ESPECIALLY MYCTOPHOIDS 29 
Pectoral girdle and fin. The incomplete pectoral girdle is shown in medial view in 
Text-figure 12. The cleithrum is a large sigmoid bone with a flattened lateral extent 
and a medially inclined anterior edge. 
The scapula is irregularly shaped with a large scapular foramen near its centre. 
On the posterior edge of the scapula is a large saddle-shaped facet for the articula- 
tion of the anterior fin ray. Ventral to this facet the scapula edge is excavated 
longitudinally forming a facet for the reception of the fin radials. 
The coracoid is larger than the scapula and antero-laterally is attached to a 
medial flange on the internal face of the cleithrum. The coracoid is produced antero- 
ventrally into a stout flattened process. 
A mesocoracoid arch connects the coracoid with the scapula and cleithrum 
dorsally. The scapula is hollowed out medially to form a well marked canal between 
it and the mesocoracoid through which passed the dorso-medial muscles of the fin. 
The mesocoracoid is narrow, with a deep excavation mid-way along its posterior edge. 
The pectoral fin consists of at least 15 large, stout rays. Only the proximal parts 
of the rays are preserved and they are slightly flattened. 
sca 
A 20mm ' 
Fic. 12. Apateodus striatus Woodward. Part of the pectoral girdle of the left side in 
medial view. From the collection of the Institute of Geological Sciences, number 
26241. 
