DEVELOPMENT OF VASCULAft DENTINE. 
45 
l. Elastic ligament which attaches the Hake’s and Cod’s teeth. 
o. Odontoblasts. 
p. Formative dental pulp. 
p. Empty pulp chamber. 
cp. Capillary blood vessels. 
v. Artery entering pulp. 
The lettering is the same in all the figures. 
PLATE 3. 
Fig. 1. Anchylosed tooth, consisting of vaso-dentine tipped with enamel. Longi- 
tudinal section. Merlucius vulgaris (Hake). 
Fig. 2. Fragment of fresh Yaso-dentine from a Hake just caught, X 100. Capillary 
blood-vessels hang out from the edge of the dentine, and blood corpuscles are 
pouring out in abundance from one of the vessels. 
Fig 3. Portion of dentine of Hake between the vascular canals, X 600. Longi- 
tudinal section. The matrix is not homogeneous, but looks as though 
made up of coalesced globules rendered somewhat angular by mutual 
apposition. 
Fig. 4. Sections of dentine and surface of the pulp, the latter slightly dragged away 
from the former, X 100. Hake. 
Fig. 5. Three isolated odontoblast cells, X 500. Hake. 
Fig. 6. Surface of pulp, with thin layer of newly formed dentine, which tends to split 
up into rods, each one corresponding with an odontoblast cell, X 70. 
Hake. 
Fig. 7. A capillary vessel with adherent odontoblast, X 100. Hake, taken from sur- 
face of pulp. 
Fig. 8. Young tooth-sac, X 50. Hake. The largest enamel cells correspond in posi- 
tion to the future enamel cap. 
Fig. 9. Section of base of tooth and of the pulp. Cod ( Gadus morrhua). 
PLATE 4. 
Fig. 10. Tooth consisting of vaso-dentine, the place of the ordinary external layer of 
hard dentine being supplied by a layer of thick enamel, X 50. Ostracion. 
Fig. 10* Tooth of vaso-dentine with an apex of hard dentine, X 40. Flounder 
(Pleuronectes Jlesus). 
Fig. 10.’'" Tooth of hard dentine with base of vaso-dentine. Serrasalmo. 
