216 UPPER CRETACEOUS TELEOSTS 
the two. The posterior part of the longitudinal limb receives the lateral line sensory 
canal from the post-temporal. The sensory canal divides within the supratemporal 
and the supratemporal commissure passes medially whilst the main branch extends 
anteriorly. The post-temporal has an elongated strut-like dorsal limb articulating 
with the dorsal surface of the epiotic, and a shorter, unexpanded ventral limb articula- 
ting with the intercalar. A large flange unites the two limbs posteriorly and forms a 
medial facet for the articulation of the supracleithrum. The lateral line canal enters 
the post-temporal through a foramen in the anterior region of the supracleithral 
facet and the canal passes through the bone to open antero-laterally. 
The supracleithrum is large, flattened and broad with a thickened anterior edge. 
The lateral line canal enters the bone mid-way down the posterior edge. The blunt 
ventral end of the supracleithrum articulates with the lateral face of the cleithrum. 
The cleithrum is unusual in that it has no noticeable dorsal extent above the 
attachment of the endoskeletal girdle. (This character is also noticed in other 
myctophiforms, e.g. Chlorophthalmus.) The posterior part of the cleithrum forms a 
small plate-like expansion ornamented with a V-shaped groove on its lateral face. 
The dorsal postcleithrum attaches to the internal face of this posterior extension. 
Ventrally the cleithrum extends anteriorly and is unexpanded but the anterior edge 
inclines medially. The endoskeletal girdle attaches to an internal flange from the 
cleithrum. 
The scapula is a small, roughly rectangular bone, thin for the most part, but with 
a thickened posterior edge. It joins the internal cleithral flange dorsally and the 
coracoid ventrally. A large oval foramen is present in the central region of the 
scapula. On the thickened posterior edge of the scapula there is a smooth saddle- 
shaped facet for the articulation of the anteriormost fin ray. 
Ventrally the coracoid is produced into a long slender process which contacts the 
anteriormost tip of the cleithrum. A large fenestra is left between the coracoid and 
the cleithrum. The postero-ventral tip of the coracoid projects back as a short 
pointed process below the fin insertion. 
Two postcleithra are present, the larger dorsal one has a thickened anterior edge 
but is thinner and rounded posteriorly. The ventral postcleithrum is a small slip 
of bone attached to the antero-ventral edge of the dorsal postcleithrum. 
The pectoral fin consists of 13 rays, all of which are segmented distally. The first 
ray is the longest and both it and the second ray are unbranched, but the remainder 
of the rays are branched. The rays are supported by four radials which contact 
the thickened posterior edge of the scapula and the scapulo-coracoid suture. The 
radials are hourglass shaped and increase in size ventrally. 
Pelvic girdle and fin. The pelvic girdle is made up of two pelvic bones connected 
in the mid-ventral line. Each bone is large with a considerable horizontal extent, 
tapering anteriorly to a point. The fin is inserted on a thickened postero-lateral 
condyle which is merely a continuation of the posterior edge of the bone. The 
condyle is supported by a lateral strengthening ridge. The medial part of the 
posterior edge of the bone, internal to the insertion of the last pelvic ray, is drawn 
out posteriorly into a very long, narrow, blunt posterior process. Weitzman (1967 : 
