210 



THE BOG-I'ISH 



Eia. 46. Scyllium canicula. The skull and visceral skeleton seen from 

 the ventral surface. The labial cartilages and gill-rays of the left 

 side have been removed, (a. m. m.) 



A, base of skull. SB, basi -branchial . BC I'g BC 5, first aud fifth cerato- 

 branchials. BE 1, BE 5. first and fifth epi-branchi^s. BH 1, first hypo- 

 branchial, represented as though seen through the cerato-hyal. BH 2, second 

 hypo-branchial. BP 1, BP 5, first and fiith pharyngo-brauchials. E, upper 

 jaw. BB 1, EB 2, EB 3, first, second, and third extra-brancMals, EL, liga- 

 ment connecting the two halves of the upper ]aw. P, lower jaw. EL, ligament 

 connecting the two halves of the lower jaw. G, gill-ray. HB, basi-hyal. 

 HC, cerato-hyal. HM, hyo -mandibular cartilage. L 1, L 2, labial caxtilages. 

 M", nasal cartilage. ITC, olfactory capsule. R, median bar of rostrum. BL, 

 lateral bar of rostrum. S, notch for Cuvieriau sinus. 



