PLATE 7 
EXPLANATION OF FIGURES 
All figures of Heterodontus francisci (three-fourths natural size). 
24 Lateral view of left side of first dorsal fin (female). 
25 Lateral view of left side of second dorsal fin (female). 
27 Dorsal view of left pelvic fin of male, showing skeleton of clasper. 
b. 1-2, first and second segments fol- 
lowing the basipterygium 
b.c., basal cartilage 
ba., basal piece 
ba.p., basipterygium 
B., beta cartilage 
d.mg., dorsal marginal 
clasper 
cartilage of 
d.tr. 1-2, first and second dorsal termi- 
nal cartilage of clasper 
pl., pelvic girdle 
ra., radial cartilage 
tr. 3, accessory terminal cartilage of 
clasper a Aas 
v.tr., ventral terminal cartilage of 
clasper 
490 
