Ferreira and Vooren: Age, growth, and structure of vertebra in Galeorhinus galeus 



23 



380 



JUN 



480 



JUL 



780 



SEP 



7(1 



SEP 



382 



JUL 



1083 



AUG 



383 



NOV 



484 

 JUN 



285 



JUN 



385 



JUL 



Figure 5 



Length-frequency distribution of male Galeorhinus galeus by 



750 ^ for readings of interior rings and from 50 to 100 

 jy. thick for readings on the margins. 



Pattern of vertebral calcification 



The vertebra of Galeorhinus galeus is composed of 

 calcified cartilage. Its centrum consists of a corpus 

 calcareum of two obtuse, hollow cones with their apices 

 joined and opposed. The space around the two cones 

 is organized into four oblique basalia and four calcified 



Figure 6 



Microradiograph of transverse section of Gateorhinus galeus 

 vertebra. 



Figure 7 



Sagittal section of Galeorhinus galeus vertebra under reflected 

 light with dark background. Translucent zones appear dark 

 and the opaque zones appear white. 



intermedialia: dorsal, ventral and lateral (Fig. 1) (Good- 

 rich 1958, Ridewood 1921). In transverse section 

 through the center of the centrum (focus), these radial 



