FINS 



35' 



The dermal pectoral girdle is generally remarkable for the 

 backward and inward prolongation of a styliform postclavicle deeply 



FIG. 333. 

 Head of Erythrichthys nitidus, Rich., with mouth protracted. (After Giinther.) 



embedded in the body-wall (Fig. 452). Almost always the radials of 

 the pectoral fin are reduced to three or four short radii and one very 



PIG. 334. 



Skeleton of the right half of pectoral girdle and right 

 fin of Fierasfer aevs, L. (After Emery.) c, coracoid ; clt, 

 cleithrum ; I, lepidotrich ; pr, ventral process ; ps.t, 

 post - temporal ; r, 5th radial ; s, scapula with small 

 foramen ; set, supraclavicle. The cartilage is dotted. 



Endoskeleton of the pectoral 

 girdle and fin of Malapterurus 

 clectricus. (After Sagemehl, from 

 Gegenbaur, Vergl. Anat. \\~irbel- 

 tiere.) N, scapular foramen ; A"i, 

 nerve foramen ; RI-H, radials ; Sch, 

 girdle ; Sp, mesocoracoid. 



small radial fixed to the base of the anterior dermotrich. There 

 may be a few distal nodules of cartilage. All trace of an axis has 

 vanished, and the radials appear to be all of preaxial origin. 



