antero-ventrally inclined strut. The supracleithrum articulates with a postero- 
medial facet on the post-temporal. The lateral line canal entered the post-temporal 
through a foramen in the supracleithral facet and passed through the post-temporal 
to emerge near its anterior end. 
The supracleithrum is short and stout with an expanded, elongated, head. Dorso- 
laterally it is ornamented with minute bony tubercles and more ventrally with 
raised ridges. The lateral line canal entered the posterior region of the head of the 
supracleithrum and passed anteriorly within the bone. 
The cleithrum is a large curved bone narrowing dorsally where it fits under the 
supracleithrum, and curving forwards ventrally. The anterior edge of the cleithrum 
is inclined medially forming the posterior boundary of the branchial opening. 
The endoskeletal girdle projects behind the cleithrum, and a large scapular 
foramen is visible. On the posterior edge of the scapula a large saddle-shaped facet 
forms the articulation for the anterior fin ray. The coracoid is thinner and more 
membranous than the scapula and extends forwards ventrally to contact the 
cleithrum at its tip, thus leaving a large fenestra between the two. 
Two postcleithra are present, the dorsal one being oval in shape, and attaching to 
the medial face of the cleithrum and supracleithrum. The ventral element is thin 
and curved and extends ventrally, medial to the pectoral fin. 
The pectoral fin is composed of 13 rays all of which are segmented and branched 
distally, except for the first which is unbranched. 
Pelvic girdle and fin. Each pelvic bone is an elongate triangle lying horizontally 
in the ventral body-wall about halfway along the length of the body, the insertion 
of the fin being on a level with the 21st precaudal vertebra. There is a thickened 
ventral flange running the length of each pelvic bone and anteriorly the bones are 
joined. Postero-laterally the pelvic bone is thickened to form a lateral condyle. 
Medial to the condyle the remainder of the fin rays articulated with an elongated 
facet. Medial again to this facet the pelvic bone contacts its partner in an irregular 
interdigitating suture. Each fin consists of 9 rays, all except the first being branched, 
and all segmented. 
Vertebral column. The vertebral column is shown in the restoration, Text-figure 
85. It consists of 45 vertebrae of which approximately 21 are caudal. 
The centra are almost twice as long as deep and slightly mesially con- 
stricted. Dorsally each centrum bears a neural arch and spine, and those of the 
anterior precaudal vertebrae are laterally compressed and slightly expanded. The 
neural arches represent separate ossifications from the centra ; the suture between 
arch and centrum is clearly visible along the entire length of the column. The 
precaudal vertebrae bear small transverse processes ventro-laterally on the anterior 
region of each centrum, with which pleural ribs articulate. The ribs are long, 
slender, tapering and inclined posteriorly. Each haemal arch is drawn out into a 
